一、Vue3.x 实现一个完整的toDoList（待办事项） 以及类似京东App搜索缓存数据功能

二、 localStorage里面的方法

localStorage.setItem(key,value)

localStorage.getItem(key)

localStorage.removeItem(key);

localStorage.clear();

三、封装localStorage

1、新建models/storage.js

var storage={

    set(key,value){

        localStorage.setItem(key, JSON.stringify(value));
    },
    get(key){

        return JSON.parse(localStorage.getItem(key));
    },remove(key){
        localStorage.removeItem(key);
    }

}

export default storage;

2、代码

<template>
<h2>Vue实现TodoList</h2>
<div class="todolist">
    <input type="text" v-model="todo" @keyup.enter="addData()" />
    <hr />
    <h4>正在进行</h4>
    <ul>
        <template v-for="(item, index) in list" :key="index">
            <li v-if="!item.checked">
                <input type="checkbox" v-model="item.checked" @change="setTodolist()" /> {{ item.title }}----
                <button @click="deleteData(index)">删除</button>
            </li>
        </template>
    </ul>

    <h4>已经完成</h4>
    <ul>
        <template v-for="(item, index) in list" :key="index">
            <li v-if="item.checked">
                <input type="checkbox" v-model="item.checked" @change="setTodolist()" /> {{ item.title }}----
                <button @click="deleteData(index)">删除</button>
            </li>
        </template>
    </ul>
</div>
</template>

<script>
import storage from './models/storage';

export default {
    data() {
        return {
            todo: "",
            list: [],
        };
    },
    methods: {
        addData() {
            this.list.push({
                title: this.todo,
                checked: false,
            });
            this.todo = "";
            storage.set("todolist", this.list);
        },
        deleteData(key) {
            // alert(key)
            this.list.splice(key, 1);
            storage.set("todolist", this.list);
        },
        setTodolist() {
            storage.set("todolist", this.list);
        }
    },
    //页面加载的时候触发的方法
    mounted() {
        let todolist = storage.get("todolist");
        if (todolist) {
            this.list = todolist;
        }
        console.log("页面加载的时候触发的方法");
    }
};
</script>

<style lang="scss">
h2 {
    text-align: center;
}

.todolist {
    width: 500px;
    border: 1px solid #eee;
    margin: 0 auto;
    padding: 20px;

    h3 {
        color: red;
        font-size: 40px;
    }
}
</style>