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

//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.$routeif (name) {this.$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

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)) returnstate.visitedViews.push(Object.assign({}, view, {title: view.meta.title || 'no-name'}))},ADD_CACHED_VIEW: (state, view) => {if (state.cachedViews.includes(view.name)) returnif (!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

<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>

<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.$store.state.tagsView.visitedViewslet view = visitedViews.find(v => v.path === path)//计算路由历史栈及访问路由this.$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.lastValidRoutethis.$router.replace(`${target}`);}}
}
</script>