缓存id路由页面返回，历史路由栈

功能需求

网页端需要做页面数据缓存（vue动态路由数据缓存），可根据id值打开多个编辑详情页，需要在页面操作返回时关闭面包屑页签

隐藏问题

1.页面缓存会有初始化和组件激活访问生命周期调用数据接口过多，有性能损耗
2.使用this.$router.back()返回是返回上一个历史路由，如果打开多个id详情页，并反复在两个详情页做切换操作，会导致在操作返回时看起来像是在详情页反复切换数据关闭不了，如下图

解决

1.缓存页组件初始化（created）和组件激活访问（activated）生命周期只执行一次，使用变量状态，在进入方法时判断变量是否return，在接口完成（finally）更改变量

2.路由历史栈，在路由守卫router.beforeEach对store存储from历史路由，在标题组件返回方法里，对历史路由栈数据进行操作，获取历史有效路由使用this.$router.replace跳转

javascript 复制代码

//在面包屑页签组件初始化时调用addTags方法存储访问路由
addTags() {
  const { name } = this.$route
  if (name) {
    this.$store.dispatch('tagsView/addView', this.$route)
  }
},


//在权限管理路由守卫里存储历史访问路由
import store from './store'
router.beforeEach(async (to, from, next) => {
  ...
  store.commit('tagsView/ADD_ROUTER_HISTORY', from.path);
  ...
}

tagsView.js文件

javascript 复制代码

const state = {
  visitedViews: [],
  cachedViews: [],
  routeHistory: [],
  closedRoutes: [],
  validHistory:[],
  lastValidRoute:''
}
const mutations = {
  ADD_ROUTER_HISTORY: (state, path) => {
    state.routeHistory.push(path);
  },
  CLOSE_ROUTER(state, route) {
    state.closedRoutes.push(route);
    // 生成过滤后的有效历史栈
    state.validHistory = state.routeHistory.filter(item => !state.closedRoutes.includes(item))

    if (state.cachedViews.length===0) {
      //首页
      state.lastValidRoute = '/'  
    }else{
      //历史有效路由
      state.lastValidRoute = state.validHistory[state.validHistory.length - 1];  
    }
  },
  ADD_VISITED_VIEW: (state, view) => {
    if (state.visitedViews.some(v => v.path === view.path)) return
    state.visitedViews.push(
      Object.assign({}, view, {
        title: view.meta.title || 'no-name'
      })
    )
  },
  ADD_CACHED_VIEW: (state, view) => {
    if (state.cachedViews.includes(view.name)) return
    if (!view.meta.noCache) {
      state.cachedViews.push(view.name)
    }
    console.log(state.cachedViews)
  }
}
const actions = {
  addView({ dispatch }, view) {
    dispatch('addVisitedView', view)
    dispatch('addCachedView', view)
  },
  addVisitedView({ commit }, view) {
    commit('ADD_VISITED_VIEW', view)
  },
  addCachedView({ commit }, view) {
    commit('ADD_CACHED_VIEW', view)
  },
  delView({ dispatch, state }, view) {
    return new Promise(resolve => {
      dispatch('delVisitedView', view)
      dispatch('delCachedView', view)
      resolve({
        visitedViews: [...state.visitedViews],
        cachedViews: [...state.cachedViews],
      })
    })
  },
  delVisitedView({ commit, state }, view) {
    return new Promise(resolve => {
      commit('DEL_VISITED_VIEW', view)
      resolve([...state.visitedViews])
    })
  },
  delCachedView({ commit, state }, view) {
    return new Promise(resolve => {
      commit('DEL_CACHED_VIEW', view)
      resolve([...state.cachedViews])
    })
  }
}
export default {
  namespaced: true,
  state,
  mutations,
  actions
}

标题组件layout-header.vue文件返回方法里应用

html 复制代码

<template>
  <div class="layout-header">
    <div class="back" v-if="back" @click="handleBack">
      <img src="@/assets/images/back-icon.png"/>
    </div>
    <div class="layout-title" :style="'font-size:' + fontSize + 'px' ">{{title}}</div>
    <slot></slot>
  </div>
</template>

javascript 复制代码

<script>
export default {
  props: {
    title: {
      type: String,
      default: ""
    },
    back: {
      type: Boolean,
      default: false
    },
    fontSize: {
      type: Number,
      default: 18
    }
  },
  data() {
    return {

    }
  },
  methods: {
    handleBack(){
      let path = this.$route.path
      //存入当前路由
      this.$store.commit('tagsView/ADD_ROUTER_HISTORY', path);
      const visitedViews=this.$store.state.tagsView.visitedViews
      let view = visitedViews.find(v => v.path === path)
      //计算路由历史栈及访问路由
      this.$store.commit('tagsView/CLOSE_ROUTER', path);
      this.$store.dispatch('tagsView/delView', view)
      // 获取最近有效路由并跳转
      const target = this.$store.state.tagsView.lastValidRoute
      this.$router.replace(`${target}`);
    }
  }
}
</script>