<html><head><script type="text/javascript" src="/jquery/jquery.js"></script><script type="text/javascript">$(document).ready(function(){ $("div").click(function() { $(this).css( "width", function(index, value) {return parseFloat(value) * 1.2;} ); });});</script><style>div {width:100px; height:50px; background-color:red;}</style></head><body><div>请点击这里</div></body></html>