37.localstorge

const localStorage = (function () {
  let store = {}
  return {
    getItem: function (key) {
      return store[key] || null
    },
    setItem: function (key, val, time) {
      time = Number(time) || 0;
      store[key] = val.toString();
      if (time > 0) {
        this.timeOut(key, time);
      }
    },
    timeOut: function (key, time) {
      var timer = setTimeout(() => {
        this.removeItem(key);
        clearTimeout(timer)
      }, time);
    },
    removeItem: function (key) {
      delete store[key]
    },
    clear: function () {
      store = {}
    }
  }
})()
Object.defineProperty(window, 'localStorage2', {
  value: localStorage
})