7.模块化封装Storage实现缓存数据持久化

var storage={
    set(key,value){
        // 设置为本地缓存方法
      localStorage.setItem(key,JSON.stringify(value));
    },
    get(key){
        // 获取本地缓存方法
       return JSON.parse(localStorage.getItem(key)); 
    },
    remove(key){
        // 删除本地缓存方法
        localStorage.removeItem(key);
    }

}

export default storage;  

<template>
  <div id="app">
    <!-- 监听键盘事件 -->
    <input type="text" v-model="todo" @keydown="AddText($event)">
    
    <br>
    <hr>

    <h2>未完成</h2>
    <ul>
      <li v-for="(item,index) in list" :key="index">
        <div v-if="!item.checkbox">
          <input type="checkbox" v-model="item.checkbox" @change="saveList()"> {{item.title}}---<button @click="RemoveText(index)">删除</button>
        </div>
      </li>
    </ul>
    <h2>已完成</h2>
    <ul>
      <li v-for="(item,index) in list" :key="index" class="finish">
        <div v-if="item.checkbox">
          <input type="checkbox" v-model="item.checkbox" @change="saveList()"> {{item.title}}---<button @click="RemoveText(index)">删除</button>
        </div>
      </li>
    </ul>
  
  </div>
</template>
<script>
// 引入模块
import storage from './model/storage.js';
export default {
  name: 'app',
  data () {
    return { 
      todo:'',
      list:[],
    }
  },
  methods:{
    AddText(e){
      if(e.keyCode==13){
        this.list.push({title:this.todo,checkbox:false})
        this.todo=''
      }
      // 设置为本地缓存
      storage.set('list',this.list);    
    },
    RemoveText(key){
      this.list.splice(key,1)
      storage.set('list',this.list);
    },
    saveList(){
      storage.set('list',this.list);
    }
  },
  mounted(){
    // 生命周期函数，vue页面刷新时触发
    // 读取本地缓存
    var list=storage.get('list');
    if(list){
      this.list=list
    }

  }

}
</script>
<style>
ul li{
list-style-type:none;
}
.finish{
 background-color: #eee
}
</style>