html 如下
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<link href="1.css" rel="stylesheet" type="text/css" id="css">
<title>Document</title>
</head>
<body>
<a href="#" onClick="change(1)">1.css 点击变白</a>
<a href="#" onClick="change(2)">2.css 点击变黑</a>
<script type="text/javascript">
function change(a){
var css=document.getElementById("css");
if (a==1)
css.setAttribute("href","1.css");
if (a==2)
css.setAttribute("href","2.css");
}
</script>
</body>
</html>
1css如下
body{background-color: #fff;color: #333;}
2css如下
body{background-color: red;color: #333;}