<!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" />
<style>
.one{text-decoration:underline;}
.two{text-decoration:overline;}
.three{text-decoration:line-through;}
.four{text-decoration:underline line-through;}
</style>
<title>无标题文档</title>
</head>
<body>
<p class="one">设置下划线</p>
<p class="two">设置上划线</p>
<p class="three">设置删除线</p>
<p class="four">设置删除线加下划线</p>
</body>
</html>
效果图：