如何在vue项目中利用keep-alive组件实现无刷新效果

<template>
  <div>
    <h2>Home页面</h2>
    <p>计数器: {{ count }}</p>
    <button @click="increment">增加</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      count: 0
    };
  },
  methods: {
    increment() {
      this.count++;
    }
  }
};
</script>

<template>
  <div>
    <h2>About页面</h2>
    <p>计数器的值: {{ count }}</p>
    <button @click="goBack">返回</button>
  </div>
</template>

<script>
export default {
  computed: {
    count() {
      return this.$store.state.count;
    }
  },
  methods: {
    goBack() {
      this.$router.go(-1);
    }
  }
};
</script>

import Vue from 'vue';
import Router from 'vue-router';
import Home from '@/views/Home.vue';
import About from '@/views/About.vue';

Vue.use(Router);

export default new Router({
  routes: [
    {
      path: '/',
      name: 'Home',
      component: () => import('@/views/Home.vue'),
      meta: {
        keepAlive: true // 设置keep-alive为true
      }
    },
    {
      path: '/about',
      name: 'About',
      component: () => import('@/views/About.vue'),
      meta: {
        keepAlive: false // 设置keep-alive为false
      }
    }
  ]
});

<template>
  <div id="app">
    <keep-alive>
      <router-view :key="$route.fullPath"></router-view>
    </keep-alive>
  </div>
</template>