keep-alive根据路径缓存

  {
        path: 'orderList',
        name: 'orderList',
        component: () => import('@/pages/order/orderList/index'),
        meta: {
          title: '订单列表',
          keepAlive: true  // 需要缓存
        }
      },
      {
        path: 'orderDetails',
        name: 'orderDetails',
        component: () => import('@/pages/order/orderList/orderDetails'),
        meta: {title: '订单详情'}
      },

// 这种有个弊端就是当前缓存的页面,下次进入是重新进入了,但是再需要返回到缓存的页面时,会是第一次缓存的信息,这样就不行了
 beforeRouteLeave(to, from, next) {
 // 当要去的页面不是orderDetails的时候，页面就不需要被缓存
    to.name === 'orderDetails' ? from.meta.keepAlive = true : from.meta.keepAlive = false
      next();
  }

强制移除缓存

 首先打印this.$vnode.parent 查看层级
   再路由即将离开的时候强制移除
       beforeRouteLeave(to, from, next) {
    console.log('to==',to)
     console.log('from==',from)
     console.log('this.$vnode.key ==', this.$vnode)
     
     // 强制移除的时候这句代码就不需要了
    // to.name === 'vehicleLicense' ? from.meta.keepAlive = true : from.meta.keepAlive = false

     if(to.name !== 'vehicleLicense' && this.$vnode.parent && this.$vnode.parent.parent.componentInstance.cache) {
      let tag = this.$vnode.parent.tag   // 当前关闭的组件名
      let cache = this.$vnode.parent.parent.componentInstance.cache  // 缓存的组件
      let keys = this.$vnode.parent.parent.componentInstance.keys  // 缓存的组件名
      for(let index in keys){
        if(cache[keys[index]].tag == tag){
             delete cache[keys[index]]
        keys.splice(index, 1)
      }
     
      }

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