<!doctype html> <html> <head> <meta charset="utf-8"> <title>jQuery实现倒计时重新发送短信验证码功能示例-jq22.com</title> <script src="http://libs.baidu.com/jquery/1.11.3/jquery.min.js"></script> <style> </style> </head> <body> <input type="button" id="btn" value="免费获取验证码" onclick="settime(this)"><script> var countdown=60; function settime(obj) { if (countdown == 0) { obj.removeAttribute("disabled"); obj.value="免费获取验证码"; countdown = 60; return; } else { obj.setAttribute("disabled", true); obj.value="重新发送(" + countdown + ")"; countdown--; } setTimeout(function() { settime(obj) } ,1000) }</script> </body> </html>