Vue进阶之利用transition标签实现页面跳转动画

// router/index.js
import VueRouter from 'vue-router'
import Home from '../components/home/home'
import User from '../components/user/user'
var router = new VueRouter({
    routes:[{
        name:'test',
        path:'/',
        meta:{index:0},//meta对象的index用来定义当前路由的层级,由小到大,由低到高
        component:{
            template:'<div>test</div>'
        }
    },{
        name:'home',
        path:'/home',
        meta:{index:1},
        component:Home
    },{
        name:'user',
        path:'/user/:id',
        meta:{index:2},
        component:User
    }]
});

<template>
  <div id="app">
    <transition :name="transitionName">   
      <router-view></router-view>
    </transition>
  </div>
</template>
<script>
export default {
  name: 'App',
  data(){
      return {
          transitionName:''
      }
  },
  watch: {//使用watch 监听$router的变化
    $route(to, from) {
      //如果to索引大于from索引,判断为前进状态,反之则为后退状态
      if(to.meta.index > from.meta.index){
	    //设置动画名称
        this.transitionName = 'slide-left';
      }else{
        this.transitionName = 'slide-right';
      }
    }
  }
}
</script>
<style>
    // 编写slide-left 和 slide-right 类的动画
  	.slide-right-enter-active,
    .slide-right-leave-active,
    .slide-left-enter-active,
    .slide-left-leave-active {
      will-change: transform;
      transition: all 500ms;
      position: absolute;
    }
    .slide-right-enter {
      opacity: 0;
      transform: translate3d(-100%, 0, 0);
    }
    .slide-right-leave-active {
      opacity: 0;
      transform: translate3d(100%, 0, 0);
    }
    .slide-left-enter {
      opacity: 0;
      transform: translate3d(100%, 0, 0);
    }
    .slide-left-leave-active {
      opacity: 0;
      transform: translate3d(-100%, 0, 0);
    }  
</style>