vue監聽瀏覽器刷新

  mounted() {
    window.addEventListener('beforeunload', e => this.beforeunloadHandler(e))
  },

　　

  methods: {
    beforeunloadHandler (e) {
      e = e || window.event
      if (e) {
        e.returnValue = '關閉提示'
      }
      window.sessionStorage.setItem('a',1)
      return '關閉提示'
    },
}

　　

  destroyed () {
    window.removeEventListener('beforeunload', e => this.beforeunloadHandler(e))
  }