HTML
CSS
JavaScript
HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src='http://libs.itshubao.com/jquery/2.1.3/jquery.min.js'></script>
</head>
<body>

<h1>欢迎访问我的主页</h1>
<h2>IT书包</h2>
<div>IT书包专业收集常用代码、jquery插件、js特效。</div>
<p>笔下光年</p>
<p>小清新的 <span>小说阅读网站。</span></p>
</body>
</html>
CSS

  

  

    
JavaScript

    
$(document).ready(function(){
    $("h2,div,span").css("background-color","yellow");
});