Vue Router路由动态缓存组件使用详解

<keep-alive>  
  <component :is="currentTabComponent"></component>  
</keep-alive>

const routes = [
    {
        path: '/foo',
        component: Foo,
        meta: { keepAlive: true } // 这个组件会被缓存
    },
    {
        path: '/bar',
        component: Bar,
        meta: { keepAlive: false } // 没有设置 meta.keepAlive 或其值为 false，则组件不会被缓存
    }
    // ... 其他路由配置
];

<template>
    <div id="app">
        <keep-alive :include="cachedViews">
            <router-view></router-view>
        </keep-alive>
    </div>
</template>

<script>
    export default {
        name: 'App',
        data() {
            return {
                cachedViews: [] // 存储需要缓存的组件名
            };
        },
        watch: {
            $route(to, from) {
            	// 过滤出需要缓存的组件，即 meta.keepAlive = true 的组件
                const keepAliveComponent = to.matched.filter(record => {
                    return record.meta && record.meta.keepAlive;
                });

                if (keepAliveComponent.length) {
                	// 把需要缓存的组件的name放到cachedViews集合里
                    this.cachedViews = this.cachedViews.concat(keepAliveComponent.map(record => record.name));
                } else {
                    const index = this.cachedViews.indexOf(to.name);
                    if (index > -1) {
                        this.cachedViews.splice(index, 1);
                    }
                }
            }
        }
    };
</script>

<template>
    <div id="app">
        <keep-alive :include="cachedViews">
            <router-view></router-view>
        </keep-alive>
    </div>
</template>

<script>
    import { ref, onMounted, watch, onUnmounted } from 'vue';
    import { useRoute } from 'vue-router';

    export default {
        name: 'App',
        setup() {
            const cachedViews = ref([]);
            const route = useRoute();

            const updateCachedViews = () => {
                const keepAliveComponent = route.matched.filter(record => {
                    return record.meta && record.meta.keepAlive;
                });

                cachedViews.value = keepAliveComponent.map(record => record.name);
            };

            onMounted(() => {
                updateCachedViews();
            });

            watch(
                route,
                () => {
                    updateCachedViews();
                },
                { immediate: false }
            );

            onUnmounted(() => {
                // 清理操作，如果需要的话
            });

            return {
                cachedViews
            };
        }
    };
</script>

<template>
    <div id="app">
        <router-view v-slot="{ Component }">
            <keep-alive v-if="$route.meta && $route.meta.keepAlive">
                <component :is="Component" />
            </keep-alive>
            <component v-else :is="Component" />
        </router-view>
    </div>
</template>

<script>
    import { defineComponent } from 'vue';

    export default defineComponent({
        name: 'App'
    });
</script>

<template>
    <div id="app">
        <keep-alive v-if="$route.meta.keepAlive">
            <router-view></router-view>
        </keep-alive>
        <router-view v-if="!$route.meta.keepAlive"></router-view>
    </div>
</template>

<script>
    import { defineComponent } from 'vue';

    export default defineComponent({
        name: 'App'
    });
</script>