vue页面出去时vux存页面高度,再进来时回到原来高度

        //html文件
created(){


},
beforeRouteLeave(to, from, next) { //从这个页面出去的时候执行这里
    try {
      let top = document.documentElement.scrollTop || document.body.scrollTop; // 得到当前高
      let scrolldata = {
        url: "/Pushtwopage", //记录哪个页面
        scrollTop: top, //记录滚动条高度
        shop: this.shop,
        shopTypeName: this.shopTypeName,
      };
      this.$store.commit("set_scrollPostions", scrolldata); //把要存的存到set_scrollPostions里
    } catch (err) {}
    next();
},
mounted() {
var url = window.location.pathname; //获取一下页面url的后面一截
    url = "/Pushtwopage";
    var scrolls = this.$store.state.scrollPostions; //把vux存的数据拿出来
    var scrollTop = 0;
    this.shop.data = [];
    for (let i = 0; i < scrolls.length; i++) {
      if (scrolls[i].url == url) {
        scrollTop = scrolls[i].scrollTop;
        this.shop = scrolls[i].shop;
        this.shopTypeName = scrolls[i].shopTypeName;
        break;
      }
    }
    setTimeout(function() {
      scroll(0, scrollTop);
    }, 10);


},




//store.js文件
import Vue from 'vue'
import Vuex from 'vuex'
import Qs from 'qs'


Vue.use(Vuex)


const state = {
    user:{},
    token:'',
    addrdata:[],
    scrollPostions:[],
    triplist:[],
    catchMap:new Map(),
}


const mutations = {
  set_user (state, user) {
    state.user = user
  },
  set_token (state, token) {
    state.token = token
  },
  set_addrdata(state,data){
    state.addrdata=data
  },
  set_tripList(state,data){
    state.triplist=data
  },
  set_scrollPostions (state, currscrollPostion) {
    for(let i=0;i<state.scrollPostions.length;i++){
        if(state.scrollPostions[i].url==currscrollPostion.url){
          state.scrollPostions[i]=currscrollPostion;
          return;
        }
    }
    state.scrollPostions.push(currscrollPostion);
  }
}


export default new Vuex.Store({
  state,
  mutations
})