created () {
    //-------- start (不知道有何缺点暂时) -------//
    //在页面加载时读取localStorage里的状态信息
    if (localStorage.getItem("store") ) {
      this.$store.replaceState(Object.assign({}, this.$store.state,JSON.parse(localStorage.getItem("store"))));
      localStorage.removeItem('store');
    }
 
    //在页面刷新时将vuex里的信息保存到localStorage里
    window.addEventListener("pagehide",()=>{
      localStorage.setItem("store",JSON.stringify(this.$store.state))
    })
    //------ end ------//
},