<!DOCTYPE html>
<html>
<head>
<style>
a:link {color:blue;}
a:visited {color:blue;}
a:hover {color:red;}
a:active {color:yellow;}
</style>
</head>
<body>
<p>将鼠标指针移动到这个链接上：<a href="//www.w3xue.com">w3xue.com</a></p>
</body>
</html>