ife-js-task/task29.html at master · glt18/ife-js-task · GitHub

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<!DOCTYPE html>
<html>
<head>
	<title>Task 29</title>
	<meta charset="utf-8">
	<style type="text/css">
		body {
			padding-top: 20%;
			width: 50%;
			height: 100%;
			margin: 0 auto;
		}
		span {
			padding-left: 10%;
			display: inline-block;
			width: 10%;
			font-size: 24px;
			color: #696969;
		}
		input {
			width: 50%;
			height: 50px;
			border:2px solid #00FFFF;
			border-radius: 25px;
			outline: none;
			font-size: 18px;
		}
		button {
			width: 10%;
			height: 50px;
			border:2px solid #98Fb98;
			border-radius: 25px;
			background-color: #98Fb98;
			font-size: 18px;
			color: #708090;
			outline: none;
		}
		div {
			width: 50%;
			margin: 0 auto;
			font-size: 18px;
			color: #696969;
			margin-top: 1%;
		}
	</style>
</head>
<body>
	<span>名称</span>
	<input type="text" id="text">
	<button id="btn" onclick="test()">验证</button>
	<div id="remind">必填，长度为4~16个字符</div>
	<script type="text/javascript">
		var text = document.getElementById('text');
		var button = document.getElementById('btn');
		var remind = document.getElementById('remind');
		function test () {
			var charLength = getLength();
			if (charLength >=4 && charLength <= 16) {
				remind.innerHTML = "格式正确";
				remind.style.color = "#00FF00";
			}  else if(charLength < 4) {
				remind.innerHTML = "字符数小于4！";
				remind.style.color = "#FF6347";
			}  else {
				remind.innerHTML = "字符数大于16！";
				remind.style.color = "#FF6347";
			}
		}
		function getLength() {
			var length = 0;
			var testText = text.value;
			for(var i = 0 ; i < testText.length ; i++) {
				charCode = testText.charCodeAt(i);
				if (charCode >=0 &&charCode <= 128) {
					length += 1;
				}  else {
					length += 2;
				}
			}
			return length;
		}
	</script>
</body>
</html>