keepAlive

配置两个地方：

1：

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

2：

{
        path: '/orderList',
        name: 'orderList',
        component: OrderList,
        title: '订单列表',
        meta: {
            keepAlive: true // 缓存
        }
    },

备注：

:key=date，用于：刷新当前路由 router-view中的内容，但是这样感觉会跟keepAlive冲突