如何使用Vue进行页面缓存和优化

<template>
  <div>
    <h1>首页</h1>
    <keep-alive>
      <router-view></router-view>
    </keep-alive>
  </div>
</template>

const routes = [
  {
    path: '/',
    name: 'Home',
    component: Home,
    meta: { keepAlive: true }
  },
  {
    path: '/about',
    name: 'About',
    component: About
  },
  // ...
]

<template>
  <div id="app">
    <router-view @hook:activated="keepAlive"></router-view>
  </div>
</template>

<script>
export default {
  methods: {
    keepAlive() {
      const currentRoute = this.$router.currentRoute
      const needKeepAlive = currentRoute.meta.keepAlive

      if (!needKeepAlive) {
        return
      }

      const component = this.$refs.keepAlive.$children[0]
      component.$options.render = null
      component._inactive = false
    }
  }
}
</script>

// 使用计算属性
computed: {
  fullName() {
    return this.firstName + ' ' + this.lastName
  }
}

// 使用缓存属性
data() {
  return {
    firstName: '',
    lastName: '',
    fullName: ''
  }
},
watch: {
  firstName(value) {
    this.fullName = value + ' ' + this.lastName
  },
  lastName(value) {
    this.fullName = this.firstName + ' ' + value
  }
}

<div v-for="item in list" :key="item.id">{{ item.text }}</div>