keep alive实现前进更新后退销毁
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。
具体实现思路：
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
立即学习“前端免费学习笔记（深入）”；
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
