Implementing mobile phone text message button countdown based on JavaScript (super simple)_javascript skills

 /*
 120秒手机短信按钮倒计时
 */
 exports.sendmessage = function (name) {
  var second = 120;
  $(name).attr("disabled", true);
  var color = $(name).css('background-color');
  $(name).attr("style", "background-color : #c1c1c1");
  function update(num) {
   if (num == second) {
    $(name).attr("style", "background-color : "+color);
    $(name).text("获取验证码");
    $(name).attr("disabled", false);
   }
   else {
    var printnr = second - num;
    $(name).text(printnr + "秒后获取");
   }
  }
  function uupdate(i) {
   return function () {
    update(i);
   }
  }
  for (var i = 1; i <= second; i++) {
   setTimeout(uupdate(i), i * 1000);
  }
 }