jQuery案例 - W3xue在线HTML/CSS/JS运行工具

​x
 
<html>
<head>
<script type="text/javascript" src="/js/jquery.js"></script>
<script type="text/javascript">
$(document).ready(function(){
  $("button").click(function(){
    $('ul li').toggleClass(function(){
      return 'listitem_' + $(this).index();
    });
  });
});
</script>
<style type="text/css">
.listitem_1, .listitem_3
{
color:red;
}
.listitem_0, .listitem_2
{
color:blue;
}
</style>
</head>
​
<body>
<h1 id="h1">This is a heading</h1>
<ul>
<li>Apple</li>
<li>IBM</li>
<li>Microsoft</li>
<li>Google</li>
</ul>
<button class="btn1">添加或移除列表项的类</button>
</body>
</html>
​