vue路由钩子

• 路由钩子

1.全局钩子
2.某个路由独享钩子
3.组件内钩子

• 全局钩子

beforeEach(全局前置守卫)、afterEach（全局后置钩子）

Router.beforeEach((to,from,next)=>{
      ......
})
Router.afterEach((to,from,next)=>{
      ......
})

• 某个路由独享钩子

1. beforeEnter
2. beforeLeave

{
  path:"/home",
  component:resolve=>require(["../components/home.vue"],resolve),
  beforeEnter:(to,from,next)=>{
      ......
  },
  beforeLeave:(to,from,next)=>{
      ......
  }
}

• 组件内钩子

1.beforeRouteLeave
2.beforeRouteEnter
3.beforeRouteUpdate

  methods:{
      beforeRouteLeave(to,from,next){
            .......
      }
  }