【vue】购物车案例

news2024/9/20 1:02:26

@change="fun"：元素值发生改变时，会触发事件fun

在这里插入图片描述

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <table>
            <thead>
                <tr>
                    <!-- 全选 -->
                    <td><input type="checkbox" @click="selectAll" v-model="data.selected"></td>
                    <td>商品名称</td>
                    <td>商品价格</td>
                    <td>库存</td>
                    <!-- colspan2: 单元格跨度为2 -->
                    <td colspan="2">操作</td>
                </tr>
            </thead>
            <tbody>
                <tr v-for="(item, index) in data.list" :key="item.id">
                    <td>
                        <input type="checkbox" :value="item" v-model="data.checkboxList" @change="checkSelect">
                    </td>
                    <td>{{item.name}}</td>
                    <td>{{item.price}}</td>
                    <td>{{item.stock}}</td>
                    <td>
                        <button @click="sub(item)">-</button>
                        {{item.number}}
                        <button @click="add(item)">+</button>
                    </td>
                    <td>
                        <button @click="del(index,item.id)">删除</button>
                    </td>
                </tr>

            </tbody>
            <tfoot>
                <tr>
                    <td>总价格: {{totalPrice()}}</td>
                </tr>
            </tfoot>
        </table>
    </div>

    <script type="module">
        import { createApp, reactive, ref } from './vue.esm-browser.js'
        createApp({
            setup() {
                const data = reactive({
                    selected: false,//全选？
                    checkboxList: [],//购物车中的商品
                    list: [{
                        id: 1,//编号
                        name: '洗衣机',//名字
                        price: 10000,//价格
                        number: 1,//数量
                        stock: 10//库存
                    },
                    {
                        id: 2,
                        name: '电冰箱',
                        price: 20000,
                        number: 2,
                        stock: 8
                    },
                    {
                        id: 3,
                        name: '空调',
                        price: 30000,
                        number: 3,
                        stock: 6
                    },
                    {
                        id: 4,
                        name: '电视',
                        price: 40000,
                        number: 4,
                        stock: 4
                    },
                    {
                        id: 5,
                        name: '微波炉',
                        price: 50000,
                        number: 5,
                        stock: 20
                    }
                    ]
                })
                //全选/反选
                const selectAll = () => {
                    data.selected = !data.selected
                    if (data.selected) {//全选
                        data.checkboxList = data.list
                    }
                    else {//反选
                        data.checkboxList = []
                    }
                }
                //取消一个物品时候，自动取消全选
                const checkSelect = () => {
                    if (data.checkboxList.length == data.list.length && data.list.length != 0) {
                        data.selected = true
                    }
                    else {
                        data.selected = false
                    }
                }

                //计算总价格
                const totalPrice = () => {
                    let total = 0
                    for (let i = 0; i < data.checkboxList.length; i++) {
                        total += data.checkboxList[i].price * data.checkboxList[i].number
                    }
                    return total
                }
                //增加物品数量
                const sub = (value) => {
                    value.number--
                    if (value.number < 1) {
                        value.number = 1
                    }
                }
                //减少物品数量
                const add = (value) => {
                    value.number++
                    if (value.number > value.stock) {
                        value.number = value.stock
                    }
                }
                //删除物品
                const del = (index, id) => {
                    data.list.splice(index, 1)
                    //过滤器：筛选元素，返回新的数组
                    let newArr = data.checkboxList.filter((value, index) => {
                        return value.id != id//删除id相同的元素
                    })
                    data.checkboxList = newArr
                }
                return {
                    data,
                    selectAll,
                    checkSelect,
                    totalPrice,
                    sub,
                    add,
                    del
                }
            }
        }).mount("#app")
    </script>
</body>

</html>