<!DOCTYPE html><html> <head> <meta charset="UTF-8"> <title>按钮倒数5秒后才能点击</title> </head> <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script> <body> <button type="button" id="test" disabled>点击</button> </body> <script type="text/javascript"> setTimeout(function(){ $("button[id='test']").removeAttr("disabled"); },5000) </script></html>