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<!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(){ var x=0; $("p").click(function(event){ $("p").animate({fontSize:"+=5px"}); x++; if (x>=2) { $(this).unbind(event); } }); }); </script> </head> <body> <p style="font-size:20px;">点击这个 p 元素放大字体,字体只会放大两次。</p> </body> </html>