vue3 动态修改 keepAlive

需求场景：

跳转逻辑A跳转 B,B页面 表单填写过程中 跳转 选择地址等额选项时,我们需要将B页面 进行 keepAlive 缓存，达到 返回时不重新渲染

但是我们需要考虑 从 A 页面到 B 页面 需要全部重新加载，此类场景 我们需要 动态的去控制 keepAlive

流程图 A页面 > B页面（表单页面） < 互相跳转 > C页面（额外选项 选择地址类似）

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 页面，不缓存
            changeRouterKeepAlive(from.name as string, false);
	} else {
            changeRouterKeepAlive(from.name as string, true);
	}
      });

      return { };
  }
})
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