jQuery 发送验证码倒计时按钮

{ 
  wait:90,
 
   hsTime:function(that){
 
 if (this.wait == 0) { 
             $('#hsbtn').removeAttr("disabled").val('重发短信验证码'); 
 this.wait = 90; 
 } else { 
 var _this = this;
             $(that).attr("disabled", true).val('在'+_this.wait+'秒后点此重发');
             _this.wait--; 
             setTimeout(function() { 
                 _this.hsTime(that); 
 }, 1000) 
 } 
 },
}