vue3 動態修改 keepAlive

需求場景：

跳轉邏輯A跳轉 B,B頁面 表單填寫過程中 跳轉 選擇地址等額選項時,我們需要將B頁面 進行 keepAlive 緩存，達到 返回時不重新渲染

但是我們需要考慮 從 A 頁面到 B 頁面 需要全部重新加載，此類場景 我們需要 動態的去控制 keepAlive

流程圖 A頁面 > B頁面（表單頁面） < 互相跳轉 > C頁面（額外選項 選擇地址類似）

App.vue

<!-- vue3.0配置 -->
<router-view v-slot="{ Component }">
    <keep-alive>
        <component :is="Component" :key="route.name" v-if="route.meta.keepAlive" />
    </keep-alive>
    <component :is="Component" :key="route.name" v-if="!route.meta.keepAlive" />
</router-view>
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import { useRoute } from 'vue-router';
export default defineComponent({
  name: 'App',
  setup(props) {
      const route = useRoute();
      return { route }
  }
})
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router.ts

// ...
{
    path: 'path/BComponent',
    name: 'BComponent',
    component: BComponent,
    meta: {
        title: 'Page B',
        keepAlive: true
    }
},
{
    path: 'path/CComponent',
    name: 'CComponent',
    component: CComponent,
    meta: {
        title: 'Page C',
        keepAlive: false
    }
},
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B.vue

import { useRouter, useRoute, onBeforeRouteLeave } from 'vue-router';
export default defineComponent({
  name: 'B',
  setup(props) {
      const route = useRoute();
      const router = useRouter();
      const changeRouterKeepAlive = (name: string, keepAlive: boolean) => {
	router.options.routes.map((item: any) => {
            if (item.name === name) {
                    item.meta.keepAlive = keepAlive;
            }
	});
      };

      onBeforeRouteLeave((to, from) => {
	if (to.name !== 'c') {
            // 不是去 c 頁面，不緩存
            changeRouterKeepAlive(from.name as string, false);
	} else {
            changeRouterKeepAlive(from.name as string, true);
	}
      });

      return { };
  }
})
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