Vue3转场动画及keepAlive的使用

Vue3相对于Vue2布局稍微有点不同，话不多说直接上代码

App.vue

<template>
  <div>
    <!-- vue3.0配置 -->
    <router-view v-slot="{ Component, route }">
      <transition :name="route.meta.transitionName">
        <keep-alive>
          <component :is="Component" v-if="$route.meta.keepAlive" />
        </keep-alive>
        <component :is="Component" v-if="!$route.meta.keepAlive" />
      </transition>
    </router-view>
  </div>
</template>
<script>
import { defineComponent } from "vue";
export default defineComponent({
  watch: {
    $route(to, from) {
      if (to.meta.level > from.meta.level) {
        to.meta.transitionName = "slide-left";
      } else {
        to.meta.transitionName = "slide-right";
      }
    },
  },
});
</script>

<style lang="scss">
/*
    动画样式
    will-change: transform    优化渲染速度
*/

.slide-right-enter-active,
.slide-right-leave-active,
.slide-left-enter-active,
.slide-left-leave-active {
  will-change: transform;
  transition: all 0.5s;
  width: 100%;
  position: absolute;
  z-index: 99;
}
.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>

router/index.js

import {
  createRouter,
  createWebHashHistory
} from 'vue-router'
import Home from '../views/Home.vue'

const routes = [{
    path: '/',
    name: 'Home',
    component: Home,
    meta: {
      keepAlive: true,
      level: 1,
      transitionName: ""
    }
  },
  {
    path: '/detail',
    name: 'Detail',
    component: () => import('../views/Detail.vue'),
    meta: {
      keepAlive: true,
      level: 2,
      transitionName: ""
    }
  },
  {
    path: '/city',
    name: 'City',
    component: () => import('../views/City.vue'),
    meta: {
      keepAlive: true,
      level: 0,
      transitionName: ""
    }
  }
]

const router = createRouter({
  history: createWebHashHistory(),
  routes
})
export default router