关于vue路由监听事件跳转的问题

 watch: {
    $route: function clearSelectionRow() {
      console.log("success");
      this.$emit("setSelectionFile", []);
    },
  }

$route: [
      function clearSelectionRow() { //回调函数1
        this.$emit("setSelectionFile", []);
      },
      {//回调函数2
        handler(route) {
          
      },
    ],

{
  name: 'home',
  component: Home,
  path: '/home',
  children: [
    {
      path: 'main',
      name: 'main',
      component: Main,
    },
    {
      path: 'login',
      name: 'login',
      component: Login,
    },
  ]
}

watch: {
    "$route.path":{
      handler(to, from) {
        console.log('to:::', to);
        console.log('from:::', from);
      },
      deep: true
    }
  }

beforeRouteEnter (to, from, next) {
    next(vm => {
        // 通过 `vm` 访问组件实例
      })
  },
  beforeRouteUpdate (to, from, next) {
  },
  beforeRouteLeave (to, from, next) {
  }