html模态弹出层简单实现例子

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模态框就是弹出后，在其取消掉前不再允许操作其他窗口。下面是一个简单的js实现的模态框例子。

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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<style>
#mask {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	background: rgba(0,0,0,0.2);
	display: none;
}
#diag {
	background-color: pink;
	width: 200px;
	height: 100px;
	position: fixed;
	left: 50%;
	top: 30%;
	display: none;
}
#close {
	position: absolute;
	top: 5px;
	right: 5px;
}
</style>
<title>实现模态弹出框</title>
</head>
<body>
<button id="btn_diag">弹出</button>
<button id="btn_test">测试</button>
<div id="mask">
</div>
<div id="diag">
	<div id="close">X</div>
</div>
</body>
<script>
window.onload = function() {
	var btn_diag = document.getElementById('btn_diag');
	var btn_test = document.getElementById('btn_test');
	var diag = document.getElementById('diag');
	var mask = document.getElementById('mask');
	var close = document.getElementById('close');
	btn_diag.onclick = function() {
		mask.style.display = 'block';
		diag.style.display = 'block';
	}
	btn_test.onclick = function() {
		alert(btn_test.innerText);
	}
	close.onclick = function() {
		mask.style.display = 'none';
		diag.style.display = 'none';
	}
}
</script>
</html>