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javascript之setTimeout定时器

2016-06-08 11:41 393 查看

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
* { margin:0px; padding:0px;}
#qq {width:200px; height:400px; background-color:#BB8687; margin-top:10px; margin-left:10px;}
#title {width:180px; height:200px; background-color:#6FE1EF; position:absolute; left:220px; top:10px; display:none;}
</style>
<script>
window.onload = function(){
var qq = document.getElementById('qq');
var title = document.getElementById('title');

qq.onmouseover = block;
qq.onmouseout = none;

title.onmouseover = block;
title.onmouseout = none;

etime = null;

function block(){
clearTimeout( etime )
title.style.display = 'block';
}
function none(){
etime = setTimeout(function(){
title.style.display = 'none';
},500);
}
}
</script>
</head>
<body>
<div id="qq"></div>
<div id="title"></div>
</body>
</html>

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