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            <ul>
<li><h5 id="这篇是用-markdown-写的-建议下载一个markdown阅读器-typora-方便阅读。"><a href="#这篇是用-markdown-写的-建议下载一个markdown阅读器-typora-方便阅读。" class="headerlink" title="这篇是用 markdown 写的,建议下载一个markdown阅读器 typora,方便阅读。"></a>这篇是用 markdown 写的,建议下载一个markdown阅读器 <a href="https://typora.io/" target="_blank" rel="noopener">typora</a>,方便阅读。</h5></li>
<li><h5 id="公司前端项目基本都用的Vue全家桶"><a href="#公司前端项目基本都用的Vue全家桶" class="headerlink" title="公司前端项目基本都用的Vue全家桶:"></a>公司前端项目基本都用的Vue全家桶:</h5><ul>
<li>路由管理：<a href="https://router.vuejs.org/zh/" target="_blank" rel="noopener">Vue-Router</a>，官方文档写的很清晰。</li>
<li>数据请求：双控用的<a href="https://www.kancloud.cn/yunye/axios/234845" target="_blank" rel="noopener">Axios</a>、另外有一些项目用的 Vue-Resource。</li>
<li>状态管理：<a href="https://vuex.vuejs.org/zh/guide/" target="_blank" rel="noopener">Vuex</a>，目前只有双控项目用到了，官方文档教程写的很清晰，需要花费时间去学习。</li>
<li>UI框架使用的<a href="http://element-cn.eleme.io/#/zh-CN/component/tabs" target="_blank" rel="noopener">Element-UI</a>，注意老项目Element版本不同配置方法。</li>
<li>依赖包管理：基本用的是<a href="https://yarn.bootcss.com/docs/" target="_blank" rel="noopener">yarn</a>, 最好别和npm一起混用。</li>
<li>css预处理器:<a href="https://www.sass.hk/docs/" target="_blank" rel="noopener">sass</a>，sass可以做很多事情，变量、继承、函数、Mixin、运算、循环等、熟练了写起样式会很高效，官方文档教程也讲的很清晰。这是我收藏的几个CSS网站   <a href="https://css-tricks.com/" target="_blank" rel="noopener">css-tricks</a>  <a href="http://css3generator.com/" target="_blank" rel="noopener">css3-generator</a> <a href="http://gradient.awesomes.cn/" target="_blank" rel="noopener">gradient</a>  <a href="https://www.cssmatic.com/box-shadow" target="_blank" rel="noopener">box-shadow</a>，能够快速的生成一些好看的CSS效果。</li>
</ul>
</li>
<li><h5 id="可以学一下-ES6-语法，解构赋值、对象的-assign、-展开操作符-、属性名简洁表示、async-await-等一些经常会用到。有空的话可以了解下正则（JavaScript-正则表达式迷你书）-最近经常能用到。"><a href="#可以学一下-ES6-语法，解构赋值、对象的-assign、-展开操作符-、属性名简洁表示、async-await-等一些经常会用到。有空的话可以了解下正则（JavaScript-正则表达式迷你书）-最近经常能用到。" class="headerlink" title="可以学一下 ES6 语法，解构赋值、对象的 assign、 展开操作符 、属性名简洁表示、async await 等一些经常会用到。有空的话可以了解下正则（JavaScript 正则表达式迷你书）,最近经常能用到。"></a>可以学一下 <a href="http://es6.ruanyifeng.com/?search=%E5%B1%95%E5%BC%80&amp;x=0&amp;y=0#docs/destructuring" target="_blank" rel="noopener">ES6</a> 语法，解构赋值、对象的 assign、 展开操作符 、属性名简洁表示、async await 等一些经常会用到。有空的话可以了解下正则（<a href="https://github.com/qdlaoyao/js-regex-mini-book" target="_blank" rel="noopener">JavaScript 正则表达式迷你书</a>）,最近经常能用到。</h5></li>
<li><h5 id="下面的这些是我在刚开始学习Vue基础部分时做的笔记，整合删改了一些，又添加了一部分示例，基本涵盖了Vue基础知识，供参考，也可以直接看官方文档的教程。我学习Vue时主要也是通过官方文档，把基础部分过一遍，示例代码手敲自己运行一下，刚开始可以先不深究原理，先掌握基础用法，在项目中碰到看不懂的代码再去查阅文档或请教恒哥。"><a href="#下面的这些是我在刚开始学习Vue基础部分时做的笔记，整合删改了一些，又添加了一部分示例，基本涵盖了Vue基础知识，供参考，也可以直接看官方文档的教程。我学习Vue时主要也是通过官方文档，把基础部分过一遍，示例代码手敲自己运行一下，刚开始可以先不深究原理，先掌握基础用法，在项目中碰到看不懂的代码再去查阅文档或请教恒哥。" class="headerlink" title="下面的这些是我在刚开始学习Vue基础部分时做的笔记，整合删改了一些，又添加了一部分示例，基本涵盖了Vue基础知识，供参考，也可以直接看官方文档的教程。我学习Vue时主要也是通过官方文档，把基础部分过一遍，示例代码手敲自己运行一下，刚开始可以先不深究原理，先掌握基础用法，在项目中碰到看不懂的代码再去查阅文档或请教恒哥。"></a>下面的这些是我在刚开始学习Vue基础部分时做的笔记，整合删改了一些，又添加了一部分示例，基本涵盖了Vue基础知识，供参考，也可以直接看<a href="https://cn.vuejs.org/v2/guide/" target="_blank" rel="noopener">官方文档</a>的教程。我学习Vue时主要也是通过官方文档，把基础部分过一遍，示例代码手敲自己运行一下，刚开始可以先不深究原理，先掌握基础用法，在项目中碰到看不懂的代码再去查阅文档或请教恒哥。</h5></li>
</ul>
<hr>
<h1 id="Vue基础知识部分"><a href="#Vue基础知识部分" class="headerlink" title="Vue基础知识部分"></a>Vue基础知识部分</h1><h3 id="构造器"><a href="#构造器" class="headerlink" title="构造器"></a>构造器</h3><ul>
<li>实例化vue时，需传入一个选项对象，它可以包括 数据、模板、挂载元素、方法和生命周期钩子</li>
</ul>
<h3 id="属性与方法"><a href="#属性与方法" class="headerlink" title="属性与方法"></a>属性与方法</h3><ul>
<li>每个vue实例都会代理其data对象里所有的属性</li>
<li>vue实例暴露了一些有用的实例属性与方法，这些属性与方法都有前缀$，以便与代理的data属性区分</li>
</ul>
<h3 id="实例生命周期"><a href="#实例生命周期" class="headerlink" title="实例生命周期"></a>实例生命周期</h3><ul>
<li>created钩子——在实例被创建后被调用</li>
<li>mounted—-当编译好的HTML被挂载到对应的位置,这个操作完成后触发</li>
<li>updated—-当data中的数据改变,并且虚拟DOM重新渲染完成后触发</li>
<li>destroyed</li>
<li>概要: 钩子的this 指向调用它的实例</li>
</ul>
<h3 id="生命周期图示"><a href="#生命周期图示" class="headerlink" title="生命周期图示"></a>生命周期图示</h3><ul>
<li><a href="https://cn.vuejs.org/images/lifecycle.png" target="_blank" rel="noopener">https://cn.vuejs.org/images/lifecycle.png</a></li>
</ul>
<h3 id="插值"><a href="#插值" class="headerlink" title="插值"></a>插值</h3><ul>
<li>文本<ul>
<li>双大括号</li>
<li>v-text</li>
</ul>
</li>
<li>纯HTML<ul>
<li>v-html</li>
</ul>
</li>
<li>属性<ul>
<li>v-bind（大双括号不能在属性中使用，因此需使用v-bind）</li>
</ul>
</li>
<li>使用JavaScript表达式</li>
</ul>
<h3 id="指令"><a href="#指令" class="headerlink" title="指令"></a>指令</h3><ul>
<li><p>哪些指令?</p>
<ul>
<li>v-bind</li>
<li>v-on</li>
<li>v-if</li>
<li>v-for（特殊）</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">                       v-if  </span><br><span class="line"> &lt;div id=&quot;app&quot;&gt;</span><br><span class="line">  &lt;template v-if=&quot;ok===&apos;username&apos;&quot;&gt;</span><br><span class="line">  用户名: &lt;input type=&quot;text&quot; placeholder=&quot;请输入用户名&quot; key=&quot;name-input&quot;&gt;</span><br><span class="line">  &lt;/template&gt;</span><br><span class="line">  &lt;template v-else&gt;</span><br><span class="line"> 密码: &lt;input type=&quot;text&quot;  placeholder=&quot;请输入密码&quot; key=&quot;psd-input&quot;&gt;</span><br><span class="line">  &lt;/template&gt;</span><br><span class="line">  &lt;button @click=&quot;toggle&quot;&gt;点击切换类型&lt;/button&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line">new Vue(&#123;</span><br><span class="line">    el: &quot;#app&quot;,</span><br><span class="line">    data: &#123;</span><br><span class="line">      ok:&apos;username&apos;</span><br><span class="line">    &#125;,</span><br><span class="line">    methods: &#123;</span><br><span class="line">    toggle: function(todo)&#123;</span><br><span class="line">        if(this.ok===&apos;username&apos;)&#123;</span><br><span class="line">        this.ok = &apos;psd&apos;</span><br><span class="line">      &#125;else&#123;</span><br><span class="line">        this.ok = &apos;username&apos;;</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"> 					v-for</span><br><span class="line"> &lt;div id=&quot;app&quot;&gt;</span><br><span class="line">  &lt;ul&gt;</span><br><span class="line">    &lt;li v-for=&quot;item in items&quot;&gt;&#123;&#123;item&#125;&#125;&lt;/li&gt;</span><br><span class="line">  &lt;/ul&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line">new Vue(&#123;</span><br><span class="line">  el: &quot;#app&quot;,</span><br><span class="line">  data: &#123;</span><br><span class="line">  items:[&apos;a&apos;,&apos;b&apos;,&apos;c&apos;]</span><br><span class="line">  &#125;,</span><br><span class="line">  methods: &#123;</span><br><span class="line">    toggle: function(todo)&#123;</span><br><span class="line">        todo.done = !todo.done</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
</li>
<li><p>修饰符</p>
<ul>
<li>v-on<ul>
<li>.stop   阻止单击事件冒泡      <a v-on:click.stop="doThis"></a></li>
<li>.prevent  提交事件不再重载页面 </li>
<li>.capture  添加事件侦听器时使用时间捕获模式</li>
<li>.self  只当事件在该元素本身（而不是子元素）触发时触发回调</li>
<li>等等</li>
</ul>
</li>
</ul>
</li>
</ul>
<h3 id="过滤器"><a href="#过滤器" class="headerlink" title="过滤器"></a>过滤器</h3><ul>
<li><p>过滤器的目的是用于文本转换,转化成你想要的格式</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line">						filters</span><br><span class="line">&lt;div id=&quot;app&quot;&gt;</span><br><span class="line">     &lt;p&gt;&#123;&#123;message | changeChar&#125;&#125;&lt;/p&gt;</span><br><span class="line">    &lt;button @click=&quot;changeFirstChar&quot;&gt;改变&lt;/button&gt;</span><br><span class="line"> &lt;/div&gt;</span><br><span class="line"></span><br><span class="line">new Vue(&#123;</span><br><span class="line"> el: &quot;#app&quot;,</span><br><span class="line"> data: &#123;</span><br><span class="line">   message:&apos;nihao&apos;</span><br><span class="line"> &#125;,</span><br><span class="line"> methods: &#123;</span><br><span class="line">     changeFirstChar: function(todo)&#123;</span><br><span class="line">         this.message = &apos;good evening&apos;</span><br><span class="line">     &#125;</span><br><span class="line">   &#125;,</span><br><span class="line">   filters:&#123;</span><br><span class="line">     changeChar(value)&#123;</span><br><span class="line">             if(!value)&#123;</span><br><span class="line">         return &apos;&apos;;</span><br><span class="line">       &#125;else&#123;</span><br><span class="line">         return value.charAt(0).toUpperCase()+value.substring(1)</span><br><span class="line">       &#125;</span><br><span class="line">     &#125;</span><br><span class="line">   &#125;</span><br><span class="line"> &#125;)</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h3 id="缩写"><a href="#缩写" class="headerlink" title="缩写"></a>缩写</h3><ul>
<li><p>v-bind缩写</p>
<ul>
<li><p>原有： <a v-bind:href="url"></a>    </p>
<p>缩写： <a :href="url"></a></p>
</li>
</ul>
</li>
<li><p>v-on缩写</p>
<ul>
<li><p>原有：<button v-on:click="doSomeThing"></button> </p>
<p>缩写：<button @click="doSomeThing"></button></p>
</li>
</ul>
</li>
</ul>
<h2 id="计算属性"><a href="#计算属性" class="headerlink" title="计算属性"></a>计算属性</h2><h3 id="计算属性（减少模板的复杂度）"><a href="#计算属性（减少模板的复杂度）" class="headerlink" title="计算属性（减少模板的复杂度）"></a>计算属性（减少模板的复杂度）</h3><ul>
<li>计算属性的基础写法</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br></pre></td><td class="code"><pre><span class="line">						computed</span><br><span class="line">&lt;div id=&quot;app&quot;&gt;</span><br><span class="line">   &#123;&#123;fullName&#125;&#125;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line">new Vue(&#123;</span><br><span class="line">  el: &quot;#app&quot;,</span><br><span class="line">  data: &#123;</span><br><span class="line">  		firstName:&apos;wang&apos;,</span><br><span class="line">   	 	lastName:&apos;weiJiang&apos;</span><br><span class="line">  &#125;,</span><br><span class="line"> 	computed:&#123;</span><br><span class="line">  	fullName()&#123;</span><br><span class="line">    	return this.firstName+&apos;----&apos;+this.lastName;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<ul>
<li><p>计算缓存vs方法(Methods)</p>
<ul>
<li>计算属性computed具有缓存，而methods无缓存</li>
</ul>
</li>
<li><p>Computed属性vs 侦听器(Watch属性)</p>
<ul>
<li>watch方法–观察Vue实例上的数据变动,只要指定的数据改变就会执行预定的函数</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line">							watch</span><br><span class="line">&lt;div id=&quot;app&quot;&gt;</span><br><span class="line">    &#123;&#123;msg&#125;&#125; &lt;br&gt; </span><br><span class="line">    改变了吗? &#123;&#123;isChange&#125;&#125;</span><br><span class="line">    &lt;button @click=&quot;change&quot;&gt;改变&lt;/button&gt;</span><br><span class="line">&lt;/div&gt;</span><br><span class="line"></span><br><span class="line">new Vue(&#123;</span><br><span class="line">  el: &quot;#app&quot;,</span><br><span class="line">  data: &#123;</span><br><span class="line">        msg:&apos;111&apos;,</span><br><span class="line">      isChange:&apos;No&apos;</span><br><span class="line">  &#125;,</span><br><span class="line">    watch:&#123;</span><br><span class="line">    //只要msg改变,这个方法就会执行</span><br><span class="line">    msg(val,oldVal)&#123;</span><br><span class="line">        this.isChange = &apos;Yes&apos;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;,</span><br><span class="line">  methods:&#123;</span><br><span class="line">    change()&#123;</span><br><span class="line">        this.msg = &apos;222&apos;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<ul>
<li>computed方法</li>
</ul>
</li>
<li><p>计算setter 和getter</p>
<ul>
<li>get和set,顾名思义,一个是获得,一个是设置,常规上来讲,计算属性中都是有get和set方法的,默认是只有getter方法,如果需要的话,自然可以写一个setter方法.</li>
</ul>
</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line">						get和set</span><br><span class="line">&lt;div id=&quot;app&quot;&gt;</span><br><span class="line"> 此时的onpiece: &#123;&#123;onepiece&#125;&#125; &lt;br&gt;</span><br><span class="line"> 此时的msg:  &#123;&#123;msg&#125;&#125; &lt;br&gt;&lt;br&gt;</span><br><span class="line">  &lt;button @click=&quot;setName&quot;&gt;设置name&lt;/button&gt;</span><br><span class="line">&lt;/div&gt;		</span><br><span class="line"></span><br><span class="line">new Vue(&#123;</span><br><span class="line">  el: &quot;#app&quot;,</span><br><span class="line">  data: &#123;</span><br><span class="line">  	name:&apos;Kobe&apos;,</span><br><span class="line">    msg:&apos;&apos;</span><br><span class="line">  &#125;,</span><br><span class="line">  methods:&#123;</span><br><span class="line">  	setName()&#123;</span><br><span class="line">    	this.onepiece = &apos;james&apos;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;,</span><br><span class="line">  computed:&#123;</span><br><span class="line">  	onepiece:&#123;</span><br><span class="line">        get()&#123;</span><br><span class="line">          return this.name +&apos;Bryant&apos;;</span><br><span class="line">        &#125;,</span><br><span class="line">        set(newVal)&#123;</span><br><span class="line">          //当给onepiece设置值的时候set就就会调用</span><br><span class="line">          this.msg = newVal+&apos;is the greatest basketball player&apos;;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<h2 id="class与style绑定"><a href="#class与style绑定" class="headerlink" title="class与style绑定"></a>class与style绑定</h2><h3 id="绑定HTML-class"><a href="#绑定HTML-class" class="headerlink" title="绑定HTML class"></a>绑定HTML class</h3><ul>
<li><p>对象语法</p>
<ul>
<li>基本</li>
<li>在对象中传入多个class属性（其会与原有class共存）</li>
<li>直接传入对象</li>
<li>与计算属性一起使用（绑定返回对象的计算属性）</li>
</ul>
</li>
<li><p>数组语法</p>
<ul>
<li>简单例子</li>
<li>三元表达式</li>
<li>当有多个条件class时，可以在数组语法中使用对象语法</li>
</ul>
</li>
<li><p>用在组件上</p>
<ul>
<li>简单例子</li>
<li>绑定HTML class例子</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"> 		绑定class的几种方式</span><br><span class="line">.classC&#123;</span><br><span class="line">  color:red;</span><br><span class="line">&#125;</span><br><span class="line">.classD&#123;</span><br><span class="line">  font-weight:bold;</span><br><span class="line">&#125;</span><br><span class="line">.classE&#123;</span><br><span class="line">  font-size:20px;</span><br><span class="line">&#125;</span><br><span class="line">.classF&#123;</span><br><span class="line">  color:blue;</span><br><span class="line">&#125;</span><br><span class="line">.classM&#123;</span><br><span class="line">  display:block;</span><br><span class="line">&#125;</span><br><span class="line">.classN&#123;</span><br><span class="line">  display:none;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br></pre></td><td class="code"><pre><span class="line">&lt;div id=&quot;app&quot;&gt;</span><br><span class="line">  &lt;h2&gt;class属性绑定&lt;/h2&gt;</span><br><span class="line"> -------------------绑定变量-------------------------</span><br><span class="line"> &lt;div :class=&quot;&#123;classA:a,classB:b&#125;&quot;&gt;</span><br><span class="line">   绑定变量</span><br><span class="line"> &lt;/div&gt;</span><br><span class="line">  -------------------绑定对象-------------------------</span><br><span class="line"> &lt;div :class=&quot;styleObj&quot;&gt;</span><br><span class="line">   绑定对象</span><br><span class="line"> &lt;/div&gt;</span><br><span class="line">  -------------------绑定数组-------------------------</span><br><span class="line"> &lt;div :class=&quot;arrClass&quot;&gt;</span><br><span class="line">   绑定数组</span><br><span class="line"> &lt;/div&gt;</span><br><span class="line">   -------------------绑定三元运算符-------------------------</span><br><span class="line"> &lt;div :class=&quot;m==true?&apos;classM&apos;:&apos;classN&apos;&quot;&gt;</span><br><span class="line">   绑定变量</span><br><span class="line"> &lt;/div&gt;</span><br><span class="line">   &lt;button @click=&quot;toggle&quot;&gt;toggle&lt;/button&gt;</span><br><span class="line">&lt;/div&gt;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line">new Vue(&#123;</span><br><span class="line">  el: &quot;#app&quot;,</span><br><span class="line">  data: &#123;</span><br><span class="line">   a:true,</span><br><span class="line">   b:false,</span><br><span class="line">   styleObj:&#123;</span><br><span class="line">    classC:true,</span><br><span class="line">    classD:true</span><br><span class="line">   &#125;,</span><br><span class="line">   m:true,</span><br><span class="line">   arrClass:[&apos;classE&apos;,&apos;classF&apos;]</span><br><span class="line">  &#125;,</span><br><span class="line">  methods:&#123;</span><br><span class="line">    toggle()&#123;</span><br><span class="line">        this.m=!this.m;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<h3 id="绑定内联样式"><a href="#绑定内联样式" class="headerlink" title="绑定内联样式"></a>绑定内联样式</h3><ul>
<li>对象语法<ul>
<li>内联式对象语法</li>
<li>样式对象式对象语法（更推荐）</li>
</ul>
</li>
<li>数组语法</li>
<li>自动添加前缀<ul>
<li>v-bind:style 当需要特定的前缀时如transform，vue.js会自动添加</li>
</ul>
</li>
<li>多重值<ul>
<li>可以为一个属性添加多个值的数组，常用于含有多个前缀的情况</li>
</ul>
</li>
</ul>
<h2 id="条件渲染"><a href="#条件渲染" class="headerlink" title="条件渲染"></a>条件渲染</h2><h3 id="v-if（v-else）是真正的渲染"><a href="#v-if（v-else）是真正的渲染" class="headerlink" title="v-if（v-else）是真正的渲染"></a>v-if（v-else）是真正的渲染</h3><ul>
<li><p>template元素与v-if</p>
</li>
<li><p>v-else（需要紧跟在v-if后边）</p>
</li>
<li><p>v-else-if</p>
</li>
<li><p>用key管理可复用的元素</p>
<ul>
<li>例子：用户名和邮箱登录界面 如果有key就不会复用,可以把key去试一下,然后输入看一下效果</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line">&lt;div id=&quot;app&quot;&gt;</span><br><span class="line">     &lt;template v-if=&quot;ok===&apos;username&apos;&quot;&gt;</span><br><span class="line">         用户名: &lt;input type=&quot;text&quot; placeholder=&quot;请输入用户名&quot; key=&quot;name-input&quot;&gt;</span><br><span class="line">     &lt;/template&gt;</span><br><span class="line">     &lt;template v-else&gt;</span><br><span class="line">        密码: &lt;input type=&quot;text&quot;  placeholder=&quot;请输入密码&quot; key=&quot;psd-input&quot;&gt;</span><br><span class="line">     &lt;/template&gt;</span><br><span class="line">     &lt;button @click=&quot;toggle&quot;&gt;点击切换类型&lt;/button&gt;</span><br><span class="line">   &lt;/div&gt;</span><br><span class="line">   </span><br><span class="line">   new Vue(&#123;</span><br><span class="line">     el: &quot;#app&quot;,</span><br><span class="line">     data: &#123;</span><br><span class="line">      ok:&apos;username&apos;</span><br><span class="line">     &#125;,</span><br><span class="line">     methods: &#123;</span><br><span class="line">       toggle: function(todo)&#123;</span><br><span class="line">           if(this.ok===&apos;username&apos;)&#123;</span><br><span class="line">           this.ok = &apos;psd&apos;</span><br><span class="line">         &#125;else&#123;</span><br><span class="line">           this.ok = &apos;username&apos;;</span><br><span class="line">         &#125;</span><br><span class="line">       &#125;</span><br><span class="line">     &#125;</span><br><span class="line">   &#125;)</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h3 id="v-show（其只是简单的切换display属性）"><a href="#v-show（其只是简单的切换display属性）" class="headerlink" title="v-show（其只是简单的切换display属性）"></a>v-show（其只是简单的切换display属性）</h3><ul>
<li>v-show不支持template语法</li>
<li>v-show不支持v-else</li>
</ul>
<h3 id="v-if-VS-v-show"><a href="#v-if-VS-v-show" class="headerlink" title="v-if VS v-show"></a>v-if VS v-show</h3><ul>
<li>v-if<ul>
<li>当条件不成立时不会渲染</li>
<li>切换开销较大，适合不太可能变化的场景</li>
</ul>
</li>
<li>v-show<ul>
<li>无论成不成立都会渲染</li>
<li>首次渲染开销较大，但切换开销小，因此适合经常变化的场景</li>
</ul>
</li>
</ul>
<h2 id="列表渲染"><a href="#列表渲染" class="headerlink" title="列表渲染"></a>列表渲染</h2><h3 id="v-for"><a href="#v-for" class="headerlink" title="v-for"></a>v-for</h3><ul>
<li>基本用法<ul>
<li>简单例子</li>
<li>带有index参数</li>
<li>使用of 替代 in</li>
</ul>
</li>
<li>template v-for<ul>
<li>简单例子</li>
</ul>
</li>
<li>对象迭代 v-for<ul>
<li>基础用法</li>
<li>带其他参数用法</li>
</ul>
</li>
<li>整数迭代 v-for<ul>
<li>例子</li>
</ul>
</li>
<li>组件和v-for<br>包含所有类型的例子</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br></pre></td><td class="code"><pre><span class="line"> &lt;template&gt;</span><br><span class="line"> &lt;div id=&quot;app&quot;&gt;</span><br><span class="line">      &lt;hr&gt;</span><br><span class="line">      &lt;strong style=&quot;border:2px solid #ccc;&quot;&gt;遍历数组:&lt;/strong&gt;</span><br><span class="line">      &lt;ul&gt;</span><br><span class="line">        &lt;li v-for=&quot;item in items&quot; &gt;&#123;&#123;item&#125;&#125;&lt;/li&gt;</span><br><span class="line">      &lt;/ul&gt;</span><br><span class="line">       &lt;hr&gt;</span><br><span class="line">      &lt;strong style=&quot;border:2px solid #ccc;&quot;&gt;遍历对象数组:&lt;/strong&gt;</span><br><span class="line">      &lt;ul&gt;</span><br><span class="line">        &lt;li v-for=&quot;(item,index) in pers&quot;&gt;&#123;&#123;index&#125;&#125;--我是&#123;&#123;item.name&#125;&#125;,今年&#123;&#123;item.age&#125;&#125;岁&lt;/li&gt;</span><br><span class="line">      &lt;/ul&gt;</span><br><span class="line">         &lt;hr&gt;</span><br><span class="line">      &lt;strong style=&quot;border:2px solid #ccc;&quot;&gt;遍历对象:&lt;/strong&gt;</span><br><span class="line">      &lt;ul&gt;</span><br><span class="line">        &lt;li v-for=&quot;(value,key) in obj&quot;&gt;</span><br><span class="line">          key:&#123;&#123;key&#125;&#125; |</span><br><span class="line">          value:&#123;&#123;value&#125;&#125;</span><br><span class="line">        &lt;/li&gt;</span><br><span class="line">      &lt;/ul&gt;</span><br><span class="line">  &lt;/div&gt;</span><br><span class="line">  &lt;/template&gt;</span><br><span class="line"></span><br><span class="line">&lt;script&gt;</span><br><span class="line">  new Vue(&#123;</span><br><span class="line">      el: &quot;#app&quot;,</span><br><span class="line">      data: &#123;</span><br><span class="line">        isOK:&apos;true&apos;,</span><br><span class="line">            items:[&apos;香蕉&apos;,&apos;苹果&apos;,&apos;烤肉&apos;],</span><br><span class="line">        pers:[&#123;</span><br><span class="line">            name:&apos;Kobe&apos;,</span><br><span class="line">          age:&apos;40&apos;</span><br><span class="line">        &#125;,</span><br><span class="line">        &#123;</span><br><span class="line">            name:&apos;James&apos;,</span><br><span class="line">          age:&apos;38&apos;	</span><br><span class="line">        &#125;],</span><br><span class="line">        obj:&#123;</span><br><span class="line">            1:&apos;one&apos;,</span><br><span class="line">          2:&apos;two&apos;</span><br><span class="line">        &#125;</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;)</span><br><span class="line">   &lt;/script&gt;</span><br></pre></td></tr></table></figure>
<h3 id="key"><a href="#key" class="headerlink" title="key"></a>key</h3><ul>
<li><p>作用</p>
<ul>
<li>用v-for更新已渲染过的列表时，它默认采用的是“就地复用”的原则，也就是如果数据项顺序发生了改变，vue将不是移动DOM元素来匹配数据项的顺序，而是简单复用此处的元素。如果想跟踪每个节点的身份，从而重用或重新排列现有元素，可使用key。</li>
</ul>
</li>
<li><p>key有什么用,</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">&lt;div id=&quot;app&quot;&gt;</span><br><span class="line">  KEY: &lt;input type=&quot;text&quot; v-model=&quot;id&quot;&gt; VALUE: &lt;input type=&quot;text&quot; v-model=&quot;name&quot;&gt;</span><br><span class="line">  &lt;button @click=&quot;add&quot;&gt;添加&lt;/button&gt;</span><br><span class="line">  &lt;ul&gt;</span><br><span class="line">&lt;li v-for=&quot;item in list&quot; :key=&quot;item.id&quot;&gt; //此处你可以吧key去了,先勾选一条,在追加一条试一下,然后加上key,勾选一条追加一条再试一下,一目了然</span><br><span class="line">  &lt;input type=&quot;checkbox&quot; &gt;</span><br><span class="line">  &#123;&#123;item.id&#125;&#125;---&#123;&#123;item.name&#125;&#125;</span><br><span class="line">&lt;/li&gt;</span><br><span class="line">  &lt;/ul&gt;</span><br><span class="line">&lt;/div&gt;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">new Vue(&#123;</span><br><span class="line">  el: &quot;#app&quot;,</span><br><span class="line">  data: &#123;</span><br><span class="line">    id:&quot;&quot;,</span><br><span class="line">    name:&quot;&quot;,</span><br><span class="line">    list:[</span><br><span class="line">      &#123;id:1, name:&apos;李斯&apos;&#125;,</span><br><span class="line">      &#123;id:2, name:&apos;嬴政&apos;&#125;,</span><br><span class="line">      &#123;id:3, name:&apos;赵高&apos;&#125;,</span><br><span class="line">      &#123;id:4, name:&apos;韩非&apos;&#125;,</span><br><span class="line">      &#123;id:5, name:&apos;荀子&apos;&#125;,</span><br><span class="line">    ]</span><br><span class="line">  &#125;,</span><br><span class="line">  methods: &#123;</span><br><span class="line">  	add: function()&#123;</span><br><span class="line">    	this.list.unshift(&#123;id:this.id,name:this.name&#125;)</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;)</span><br></pre></td></tr></table></figure>
<p>因为加上key默认采取的就是就地复用策略<br>    <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### 数组更新检测</span><br><span class="line"></span><br><span class="line">- 变异方法（会改变原有数组）</span><br><span class="line"></span><br><span class="line">  - push（）</span><br><span class="line">  - pop（）</span><br><span class="line">  - shift（）</span><br><span class="line">  - unshift（）</span><br><span class="line">  - splice（）</span><br><span class="line">  - sort（）</span><br><span class="line">  - reverse（）</span><br><span class="line"></span><br><span class="line">- 重塑数组</span><br><span class="line"></span><br><span class="line">  - filter（）</span><br><span class="line">  - concat（）</span><br><span class="line">  - slice（）</span><br><span class="line"></span><br><span class="line">- 注意事项</span><br><span class="line">  利用索引直接设置一个项时，vue不能检测变动，如：vm.items[indexOfItem] = newValue</span><br><span class="line">   如果要设置某一项</span><br></pre></td></tr></table></figure></p>
<ul>
<li>Vue.set(example1.items, indexOfItem, newValue)</li>
<li><p>example1.items.splice(indexOfItem, 1, newValue)</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
</li>
</ul>
<div id="app"><br>  <button @click="setZF">设置第二项为张飞</button><br>  <button @click="setGY">设置第三项为关羽</button><br>  <ul><br>    <li v-for="item in list"><br>      <input type="checkbox"><br>      —<br>    </li><br>  </ul><br></div>

<p>var vmm = new Vue({<br>  el: “#app”,<br>  data: {<br>    id:””,<br>    name:””,<br>    list:[<br>      {id:1, name:’李斯’},<br>      {id:2, name:’嬴政’},<br>      {id:3, name:’赵高’},<br>      {id:4, name:’韩非’},<br>      {id:5, name:’荀子’},<br>    ]<br>  },<br>  methods: {<br>      setZF: function(){<br>        Vue.set(this.list,1,{id:2,name:’张飞’})<br>    },<br>    setGY:function(){<br>        this.list.splice(2,1,{id:3,name:’关羽’})<br>    }<br>  }<br>})</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
<ul>
<li>修改数组长度时，vue不能检测变动，如：vm.items.length = newLength</li>
<li>只能用example1.items.splice(newLength)</li>
</ul>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### 对于显示过滤/排序结果的两种方法</span><br><span class="line"></span><br><span class="line">- 过滤数组--计算属性computed例子</span><br><span class="line"></span><br><span class="line">- 过滤数组--方法methods例子</span><br></pre></td></tr></table></figure>
<pre><code>计算属性应用于过滤
</code></pre>  <div id="app"><br>    <br>  </div>

<p>  new Vue({<br>    el: “#app”,<br>    data: {<br>     nums:[1,2,3,4,5,6,7,8,9]<br>    },<br>   computed:{<br>           specialNum(){<br>          return this.nums.filter((item,index)=&gt;{<br>            return item%3==0;<br>        })<br>      }<br>   }<br>  })</p>
  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>
  <div id="app"><br>    <ul><br>      <li v-for="item in fil(numbers)"></li> //在v-for循环中直接嵌入方法<br>    </ul><br>  </div>

<p>  new Vue({<br>    el: “#app”,<br>    data: {<br>     numbers:[1,2,3,4,5,6,7,8,9]<br>    },<br>    methods:{<br>          fil(nums){<br>          return nums.filter((item,index)=&gt;{<br>                return item%3==0;<br>          })<br>      }<br>      }<br>  })</p>
  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">## 两个简单的事件处理器</span><br></pre></td></tr></table></figure>
<p>1</p>
<div id="app"><br> <button @click="num+=1">增加1</button><br> <br></div>

<hr>
<p>2 </p>
<div id="app"><br>  <button @click="sayHello">点击sayHello</button><br></div><br>new Vue({<br>  el: “#app”,<br>  methods: {<br>      sayHello: function(){<br>        alert(‘sayHello’)<br>    }<br>  }<br>})<br><br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### 内联处理器方法</span><br><span class="line"></span><br><span class="line">- 访问原生DOM事件的例子,如果click事件不传参数,就默认把原生DOM传递进去</span><br></pre></td></tr></table></figure><br><br>  <div id="app"> //没有传参数,就是原生的!!!<br>   <button @click="showBtnname">显示按钮的名字</button> <br><br><br>     <br>  </div>

<p>  new Vue({<br>    el: “#app”,<br>    data: {<br>        msg:’’<br>    },<br>    methods: {<br>        showBtnname: function(e){<br>          this.msg = e.target.innerText;<br>      }<br>    }<br>  })</p>
  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 未访问原生DOM事件的例子,如果传了参数.那么方法中接受的第一个参数就是该参数,在vue中所有的事件绑定都是这样的</span><br></pre></td></tr></table></figure>
<p>  —————————-html———————————<br>  <div id="app"><br>    <h2>Todos:</h2><br>    <ol><br>      <li v-for="todo in todos"><br>        <label><br>          <input type="checkbox" v-on:change="toggle(todo)" v-bind:checked="todo.done"></label></li></ol></div></p>
<pre><code>      &lt;del v-if=&quot;todo.done&quot;&gt;
        {{ todo.text }}
      &lt;/del&gt;
      &lt;span v-else&gt;
        {{ todo.text }}
      &lt;/span&gt;
    &lt;/label&gt;
  &lt;/li&gt;
&lt;/ol&gt;
</code></pre><p>  <br>  —————————-js———————————<br>  new Vue({<br>    el: “#app”,<br>    data: {<br>      todos: [<br>        { text: “Learn JavaScript”, done: false },<br>        { text: “Learn Vue”, done: false },<br>        { text: “Play around in JSFiddle”, done: true },<br>        { text: “Build something awesome”, done: true }<br>      ]<br>    },<br>    methods: {<br>        toggle: function(todo){<br>          todo.done = !todo.done<br>      }<br>    }<br>  })<br>  —————————-css———————————<br>  body {<br>    background: #20262E;<br>    padding: 20px;<br>    font-family: Helvetica;<br>  }</p>
<p>  #app {<br>    background: #fff;<br>    border-radius: 4px;<br>    padding: 20px;<br>    transition: all 0.2s;<br>  }</p>
<p>  li {<br>    margin: 8px 0;<br>  }</p>
<p>  h2 {<br>    font-weight: bold;<br>    margin-bottom: 15px;<br>  }</p>
<p>  del {<br>    color: rgba(0, 0, 0, 0.3);<br>  }</p>
  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### 事件修饰符</span><br><span class="line"></span><br><span class="line">- .stop</span><br><span class="line">  - 阻止单击事件冒泡</span><br><span class="line">- .prevent</span><br><span class="line">  - 提交事件不再重载页面</span><br><span class="line">- .capture</span><br><span class="line">  - 使用事件捕获模式</span><br><span class="line">- .self</span><br><span class="line">  - 只有当事件在该元素本身被触发时（不包含子元素）才触发回调</span><br><span class="line">- .once</span><br><span class="line">  - 事件只触发一次（vue 2.1.4新增）</span><br><span class="line">- 修饰符串联</span><br><span class="line">  - 例子</span><br><span class="line"></span><br><span class="line">### 按键修饰符</span><br><span class="line"></span><br><span class="line">- .enter</span><br><span class="line"></span><br><span class="line">  - keyCode</span><br><span class="line">  - .enter</span><br><span class="line"></span><br><span class="line">- .tab</span><br><span class="line"></span><br><span class="line">- .delete</span><br><span class="line"></span><br><span class="line">  - (捕获 “删除” 和 “退格” 键)</span><br><span class="line"></span><br><span class="line">- .esc</span><br><span class="line"></span><br><span class="line">- .space</span><br><span class="line"></span><br><span class="line">- .up</span><br><span class="line"></span><br><span class="line">- .down</span><br><span class="line"></span><br><span class="line">- .left</span><br><span class="line"></span><br><span class="line">- .right</span><br><span class="line"></span><br><span class="line">- 组合使用,单独是使用的话,和click都是一样的,这里组合使用有点特殊,使用  .  进行连接简单给个例子</span><br></pre></td></tr></table></figure>
  <div id="app"><br>  <button @click.ctrl="num++">num+1</button><br>  <br>  </div>

<p>  new Vue({<br>    el: “#app”,<br>    data: {<br>        num:0<br>    }<br>  })</p>
  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### vue2.1.0新增 按键修饰符</span><br><span class="line"></span><br><span class="line">- .ctrl</span><br><span class="line">- .alt</span><br><span class="line">- .shift</span><br><span class="line">- .meta</span><br><span class="line"></span><br><span class="line">## 表单控件绑定</span><br><span class="line"></span><br><span class="line">### 基础用法</span><br><span class="line"></span><br><span class="line">- 文本</span><br></pre></td></tr></table></figure>
  <div id="app"><br>    <h2></h2><br>    <br><br>    <input type="text" v-model="msg"><br>  </div>

<p>  new Vue({<br>    el: “#app”,<br>    data: {<br>     msg:’万年的msg’<br>    }<br>  })</p>
  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 多行文本---在文本区域插值( `&lt;textarea&gt;&lt;/textarea&gt;` ) 并不会生效，应用 `v-model` 来代替</span><br></pre></td></tr></table></figure>
  <div id="app"><br>  <p style="white-space: pre"><br>    <br>  </p><br>    <br><br>    <textarea type="text" v-model="msg"></textarea><br>  </div>

  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 复选框</span><br><span class="line"></span><br><span class="line">  - 单个复选框(直接绑定true,false)</span><br></pre></td></tr></table></figure>
<pre><code>&lt;div id=&quot;app&quot;&gt;
&lt;input type=&quot;checkbox&quot; id=&quot;checkbox&quot; v-model=&quot;checked&quot;&gt;
&lt;label for=&quot;checkbox&quot;&gt;{{ checked }}&lt;/label&gt;
&lt;/div&gt;

new Vue({
  el: &quot;#app&quot;,
  data: {
   checked:true
  }
})

<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 多个复选框(将选中的所有value绑定到一个数组)</span><br></pre></td></tr></table></figure>

&lt;div id=&quot;app&quot;&gt;
    &lt;input type=&quot;checkbox&quot; id=&quot;jack&quot; value=&quot;Jack&quot; v-model=&quot;checkedNames&quot;&gt;
    &lt;label for=&quot;jack&quot;&gt;Jack&lt;/label&gt;
    &lt;input type=&quot;checkbox&quot; id=&quot;john&quot; value=&quot;John&quot; v-model=&quot;checkedNames&quot;&gt;
    &lt;label for=&quot;john&quot;&gt;John&lt;/label&gt;
    &lt;input type=&quot;checkbox&quot; id=&quot;mike&quot; value=&quot;Mike&quot; v-model=&quot;checkedNames&quot;&gt;
    &lt;label for=&quot;mike&quot;&gt;Mike&lt;/label&gt;
    &lt;br&gt;
    {{checkedNames}}
&lt;/div&gt;

new Vue({
  el: &quot;#app&quot;,
  data: {
    checkedNames:[]
  }
})

<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 单选按钮(绑定选中的单选框的value)</span><br></pre></td></tr></table></figure>
</code></pre>  <div id="app"><br>  <input type="radio" id="one" value="One" v-model="picked"><br>  <label for="one">One</label><br>  <br><br>  <input type="radio" id="two" value="Two" v-model="picked"><br>  <label for="two">Two</label><br>  <br><br>  <span>Picked: </span><br>  </div>

<p>  new Vue({<br>    el: “#app”,<br>    data: {<br>      picked:’’<br>    }<br>  })</p>
  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 选择列表(不管是单选还是多选,v-model都要绑定到select元素上)</span><br><span class="line"></span><br><span class="line">  - 单选列表(绑定到被选中项的value)</span><br></pre></td></tr></table></figure>
<pre><code>&lt;div id=&quot;app&quot;&gt;
    &lt;select v-model=&quot;selected&quot;&gt;
      &lt;option&gt;A&lt;/option&gt;
      &lt;option&gt;B&lt;/option&gt;
      &lt;option&gt;C&lt;/option&gt;
    &lt;/select&gt;
    &lt;span&gt;Selected: {{ selected }}&lt;/span&gt;
&lt;/div&gt;

new Vue({
  el: &quot;#app&quot;,
  data: {
    selected:&apos;&apos;
  }
})

<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 多选列表(绑定一个数组,数组的内容是所有的选中项的value)</span><br></pre></td></tr></table></figure>

&lt;div id=&quot;app&quot;&gt;
&lt;select v-model=&quot;selected&quot; multiple&gt;
  &lt;option&gt;A&lt;/option&gt;
  &lt;option&gt;B&lt;/option&gt;
  &lt;option&gt;C&lt;/option&gt;
&lt;/select&gt;
&lt;br&gt;
&lt;span&gt;Selected: {{ selected }}&lt;/span&gt;
&lt;/div&gt;

new Vue({
  el: &quot;#app&quot;,
  data: {
    selected: []
  }
})

<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 动态选项</span><br></pre></td></tr></table></figure>

&lt;div id=&quot;app&quot;&gt;
&lt;select v-model=&quot;selected&quot;&gt;
  &lt;option v-for=&quot;option in options&quot; v-bind:value=&quot;option.value&quot;&gt;
    {{ option.text }}
  &lt;/option&gt;
&lt;/select&gt;
&lt;span&gt;Selected: {{ selected }}&lt;/span&gt;
&lt;/div&gt;

new Vue({
  el: &quot;#app&quot;,
  data: {
         selected: &apos;A&apos;,
    options: [
      { text: &apos;One&apos;, value: &apos;A&apos; },
      { text: &apos;Two&apos;, value: &apos;B&apos; },
      { text: &apos;Three&apos;, value: &apos;C&apos; }
    ]
  }
})

<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### 修饰符</span><br><span class="line"></span><br><span class="line">- .lazy</span><br><span class="line"></span><br><span class="line">  - 由原有的input事件变更为change事件</span><br></pre></td></tr></table></figure>

&lt;div id=&quot;app&quot;&gt;
  &lt;input type=&quot;text&quot; v-model.lazy=&quot;msg&quot;&gt;
  {{msg}}
&lt;/div&gt;

new Vue({
  el: &quot;#app&quot;,
  data: {
    msg:&apos;万年的msg&apos;
  }
})


<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- .number</span><br><span class="line"></span><br><span class="line">  - 将输入的类型转换成数字类型（NaN则还是原有类型）</span><br><span class="line"></span><br><span class="line">- .trim</span><br><span class="line"></span><br><span class="line">  - 去除两端空白</span><br><span class="line"></span><br><span class="line">      </span><br><span class="line"></span><br><span class="line">### v-model与组件</span><br><span class="line"></span><br><span class="line">## 组件</span><br><span class="line"></span><br><span class="line">### 使用组件</span><br><span class="line"></span><br><span class="line">- 注册</span><br><span class="line"></span><br><span class="line">  - 注意事项</span><br><span class="line"></span><br><span class="line">    - 在初始化根实例前一定要确保注册了组件！！！！</span><br><span class="line">    - 名称最好 小写（可以使用短杆）</span><br></pre></td></tr></table></figure>

&lt;div id=&quot;app&quot;&gt;
  &lt;my-comp&gt;&lt;/my-comp&gt;
&lt;/div&gt;


Vue.component(&apos;my-comp&apos;,{
    template:&apos;&lt;h3&gt;我是新出炉的组件&lt;/h3&gt;&apos;
})
new Vue({
  el: &quot;#app&quot;,
  data: {

  }
})


<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 局部注册</span><br></pre></td></tr></table></figure>
</code></pre>  <div id="app"><br>    <my-comp></my-comp><br>  </div>

<p>  new Vue({<br>    el: “#app”,<br>    components:{<br>        ‘my-comp’:{template:’</p><h3>我是新出炉的组件</h3>‘}<br>    },<br>    data: {<p></p>
<pre><code>}
</code></pre><p>  })</p>
  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- DOM模板解析说明</span><br><span class="line"></span><br><span class="line">  - 自定义组件在这些元素内受限</span><br><span class="line"></span><br><span class="line">    - ul</span><br><span class="line"></span><br><span class="line">    - ol</span><br><span class="line"></span><br><span class="line">    - table</span><br><span class="line"></span><br><span class="line">    - select</span><br><span class="line"></span><br><span class="line">    - 概要: 解决方案是 使用 特殊的is属性</span><br></pre></td></tr></table></figure>
<pre><code>  &lt;div id=&quot;app&quot;&gt;
   &lt;table&gt;
     &lt;tr&gt;
     &lt;my-comp&gt;&lt;/my-comp&gt;//注意:这样写是绝对错误的,因为tr中只允许有td,这样写他是不认识滴
     &lt;/tr&gt;
   &lt;/table&gt;
  &lt;/div&gt;
  xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx 上边是错误的


  ---------------------------------下边是正确的-----------------------------------
  &lt;div id=&quot;app&quot;&gt;
   &lt;table&gt;
     &lt;tr&gt;
       &lt;td is=&quot;my-comp&quot;&gt;&lt;/td&gt;
     &lt;/tr&gt;
   &lt;/table&gt;
  &lt;/div&gt;

  new Vue({
    el: &quot;#app&quot;,
    components:{
        &apos;my-comp&apos;:{
              template:&apos;&lt;td&gt;我是组件td&lt;/td&gt;&apos;
      }
    },
    data: {

    }
  })


  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 不受限的情况--使用字符串模板</span><br><span class="line"></span><br><span class="line">  - &lt;script type=&quot;text/x-template&quot;&gt;  怎么用呢?给大家来个例子吧!</span><br></pre></td></tr></table></figure>

  -------------------------------HTML-----------------------------------------
  &lt;div id=&quot;app&quot;&gt;
   &lt;table&gt;
     &lt;tr&gt;
     &lt;template&gt;
         &lt;my-comp&gt;&lt;/my-comp&gt;
     &lt;/template&gt;
     &lt;/tr&gt;
   &lt;/table&gt;
  &lt;/div&gt;

  &lt;script type=&quot;text/x-template&quot; id=&quot;myComponent&quot;&gt;
              &lt;td&gt;This is a component!&lt;/td&gt;
  &lt;/script&gt;

  -----------------------------------JS----------------------------------
  new Vue({
    el: &quot;#app&quot;,
    components:{
        &apos;my-comp&apos;:{
              template:&apos;#myComponent&apos;
      }
    },
    data: {

    }
  })


  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- JavaScript内联模板字符串(什么是字符串模板)</span><br></pre></td></tr></table></figure>

  &lt;div id=&quot;app&quot;&gt;
   &lt;table&gt;
     &lt;tr&gt;
     &lt;template&gt;  //这个就是字符串模板
         &lt;my-comp&gt;&lt;/my-comp&gt;
     &lt;/template&gt;
     &lt;/tr&gt;
   &lt;/table&gt;
  &lt;/div&gt;


  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">  - .vue组件  (第三种)</span><br><span class="line"></span><br><span class="line">- data必须是函数,在组件中使用data中定义的数据,必须使用函数返回,我自己的理解,最根本的三个字就是作用域,目的就是为了防止组件中使用的data和vue实例中的data进行相互污染,</span><br></pre></td></tr></table></figure>

&lt;div id=&quot;app&quot;&gt;
&lt;mycomp&gt;&lt;/mycomp&gt;
&lt;/div&gt;

new Vue({
  el: &quot;#app&quot;,
  components:{
      &apos;mycomp&apos;:{
            template:&apos;&lt;button&gt;{{btncount}}&lt;/button&gt;&apos;,
       data(){
          return {btncount:8}
        }
    }
  },
  data:{
      btncount:10
  }
})


<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">### Prop（子组件从父组件获得数据）</span><br><span class="line"></span><br><span class="line">- 使用prop传递数据</span><br></pre></td></tr></table></figure>

&lt;div id=&quot;app&quot;&gt;
    &lt;child msg=&quot;我是来自于父组件的内容&quot;&gt;&lt;/child&gt;
&lt;/div&gt;

new Vue({
  el: &quot;#app&quot;,
  components:{
      &apos;child&apos;:{
        props:[&apos;msg&apos;],
        template:&apos;&lt;h2&gt;{{msg}}&lt;/h2&gt;&apos;
    }
  }
})


<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"></span><br></pre></td></tr></table></figure>

          动态绑定父组件中的数据
  &lt;div id=&quot;app&quot;&gt;
    &lt;input type=&quot;text&quot; v-model=&quot;fathertext&quot;&gt;
        {{fathertext}}
    &lt;child :childText=&quot;fathertext&quot;&gt;&lt;/child&gt;
  &lt;/div&gt;

  new Vue({
    el: &quot;#app&quot;,
    components:{
        &apos;child&apos;:{
          props:[&apos;childtext&apos;],
          template:&apos;&lt;h1&gt;{{childtext}}&lt;/h1&gt;&apos;
      }
    },
    data: {
        fathertext:&apos;&apos;
    }
  })


<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">  - </span><br><span class="line"></span><br><span class="line">  - props注意事项</span><br><span class="line"></span><br><span class="line">    - 一般情况下是数组形式，如果要想规定props的数据类型（后面用中括号 [ ]）。默认值等（props验证），则是对象了（后面用花括号  &#123;  &#125;）</span><br><span class="line"></span><br><span class="line">- 关于命名:要不然全小写,要不然kebabCase（驼峰式),kebab-case（短横线隔开式）Vue 能够正确识别出小驼峰和下划线命名法混用的变量，如这里的`forChildMsg`和`for-child-msg`是同一值。 </span><br><span class="line"></span><br><span class="line">- 动态Prop（使用v-bind）:在模板中，要动态地绑定父组件的数据到子组件模板的 props，和绑定 Html 标签特性一样，使用v-bind绑定 </span><br><span class="line"></span><br><span class="line">  - 局部注册组件</span><br><span class="line">  - 全局注册组件</span><br><span class="line"></span><br><span class="line">- 字面量语法vs动态语法</span><br><span class="line"></span><br><span class="line">- 单向数据流</span><br><span class="line"></span><br><span class="line">  - 解释</span><br><span class="line"></span><br><span class="line">    - 父组件数据更新后，子组件的所有prop都会更新为最新值，但是反过来就不会。（注意 ：如果prop为数组或对象时，子组件改变prop，父组件的状态也会受到影响，因为数组或对象是引用类型，他们指向同一个内存空间。）如果子组件的prop值被修改，则vue会给出警告。</span><br></pre></td></tr></table></figure>

  &lt;div id=&quot;app&quot;&gt;
  &lt;parent&gt;&lt;/parent&gt;
  &lt;/div&gt;

  let childNode = {
   template: `
       &lt;div class=&quot;child&quot;&gt;
        &lt;div&gt;
         &lt;span&gt;子组件数据&lt;/span&gt;
         &lt;input v-model=&quot;forChildMsg&quot;/&gt;
        &lt;/div&gt;
        &lt;p&gt;{{forChildMsg}}&lt;/p&gt;
       &lt;/div&gt;`,
   props: {
    &quot;for-child-msg&quot;: String
   }
  };
  let parentNode = {
   template: `
       &lt;div class=&quot;parent&quot;&gt;
        &lt;div&gt;
         &lt;span&gt;父组件数据&lt;/span&gt;
         &lt;input v-model=&quot;msg&quot;/&gt;
        &lt;/div&gt;
        &lt;p&gt;{{msg}}&lt;/p&gt;
        &lt;child :for-child-msg=&quot;msg&quot;&gt;&lt;/child&gt;
       &lt;/div&gt;
      `,
   components: {
    child: childNode
   },
   data() {
    return {
     msg: &quot;default string.&quot;
    };
   }
  };

  new Vue({
    el: &quot;#app&quot;,
    components:{
        parent:parentNode
    }
  })


  <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- 特殊情况应对方法</span><br><span class="line"></span><br><span class="line">  - prop作为初始值传入后，可能子组件想把它当做局部数据来用的情况</span><br><span class="line"></span><br><span class="line">    - 方法：定义一个局部变量，并用prop的值初始化它</span><br></pre></td></tr></table></figure>

    props: [&apos;initialCounter&apos;],
    data: function () {
      return { counter: this.initialCounter }
    }
    //直接使用counter作为子组件的局部变量就可以了


    <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- prop作为初始值传入，可能子组件处理成其他数据输出的情况,比如处理成去空格并大写</span><br><span class="line"></span><br><span class="line">  - 方法：定义一个计算属性，处理prop的值并返回</span><br></pre></td></tr></table></figure>

    props: [&apos;size&apos;],
    computed: {
      normalizedSize: function () {
        return this.size.trim().toLowerCase()
      }
    }


    <figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">- prop验证</span><br><span class="line"></span><br><span class="line">  - 例子</span><br></pre></td></tr></table></figure>

Vue.component(&apos;example&apos;, {