fmpq.com
源代码：
点击运行
<!DOCTYPE html> <html> <head> <script src="https://apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"> </script> <script> $(document).ready(function(){ $("p").on("mouseover mouseout",function(){ $("p").toggleClass("intro"); }); }); </script> <style type="text/css"> .intro { font-size:150%; color:red; } </style> </head> <body> <p>Move the mouse pointer over this paragraph.</p> </body> </html>
运行结果