前端短信验证码倒计时

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var btnSendCode = document.getElementById('btnSendCode') function getcode() {   let username = $("input[name=username]").val();   var loading = layer.load(1);   $.post("{:url('frontend/Sign/sendCode')}", { username: username }, function (response) {     layer.close(loading);     if (response.code != 1) {       layer.msg(response.msg, function () { });       return;     }     layer.msg(response.msg);     btnSendCode.setAttribute("disabled", true);     settime(60)   })   }

　　下面是倒计时的代码

  function settime(countdown) {
    if (countdown == 0) {
      btnSendCode.removeAttribute("disabled");
      btnSendCode.value = "获取验证码";
    } else {
      btnSendCode.setAttribute("disabled", true);
      btnSendCode.value = "重新发送(" + countdown + ")";
      countdown--;
    }
    setTimeout(function () {
      settime(countdown)
    }, 1000)
  }