换样式
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>改变div的样式</title>
<style type="text/css">
#div1{
width:100px;height:100px;background:red;
}
</style>
<script type="text/javascript">
function toGreen(){
var oDiv1=document.getElementById('div1');
oDiv1.style.width='200px';
oDiv1.style.height='200px';
oDiv1.style.background='green';
}
function toRed(){
var oDiv1=document.getElementById('div1');
oDiv1.style.width='100px';
oDiv1.style.height='100px';
oDiv1.style.background='red';
}
</script>
</head>
<body>
<div id="div1" onmouseover="toGreen()"onmouseout="toRed()"></div>
</body>
</html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>改变div的样式</title>
<style type="text/css">
#div1{
width:100px;height:100px;background:red;
}
</style>
<script type="text/javascript">
function toGreen(){
var oDiv1=document.getElementById('div1');
oDiv1.style.width='200px';
oDiv1.style.height='200px';
oDiv1.style.background='green';
}
function toRed(){
var oDiv1=document.getElementById('div1');
oDiv1.style.width='100px';
oDiv1.style.height='100px';
oDiv1.style.background='red';
}
</script>
</head>
<body>
<div id="div1" onmouseover="toGreen()"onmouseout="toRed()"></div>
</body>
</html>