beforeRouteEnter 获取不到 vue 实例的解决方法

  beforeRouteEnter(to, from, next) {
    console.log( to.path,from.path)
    next(vm=>{
      if(from.path == '/'){
        if(!vm.$route.query.vin){
          vm.changeVin('')
        } 
        vm.changeSelectAllObj({})
        vm.currentKM = ''
      }
    })
  },

通过 next(vm=>{ 

//vm 就是vue 实例

})