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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
#div1 {
position: relative;
width: 200px;
height: 50px;
background-color: red;
overflow: hidden;
}
#div2 {
position: relative;
width: 200px;
height: 150px;
top: 50px;
background-color: blue;
}
#div3 {
position: relative;
width: 200px;
height: 50px;
background-color: green;
}
#div4 {
position: relative;
width: 200px;
height: 50px;
background-color: blue;
}
#div5 {
position: relative;
width: 200px;
height: 50px;
background-color: black;
}
</style>
</head>
<body>
<div id="div1">
<div id="div2">
<div id="div3"></div>
<div id="div4"></div>
<div id="div5"></div>
</div>
</div>
<script type="text/javascript">
var odiv1 = document.getElementById("div1");
odiv1.onmouseover = function () {
odiv1.style.overflow = "visible";
odiv1.style.backgroundColor = "yellow";
}
odiv1.onmouseout = function () {
odiv1.style.overflow = "hidden";
odiv1.style.backgroundColor = "red";
}
var odiv3 = document.getElementById("div3");
odiv3.onmouseover = function () {
odiv3.style.backgroundColor = "red";
}
odiv3.onmouseout = function () {
odiv3.style.backgroundColor = "green";
}
var odiv4 = document.getElementById("div4");
odiv4.onmouseover = function () {
odiv4.style.backgroundColor = "white";
}
odiv4.onmouseout = function () {
odiv4.style.backgroundColor = "blue";
}
var odiv5 = document.getElementById("div5");
odiv5.onmouseover = function () {
odiv5.style.backgroundColor = "yellowgreen";
}
odiv5.onmouseout = function () {
odiv5.style.backgroundColor = "black";
}
</script>
</body>
</html>
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原文地址：http://www.cnblogs.com/songfengyao/p/5639402.html
