今天写了个动态切换样式文件，感觉比我之前做的那个好多了哦。

页面代码：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<link rel="stylesheet" href="red.css" id="lf"/></link>
</head>
<script>
function abc(obj)
{
    var linkfile=document.getElementById('lf');
    var c=obj.selectedIndex;
    if(c==1) linkfile.href='red.css';
    else if(c==2) linkfile.href='green.css';
    else linkfile.href='yellow.css';
}
</script>
<body>
<div></div>
<select id="selCss" onchange="abc(this)">
    <option value="0">请选择颜色</option>
    <option value="1">红色</option>
    <option value="2">绿色</option>
    <option value="3">黄色</option>
</select>
</body>
</html>