练习:鼠标感应伸缩隐藏层
鼠标感应伸缩隐藏层，实际上我没完全理解这个例子，但是相信以后会用的到，所以先把code贴上来，未来我要去理解的两个参数方法setInterval() ，clearInterval()，目前还不是很清楚这两个的用法 。如果有谁会欢迎留言解答，不胜感激。
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
div{width:200px;word-break:break-all;border:1px solid red;overflow:hidden; cursor:pointer}
</style>
<script type="text/javascript">
var t = true;
var obj,a;
function openclose(openclose){
var h = obj.offsetHeight;
h += openclose*5;
if(h>=150){
clearInterval(a);
obj.style.height = "150px";
t = true;
}
else if(h<=50){
clearInterval(a);
obj.style.height = "50px";
t = true;
}
else obj.style.height = h + "px";
}
function getlink(){
obj.onmouseout = function(){
clearInterval(a);
a = setInterval("openclose(-1)" , 5);
}
obj.onmouseover = function(){
clearInterval(a);
a = setInterval("openclose(1)" , 5);
}
}
window.onload = function()
{
obj = document.getElementById("box")
obj.style.height = "50px";
getlink();
}
</script>
</head>
<body>
<div id="box">
<img src="http://www.phpstudy.net/images/logo.gif">
</div>
</body>
</html>
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