<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style type="text/css">
#div1 {
width: 100px;
height: 100px;
background: red;
}
</style>
<script>
function togreen(){
var green=document.getElementById('div1');
green.style.width='200px';
green.style.height='200px';
green.style.background='green';
}
function tored() {
var green=document.getElementById('div1');
green.style.width='100px';
green.style.height='100px';
green.style.background='red';
}
</script>
</head>
<body>
<div id="div1" onMouseOver="togreen()" onMouseOut="tored()">
</div>
</body>
</html>
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