js延時提示框

<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>延時提示框</title>
	<style>
		div{
			float: left;
			margin: 10px;
		}
		#div1{
			width: 50px;
			height: 50px;
			background: red;
		}
		#div2{
			width: 400px;
			height: 180px;
			background: #ccc;
			display: none;
		}
	</style>
</head>
<body>
	<div id="div1"></div>
	<div id="div2"></div>
</body>
<script type="text/javascript">
window.onload = function () {
	var oDiv1 = document.getElementById('div1');
	var oDiv2 = document.getElementById('div2');
	var timer = null;

	oDiv2.onmouseover = oDiv1.onmouseover = function(){
		clearTimeout(timer);
		oDiv2.style.display = 'block';
	};
	oDiv2.onmouseout = oDiv1.onmouseout = function(){
		timer = setTimeout(function(){
			oDiv2.style.display = 'none';
		},500);
	};
}
</script>
</html>

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