localStorage加时间戳.html

<script>
  function LocalSTime() {
    this.time = ''
    this.exitTime = ''
  }
  LocalSTime.prototype.setItem = (key, value, exitTime) => {
    this.exitTime = exitTime;
    this.time = new Date().getTime();
    var dateCurrent = new Date().getTime()
    let obj = {
      date: dateCurrent,
      key: value
    }
    let exitdata = JSON.stringify(obj)
    if(!window.localStorage.getItem(key)) {
      window.localStorage.setItem(key, exitdata);
    }
  }
  LocalSTime.prototype.getItem = (key) => {
    let lsData = JSON.parse(localStorage.getItem(key))
    let getTime = lsData.date;
    let lsValue = lsData.key;
    let isExit = new Date().getTime() - getTime <= this.exitTime * 60 * 1000;
    if (isExit) {
      return window.localStorage.getItem(key)
    } else {
      window.localStorage.removeItem(key)
    }
  }
  var localS = new LocalSTime()
  localS.setItem('clock', 'true', .1)
  localS.getItem("clock")
</script>