页面内部缓存：

  include包含  exclude 不包含
    <keep-alive>
         <component :is="view"></component>
    </keep-alive>

路由跳转缓存：

   <keep-alive>
        <router-view v-if="$route.meta.keepAlive"></route-view>
    </keep-alive>
    <router-view v-if="!$route.meta.keepAlive"></route-view>
    在路由里 meta：{keepAlive：true}