7. Vue3 实现toDoList，以及类似京东App搜索缓存数据功能

一、Vue3.x中集成Sass/scsss

1.1、安装sass-loader node-sass

npm install -D sass-loader node-sass

1.2、style中配置sass/scss

lang可以配置scss ，scoped表示这里写的css只有当前组件有效

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

二、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

 2.1、vuedemo-v-show

<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>
        <li v-for="(item, index) in list" :key="index" v-show="!item.checked">
            <input type="checkbox" v-model="item.checked" /> {{ item.title }}----
            <button @click="deleteData(index)">删除</button>
        </li>
    </ul>

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

<script>
export default {
    data() {
        return {
            todo: "",
            list: [],
        };
    },
    methods: {
        addData() {
            this.list.push({
                title: this.todo,
                checked: false,
            });
            this.todo = "";
        },
        deleteData(key) {
            // alert(key)
            this.list.splice(key, 1);
        },
    },
};
</script>

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

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

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

 2.2、vuedemo-v-if

<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" /> {{ 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" /> {{ item.title }}----
                <button @click="deleteData(index)">删除</button>
            </li>
        </template>
    </ul>
</div>
</template>

<script>
export default {
    data() {
        return {
            todo: "",
            list: [],
        };
    },
    methods: {
        addData() {
            this.list.push({
                title: this.todo,
                checked: false,
            });
            this.todo = "";
        },
        deleteData(key) {
            // alert(key)
            this.list.splice(key, 1);
        },
    },
};
</script>

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

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

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