一、场景
最近做重构，有一个功能是，鼠标点击链接后显示不同样式：
代码如下，样式布局我修改后如下，使用bootstrap框架来做。
<!DOCTYPE html><html lang="zh-CN"><head> <meta charset="utf-8" /> <link href="css/bootstrap.min.css" rel="stylesheet"> <title>starof test</title> <style type="text/css">.menu{border-radius:4px;background-color:#f8f8f8;padding:10px;margin-top:30px;}.menu p{font-size:26px;margin-bottom:25px;color:#76caea;padding-left:30px;margin-top:15px;}.menu .nav-pills > li > a:hover{background-color:#8fd4e6;}/*page1.html页面定义*/.menu01{background-color:#5dc1d1;border-radius:4px;}/*page2.html页面定义*//*.menu02{background-color:#5dc1d1;border-radius:4px;}*//*page3.html页面定义*//*.menu03{background-color:#5dc1d1;border-radius:4px;}*/ </style></head><body><div class="col-md-2 menu"> <p> <span class="glyphicon glyphicon-user"></span> <span>starof</span> </p> <ul class="nav nav-pills nav-stacked"> <li class="menu01"><a href="page1.html">page1</a></li> <li class="menu02"><a href="page2.html">page2</a></li> <li class="menu03"><a href="page3.html">page3</a></li> </ul></div></body></html> 现在重点说一下：功能实现。
原来代码是这样实现链接点击样式的，给每个链接不同的class，
<li class="menu01"><a href="page1.html">page1</a></li><li class="menu02"><a href="page2.html">page2</a></li><li class="menu03"><a href="page3.html">page3</a></li>
然后在page1.html页面定义：
.menu01{background-color:#5dc1d1;border-radius:4px;} 同理在page2.html页面定义：
.menu02{background-color:#5dc1d1;border-radius:4px;} 在page3.html页面定义：
.menu03{background-color:#5dc1d1;border-radius:4px;} menu菜单这个模块是page1.html，page2.html，page3.html三个页面公共模块，通过include来共享。这样在调用不同页面时，其他链接的样式不生效。所以可以实现被点击的链接显示不同样式的效果。
但是这样的做法是非常糟糕的。同一个样式有多少个页面就重写多少次，不同class名称对应的却是同样的样式。
这样的代码我是无法忍受的。下面用一小段js来实现同样功能。
二、用js重构代码如下：
<!DOCTYPE html><html lang="zh-CN"><head> <meta charset="utf-8" /> <link href="css/bootstrap.min.css" rel="stylesheet"> <title>starof test</title> <style type="text/css">.menu{border-radius:4px;background-color:#f8f8f8;padding:10px;margin-top:30px;}.menu p{font-size:26px;margin-bottom:25px;color:#76caea;padding-left:30px;margin-top:15px;}/*下面这样写是为了提高选择器的优先级*/.menu .nav-pills > li > a:hover{background-color:#8fd4e6;}.clickstyle{background-color:#5dc1d1;border-radius:4px;} </style></head><body><div class="col-md-2 menu"> <p> <span class="glyphicon glyphicon-user"></span> <span>starof</span> </p> <ul class="nav nav-pills nav-stacked"> <li><a href="#">page1</a></li> <li><a href="#">page2</a></li> <li><a href="#">page3</a></li> </ul></div><script type="text/javascript"> var oLis=document.getElementsByTagName("li"); var i,j; var length=oLis.length; for(i=0;i<length;i++){ oLis[i].onclick=function(){ for(j=0;j<length;j++){ oLis[j].className=""; } this.className+="clickstyle"; } }</script></body></html> 三、类似的效果 实现方式如下：通过判断用户请求的url和是哪个，就给哪个添加active样式。
<div class="btn-toolbar"> <div class="btn-group"> {% url "addpermissionurl" as theaddpermissionurl %} <a class="btn btn-default {%if request.path = theaddpermissionurl%} active {%endif%}" href={{ theaddpermissionurl }}><span class="glyphicon glyphicon-edit"></span>新建权限</a> {% url "listpermissionurl" as thelistpermissionurl %} <a class="btn btn-default {%if request.path = thelistpermissionurl%} active {%endif%}" href={{ thelistpermissionurl }}><span class="glyphicon glyphicon-list"></span>权限列表</a> </div> </div>
本文作者starof,因知识本身在变化，作者也在不断学习成长，文章内容也不定时更新，为避免误导读者，方便追根溯源，请诸位转载注明出处：有问题欢迎与我讨论，共同进步。
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