test/form.html at master · xiangss/test · GitHub

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<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script>
// var box = document.querySelector('.box');
// console.log(box);//null

window.onload = function (){//页面加载完成时触发（html, css, js , 图片，音视频等资源加载完成才执行）
    var box = document.querySelector('.box');
    console.log(box);
}

</script>
</head>
<body>

<!-- key=value -->
<!-- https://www.baidu.com/?username=xiaocuo&password=123456&sex=1 -->
<form action="https://www.baidu.com/" method="get">
    账号：<input type="text" name="username"><br/>
    密码：<input type="text" name="password"><br/>
    性别：<select name="sex">
        <option value="0">女</option>
        <option value="1">男</option>
        <option value="2">未知</option>
    </select><br/>
    <input type="submit" value="注册">
</form>

<div class="box">一个坑</div>
<img class="pic" src="http://pic39.photophoto.cn/20160411/1155116845138548_b.jpg" alt="">


<script>
// dom节点渲染完成
var form = document.querySelector('form');

form.onsubmit = function (){
    alert('注册成功');
}

var pic = document.querySelector('.pic');
pic.onload = function (){
    alert('图片加载完成');
}

</script>
</body>
</html>