时间：2021-07-01 10:21:17 帮助过：45人阅读
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3c.org/TG/xhtml/DTD/xhtml-transitional.dtd">
<html>
<head>
<title>changeColor.html</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<link rel="stylesheet" type="text/css" href="http://www.php1.cn/"> <script type="text/javascript">
function changeColor(eventObj){
//获得css中的所有选择器
var cssset = document.styleSheets[0].rules;
//从css中获取所需要的选择器
var style1=cssset[0];
if(eventObj.value=="黑色"){
style1.style.backgroundColor="black";
}else if(eventObj.value=="红色"){
style1.style.backgroundColor="red";
}
}
</script>
</head>
<body>
<div class="style1"></div>
<input type="button" value="黑色" onclick="changeColor(this);">
<input type="button" value="红色" onclick="changeColor(this);">
</body>
</html>
css代码：
.style1{
width: 600px;
height: 400px;
background-color: black;
}