Edit The Code:
See Result »
Try it Yourself - ©
w3big.com
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>本教程(w3big.com)</title> <script src="http://cdn.static.w3big.com/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ $("p").removeClass("intro"); }); }); </script> <style type="text/css"> .intro{ font-size:120%; color:red; } </style> </head> <body> <h1>这是一个标题</h1> <p class="intro">这是一个段落。</p> <p class="intro">这是另一个段落。</p> <button>移除所有P元素的"intro"类</button> </body> </html>