关于Vue的一个小案例_methods: { increment(index) { this.books[index].co-优快云博客

本文链接：https://blog.youkuaiyun.com/zhixuejia/article/details/118976255

这是一个使用Vue.js构建的图书计价应用示例，展示了如何动态绑定数据、计算总价以及实现增减和删除图书功能。HTML结构包含表格展示，CSS样式美化了表格布局，JavaScript部分则定义了数据模型、方法和计算属性，实现了购物车的交互逻辑。

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经典的图书计价案例

首先搭建HTML页面

<div id="app">
        <div v-if="books.length">
            <table>
                <thead>
                    <tr>
                        <th></th>
                        <th>书籍名称</th>
                        <th>出版日期</th>
                        <th>价格</th>
                        <th>购买数量</th>
                        <th>操作</th>
                    </tr>
                </thead>
                <tbody>
                    <tr v-for="(items,index) in books">
                        <td>{{items.id}}</td>
                        <td>{{items.name}}</td>
                        <td>{{items.date}}</td>
                        <td>{{getPrice(items.price)}}</td>
                        <td>
                            <button @click="decrement(index)">-</button>
                            {{items.count}}
                            <button @click="increment(index)">+</button>
                        </td>
                        <td @click="remove(index)"><button>移除</button></td>
                    </tr>
                </tbody>
            </table>
        </div>
        <div v-else>购物车为空</div>
        <h2>总价格：{{totalPrice}}</h2>
    </div>

CSS

<style>
        table {
            border: 1px solid #e9e9e9;
            border-collapse: collapse;
            border-spacing: 0;
        }

        th,
        td {
            padding: 8px 16px;
            border: 1px solid #e9e9e9;
            text-align: left;
        }

        th {
            background-color: #f7f7f7;
            color: #5c6b77;
            font-weight: 600;
        }
    </style>

然后是js部分

动态绑定数据

绑定方法

通过遍历，遍历books计算总价

<script>
        const app = new Vue({
            el: '#app',
            data: {
                books: [{
                    id: 1,
                    name: '《算法导论》',
                    date: '2006-9',
                    price: 85.0,
                    count: 1,
                },
                {
                    id: 2,
                    name: '《UNIX编程艺术》',
                    date: '2006-2',
                    price: 59.0,
                    count: 1,
                },
                {
                    id: 3,
                    name: '《编程珠玑》',
                    date: '2008-10',
                    price: 39.0,
                    count: 1,
                },
                {
                    id: 4,
                    name: '《代码大全》',
                    date: '2006-3',
                    price: 128.0,
                    count: 1,
                },]
            },
            methods: {
                getPrice(price) {
                    return "￥" + price.toFixed(2)
                },
                increment(index) {
                    this.books[index].count++
                },
                decrement(index) {
                    this.books[index].count--
                    if (this.books[index].count = 1) {
                        this.books[index].count = 1
                    }
                },
                remove(index) {
                    this.books.splice(index, 1)
                }
            },
            computed: {
                totalPrice() {
                    totalPrice = 0
                    for (i = 0; i < this.books.length; i++) {
                        totalPrice += this.books[i].price * this.books[i].count
                    }
                    return totalPrice
                }
            }
        })
    </script>

全部代码

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

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../js/vue.js"></script>
    <style>
        table {
            border: 1px solid #e9e9e9;
            border-collapse: collapse;
            border-spacing: 0;
        }

        th,
        td {
            padding: 8px 16px;
            border: 1px solid #e9e9e9;
            text-align: left;
        }

        th {
            background-color: #f7f7f7;
            color: #5c6b77;
            font-weight: 600;
        }
    </style>
</head>

<body>
    <div id="app">
        <div v-if="books.length">
            <table>
                <thead>
                    <tr>
                        <th></th>
                        <th>书籍名称</th>
                        <th>出版日期</th>
                        <th>价格</th>
                        <th>购买数量</th>
                        <th>操作</th>
                    </tr>
                </thead>
                <tbody>
                    <tr v-for="(items,index) in books">
                        <td>{{items.id}}</td>
                        <td>{{items.name}}</td>
                        <td>{{items.date}}</td>
                        <td>{{getPrice(items.price)}}</td>
                        <td>
                            <button @click="decrement(index)">-</button>
                            {{items.count}}
                            <button @click="increment(index)">+</button>
                        </td>
                        <td @click="remove(index)"><button>移除</button></td>
                    </tr>
                </tbody>
            </table>
        </div>
        <div v-else>购物车为空</div>
        <h2>总价格：{{totalPrice}}</h2>
    </div>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                books: [{
                    id: 1,
                    name: '《算法导论》',
                    date: '2006-9',
                    price: 85.0,
                    count: 1,
                },
                {
                    id: 2,
                    name: '《UNIX编程艺术》',
                    date: '2006-2',
                    price: 59.0,
                    count: 1,
                },
                {
                    id: 3,
                    name: '《编程珠玑》',
                    date: '2008-10',
                    price: 39.0,
                    count: 1,
                },
                {
                    id: 4,
                    name: '《代码大全》',
                    date: '2006-3',
                    price: 128.0,
                    count: 1,
                },]
            },
            methods: {
                getPrice(price) {
                    return "￥" + price.toFixed(2)
                },
                increment(index) {
                    this.books[index].count++
                },
                decrement(index) {
                    this.books[index].count--
                    if (this.books[index].count = 1) {
                        this.books[index].count = 1
                    }
                },
                remove(index) {
                    this.books.splice(index, 1)
                }
            },
            computed: {
                totalPrice() {
                    totalPrice = 0
                    for (i = 0; i < this.books.length; i++) {
                        totalPrice += this.books[i].price * this.books[i].count
                    }
                    return totalPrice
                }
            }
        })
    </script>
</body>

</html>