Vue のキープアライブ コンポーネントによりユーザー ページの切り替えがスムーズになる仕組み

<template>
  <div>
    <keep-alive>
      <router-view/>
    </keep-alive>
  </div>
</template>

<script>
export default {
  name: 'App'
}
</script>

<template>
  <ul>
    <li v-for="item in list" :key="item.id" @click="showDetail(item)">
      {{ item.name }}
    </li>
  </ul>
</template>

<script>
export default {
  data() {
    return {
      list: [
        { id: 1, name: 'Apple' },
        { id: 2, name: 'Banana' },
        { id: 3, name: 'Orange' }
      ]
    }
  },
  methods: {
    showDetail(item) {
      // 切换到详情页，并传递选中项的数据
      this.$router.push({
        name: 'Detail',
        params: { item }
      })
    }
  }
}
</script>

<template>
  <div>
    <h2>{{ selectedItem.name }}</h2>
    <p>Details: {{ selectedItem.details }}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      selectedItem: {}
    }
  },
  mounted() {
    // 保存页面加载时的滚动位置
    this.$store.commit('saveScrollPosition', window.pageYOffset)
  },
  activated() {
    // 恢复页面切换时的滚动位置
    window.scrollTo(0, this.$store.state.scrollPosition)
  },
  created() {
    // 获取传递过来的选中项数据
    this.selectedItem = this.$route.params.item
  }
}
</script>

import Vue from 'vue'
import VueRouter from 'vue-router'
import ComponentA from '@/components/ComponentA.vue'
import ComponentB from '@/components/ComponentB.vue'

Vue.use(VueRouter)

const routes = [
  {
    path: '/',
    name: 'ComponentA',
    component: ComponentA
  },
  {
    path: '/detail',
    name: 'Detail',
    component: ComponentB
  }
]

const router = new VueRouter({
  routes
})

export default router