JavaScript实现短信倒计时60s

$(function(){
 //获取验证码
 var getCode = document.getElementById('getCode');
 var wait = 60;
 function time(btn){
 if (wait===0) {
 btn.removeAttribute("disabled");
 btn.innerHTML = "获取验证码";
 wait = 60;
 }else{
 btn.setAttribute("disabled",true);
 btn.innerHTML = wait + "秒后重试";
 wait--;
 setTimeout(function(){
 time(btn);
 },1000);
 }
 }
 getCode.onclick = function(){
 time(this);
 };
})