<!DOCTYPE html> <html> <head> <title>60秒倒计时</title> <script type="text/javascript"> window.onload=function(){ var oBtn = document.getElementById(‘but‘); var conut = 60; var timer = null; oBtn.onclick=function(){ timer=setInterval(function(){ settime() },1000) } function settime(){ if(conut == 0){ oBtn.value = ‘免费获取验证码‘; oBtn.removeAttribute("disabled"); clearInterval(timer); conut=60; }else{ conut --; oBtn.value = conut +‘后可以重发‘; oBtn.setAttribute("disabled", true); } } } </script> </head> <body> <input type="button" value="免费获取验证码" id="but"> </body> </html>
原文：http://www.cnblogs.com/heboliufengjie/p/4476431.html