JavaScript实现短信验证码60秒倒计时功能

$(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);
    };
})