vue中keep-alive,include的缓存问题

时间:2022-12-21 13:50:46

前提:有A,B,C,D四个页面,A是按钮页(点击按钮进入B页面),B是订单列表页,C是订单详情页,D是费用详情页

需求:顺序是A->B->C->D,每次都刷新页面,D->C->B时走缓存,但是每次从A到B都要刷新B页面,从B到C需要刷新C页面,从C到D要刷新D页面

在vue官方文档2.1以上有include 和 exclude 属性允许组件有条件地缓存。在这里主要用include结合vuex来实现(四个页面组件都有自己的name才会生效,这里name就叫A,B,C,D)

从D->C,从C->B,从B->A 可以写一个公共的头部返回组件,统一使用 this.$router.go(-1)返回前一页

App.vue


<template> <div class="app"> <keep-alive :include="keepAlive" > <router-view/> </keep-alive> </div> </template> <script type='text/javascript'> export default { data () { return {} }, computed: { keepAlive () { return this.$store.getters.keepAlive } } } </script>

store.js

import Vue from 'vue'
import Vuex from 'vuex'

Vue.use(Vuex)

export default new Vuex.Store({
  state: {
    keepAlive: []
  },
  mutations: {
    SET_KEEP_ALIVE: (state, keepAlive) => {
      state.keepAlive = keepAlive
    }
  },
  getters: {
    keepAlive: state => state.keepAlive
  }
})

每次进入B页面时先初始化 keepAlive(设置要走缓存的页面)

A.vue

<script>
    export default {
        name: 'A',
        methods: {
            buttonClick () {
                this.$store.commit('SET_KEEP_ALIVE', ['B', 'C', 'D']) 
          this.$router.push('/B')
       }
     }
  }
</script>

B.vue 该页面用来设置缓存和清除缓存

<script>
    export default {
        name: 'B',
        beforeRouteEnter (to, from, next) {
            next(vm => {
               if (from.path.indexOf('C') > -1) {
                    vm.$store.commit('SET_KEEP_ALIVE', ['B'])
               }
            })
        },
        beforeRouteLeave (to, from, next) {
            if (to.path.indexOf('C') > -1) {
               this.$store.commit('SET_KEEP_ALIVE', ['B', 'C'])
            } else if (to.path.indexOf('A') > -1) {
         this.$store.commit('SET_KEEP_ALIVE', []) 
} next() }  }
</script>

到这里就实现了需求

 

 

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