vue3 keep-alive实现前进更新后退销毁

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所属分类:Web前端
摘要

想要实现前进更新后退销毁,核心在操作keep-alive的include。
具体做法就是当进入新页面时将页面name保存,再次进入就将它之后的name删除。
具体实现:
正常情况下页面是线性前进的:
A->B->C->D
include数组数据[A,B,C,D]
当再次进入C,就认为是D返回C
include数组数据[A,B,C]
D页面就被销毁了,从而实现了后退销毁

想要实现前进更新后退销毁,核心在操作keep-alive的include。
具体做法就是当进入新页面时将页面name保存,再次进入就将它之后的name删除。
具体实现:
正常情况下页面是线性前进的:
A->B->C->D
include数组数据[A,B,C,D]
当再次进入C,就认为是D返回C
include数组数据[A,B,C]
D页面就被销毁了,从而实现了后退销毁

使用vuex保存include数组

const keep = {     namespaced: true,     state: () => {         return {             include: [],         }     },     getters: {         include(state) {             return state.include         },     },     mutations: {         add(state, name) {             let b = false             let i = 0             for (; i < state.include.length; ++i) {                 let e = state.include[i]                 if (e == name) {                     b = true                     break                 }             }             if (!b) {                 state.include.push(name)             } else {                 state.include.splice(i + 1)             }         }     },     actions: {      } } export default keep 

在beforeEach中添加name

import store from "../store" router.beforeEach((to, from,next) => { // 页面name要和route 的name一样   store.commit("keep/add", to.name)   next() }) 

include使用

<template>   <router-view v-slot="{ Component }">     <keep-alive :include="includeList">       <component :is="Component" />     </keep-alive>   </router-view> </template> <script> export default {   computed: {     includeList() {       return this.$store.getters["keep/include"].join(",");     },   }, }; </script> 

当然还有页面循环跳转的情况,一般是详情页
A->A->A->A 或A->B->C->A->B->C
这种情况如果不需要保存页面,就用wacth监控$route变化 重新请求接口
如果需要保存页面,就用动态路由addRoute添加新的路由
A1->A2->A3->A4

import time from "../views/time" function copyObj(obj) {     if (typeof obj == "object") {         if (Array.isArray(obj)) {             let arr = [];             for (let item of obj) {                 arr.push(Object.assign(copyObj(item)));             }             return arr;         } else if (obj == null) {             return null;         } else {             let obj1 = {};             for (let index in obj) {                 obj1[index] = copyObj((obj[index]));             }             return obj1;         }     } else if (typeof obj == "function") {         return Object.assign(obj);     } else if (typeof obj == undefined) {         return undefined;     } else {         return obj;     } } window.pushTime = function () {     let t = new Date().getTime();     let path = `/time/${t}`;     // 深复制component     time = copyObj(time)     // component name要和route 的name一样     time.name = path     this.$router.addRoute({         path,         name: path,         component: time,     });     this.$router.push({         path,     }); } 

vue2用vue-navigation 非常好用