vue项目keepAlive配合vuex动态设置路由缓存方式
短信预约 -IT技能 免费直播动态提醒
需求
首页 → 列表页→ 详情页（缓存列表页面 ） → 列表页（不重新加载列表页）→ 首页（清除列表页的缓存）
效果图
解决方案
直接使用keepAlive会出现一个问题，当从查询1进入列表页面，这时缓存list组件，然后返回首页，点击查询2，会发现list的数据是查询1的，因为这里直接调用了上一次的缓存因此，在返回首页后需清除list的缓存，下次进入list将重新初始化。
利用keepAlive进行路由缓存，keepAlive的include 和 exclude 属性允许组件有条件地缓存。
配合vuex维护一个缓存数组即可，不多BB，直接上代码
1.App.vue文件
利用include属性进行选择性缓存
<template>
<div style="height: 100%;">
<keep-alive :include="$store.state.common.cachedRouteNames">
<router-view />
</keep-alive>
</div>
</template><script>
export default {
name: 'App'
};
</script>2.main.js文件
配置路由keepAlive状态
import Vue from 'vue';
// import Vue from 'vue/dist/vue.esm.js'
import App from '../class="lazy" data-src/App.vue';
import router from '../class="lazy" data-src/router/index';
// import "../class="lazy" data-src/assets/style/reset.css";
import 'lib-flexible';
import utils from './utils/utils';
import store from './store/index';
// 配置路由keepAlive状态
utils.setRouterBeforeEach(router);
// runtime模式
new Vue({
router,
store,
render: h => h(App)
}).$mount('#app');
3.store/modules/common.js文件
vuex管理缓存数组，编写添加和删除缓存路由方法
const UPDATE_CACHEDROUTENAMES = 'update_cachedroutenames';
const state = {
activatedReloadData: true, // 页面activated时是否需要重新加载
// 缓存的路由列表
cachedRouteNames: []
};
const mutations = {
[UPDATE_CACHEDROUTENAMES](st, { action, route }) {
const methods = {
add: () => {
st.cachedRouteNames.push(route);
},
delete: () => {
st.cachedRouteNames.splice(st.cachedRouteNames.findIndex(e => e === route), 1);
}
};
methods[action]();
}
};
export default {
namespaced: true,
state,
mutations
};
4.utils/utils.js文件
配置路由keepAlive状态
import store from '../store/index';
const { cachedRouteNames } = store.state.common;
const changeRoutes = (route, type) => {
const routeName = route.components.default.name;
if (routeName && type === 'add' ? !cachedRouteNames.includes(routeName) : cachedRouteNames.includes(routeName)) {
store.commit('common/update_cachedroutenames', {
action: type,
route: routeName
});
}
};
// 定义添加缓存组件name函数，设置的时组件的name
const addRoutes = (route) => {
changeRoutes(route, 'add');
};
// 定义删除缓存组件name函数，设置的是组件的name
const deleteRoutes = (route) => {
changeRoutes(route, 'delete');
};
// 配置路由keepAlive状态
const setRouterBeforeEach = (router) => {
router.beforeEach((to, from, next) => {
// 对该组件是否读取缓存进行处理
to.matched.forEach((item) => {
const routes = item.meta.cachedRouteNames;
if (item.meta.keepAlive && (!routes || (routes && (!from.name || routes.includes(from.name))))) {
addRoutes(item);
} else {
deleteRoutes(item);
}
});
next();
});
// 全局混入。在该组件被解析之后，若是属于需要缓存的组件，先将其添加到缓存配置中，进行缓存
Vue.mixin({
beforeRouteEnter(to, from, next) {
next(() => {
to.matched.forEach((item) => {
if (to.meta.keepAlive) {
addRoutes(item);
}
});
});
},
});
};
export default {
setRouterBeforeEach
};
5.store/index.js文件
import Vue from 'vue';
import Vuex from 'vuex';
import actions from './actions';
import mutations from './mutations';
import state from './state';
import getters from './getters';
import app from './modules/app';
import common from './modules/common';
Vue.use(Vuex);
const store = new Vuex.Store({
modules: { app, common },
state,
mutations,
actions,
getters
});
export default store;
6.router/index.js文件
keepAlive：设置缓存cachedRouteNames：设置缓存条件
// An highlighted block
import Vue from 'vue';
import VueRouter from 'vue-router';
Vue.use(VueRouter);
const Home = resolve => require(['../routers/Home.vue'], resolve);
const List = resolve => require(['../routers/list.vue'], resolve);
const Detail = resolve => require(['../routers/detail.vue'], resolve);
const router = new VueRouter({
routes: [
{
name: 'Home',
path: '/home',
component: Home
},
{
name: 'List',
path: '/list',
component: List,
meta: {
keepAlive: true,
// 缓存条件：从List --> Detail 则缓存List
cachedRouteNames: ['Detail']
}
},
{
name: 'Detail',
path: '/detail',
component: Detail
}
]
});
export default router;
7.routers/Home.vue文件
export default {
name: 'Home',
components: {
HeaderBar
},
data() {
return {
list: [
'查询1',
'查询2'
]
};
},
created() {
// this.getData();
// console.log(111111);
},
};
</script>
以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
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