60秒倒计时js

var wait=4; 
 function time(o) { 
 if (wait == 0) { 
 o.removeAttribute(“disabled”); 
 o.innerHTML=”获取验证码”; 
 wait = 4; 
 } else { // www.jbxue.com 
 o.setAttribute(“disabled”, true); 
 o.innerHTML=”重新发送(” + wait + “)”; 
 wait–; 
 setTimeout(function() { 
 time(o) 
 }, 
 1000) 
 } 
 }document.getElementById(“getCaptcha”).οnclick=function(){time(this);}