使用 vue-router 切换页面时怎么设置过渡动画

实现难点 如何判断切换路由时是前进还是后退

每次切换时向左向右切换动画如何实现

解决方案 我们需要给各个页面定义层级,在切换路由时判断用户是进入哪一层页面,如果用户进入更高层级那么做前进动画,如果用户退到低层级那么做后退动画.

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:'
test
'
        }
    },{
        name:'home',
        path:'/home',
        meta:{
            index:1
        },
        component:Home
    },{
        name:'user',
        path:'/user/:id',
        meta:{
            index:2
        },
        component:User
    }]
});

监控路由跳转,判断切换页面之间的层级关系,并以此来判断路由前进或者后退.

export default {
  name: 'App',
  data(){
      return {
          transition:''
      }
  },
  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.transition = 'slide-left';
      }else{
        this.transition = 'slide-right';
      }
    }
  }
}

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);
}