vue 指定组件缓存实例详解

<keep-alive>
 <ponent>
 <!-- 该组件将被缓存！ -->
 </ponent>
</keep-alive>

// 组件 a
export default {
 name: 'a',
 data () {
 return {}
 }
}
<keep-alive include="a">
 <ponent>
 <!-- name 为 a 的组件将被缓存！ -->
 </ponent>
</keep-alive>可以保留它的状态或避免重新渲染
<keep-alive exclude="a">
 <ponent>
 <!-- 除了 name 为 a 的组件都将被缓存！ -->
 </ponent>
</keep-alive>可以保留它的状态或避免重新渲染

<keep-alive include="test-keep-alive">
 <!-- 将缓存name为test-keep-alive的组件 -->
 <ponent></ponent>
</keep-alive>

<keep-alive include="a,b">
 <!-- 将缓存name为a或者b的组件，结合动态组件使用 -->
 <ponent :is="view"></ponent>
</keep-alive>

<!-- 使用正则表达式，需使用v-bind -->
<keep-alive :include="/a|b/">
 <ponent :is="view"></ponent>
</keep-alive>

<!-- 动态判断 -->
<keep-alive :include="includedComponents">
 <router-view></router-view>
</keep-alive>

<keep-alive exclude="test-keep-alive">
 <!-- 将不缓存name为test-keep-alive的组件 -->
 <ponent></ponent>
</keep-alive>

<keep-alive>
 <router-view>
 <!-- 所有路径匹配到的视图组件都会被缓存！ -->
 </router-view>
</keep-alive>

// 组件 a
export default {
 name: 'a',
 data () {
 return {}
 }
}
<keep-alive include="a">
 <router-view>
 <!-- 只有路径匹配到的视图 a 组件会被缓存！ -->
 </router-view>
</keep-alive>

// routes 配置
export default [
 {
 path: '/',
 name: 'home',
 ponent: Home,
 meta: {
 keepAlive: true // 需要被缓存
 }
 }, {
 path: '/:id',
 name: 'edit',
 ponent: Edit,
 meta: {
 keepAlive: false // 不需要被缓存
 }
 }
]
<keep-alive>
 <router-view v-if="$route.meta.keepAlive">
 <!-- 这里是会被缓存的视图组件，比如 Home！ -->
 </router-view>
</keep-alive>

<router-view v-if="!$route.meta.keepAlive">
 <!-- 这里是不被缓存的视图组件，比如 Edit！ -->
</router-view>

{
 path: '/',
 name: 'A',
 ponent: A,
 meta: {
 keepAlive: true // 需要被缓存
 }
}

export default {
 data() {
 return {};
 },
 methods: {},
 beforeRouteLeave(to, from, next) {
  // 设置下一个路由的 meta
 to.meta.keepAlive = true; // 让 A 缓存，即不刷新
 next();
 }
};

export default {
 data() {
 return {};
 },
 methods: {},
 beforeRouteLeave(to, from, next) {
 // 设置下一个路由的 meta
 to.meta.keepAlive = false; // 让 A 不缓存，即刷新
 next();
 }
};