vue短信验证性能优化如何写入localstorage中

<div class="mtui-cell__ft" @click="getCode">
   <button class="mtui-vcode-btn mtui-text-center" v-if="flag">获取短信</button>
   <button class="mtui-vcode-btn mtui-text-center" v-if="!flag">剩余{{second}}s</button>
</div>

 second: 60,
 flag: true,
 timer: null // 该变量是用来记录定时器的,防止点击的时候触发多个setInterval

getCode() {
   let that = this;
   if (that.flag) {
    that.flag = false;
    let interval = window.setInterval(function() {
     that.setStorage(that.second);
     if (that.second-- <= 0) {
      that.second = 60;
      that.flag = true;
      window.clearInterval(interval);
     }
    }, 1000);
   }
  }

　　　　　setStorage(parm) {
   localStorage.setItem("dalay", parm);
   localStorage.setItem("_time", new Date().getTime());
  },
  getStorage() {
   let localDelay = {};
   localDelay.delay = localStorage.getItem("dalay");
   localDelay.sec = localStorage.getItem("_time");
   return localDelay;
  }

judgeCode() {
   let that = this;
   let localDelay = that.getStorage();
   let secTime = parseInt(
    (new Date().getTime() - localDelay.sec) / 1000
   );
   console.log(localDelay);
   if (secTime > localDelay.delay) {
    that.flag = true;
    console.log("已过期");
   } else {
    that.flag = false;
    let _delay = localDelay.delay - secTime;
    that.second = _delay;
    that.timer = setInterval(function() {
     if (_delay > 1) {
      _delay--;
      that.setStorage(_delay);
      that.second = _delay;
      that.flag = false;
     } else {
　　　　　　　　　　　　　
　　　　　　　　　　　　　　// 此处赋值时为了让浏览器打开的时候,直接就显示剩余的时间
      that.flag = true;
      window.clearInterval(that.timer);
     }
    }, 1000);
   }
  }