当前位置：首页 > news >正文

Diary26-Vue综合案例1-书籍购物车

news 2025/7/22 17:55:09

Vue综合案例1-书籍购物车

案例要求:

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><link rel="stylesheet" href="./style.css">
</head>
<body><div id="app"></div>
<template id="my-app"><template v-if="books.length > 0"><table><thead><th>序号</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></thead><tbody><tr v-for="(book, index) in books"><td>{{index + 1}}</td><td>{{book.name}}</td><td>{{book.date}}</td><td>{{formatPrice(book.price)}}</td><td><button :disabled="book.count <= 1" @click="decrement(index)">-</button><span class="counter">{{book.count}}</span><button @click="increment(index)">+</button></td><td><button @click="removeBook(index)">移除</button></td></tr></tbody></table><h2>总价格: {{formatPrice(totalPrice)}}</h2></template><template v-else><h2>购物车为空~</h2></template></template>
<script src="../js/vue.js"></script><script src="./index.js"></script>

</body>
</html>

Vue.createApp({template: "#my-app",data() {return {books: [{id: 1,name: '《算法导论》',date: '2006-9',price: 85.00,count: 1},{id: 2,name: '《UNIX编程艺术》',date: '2006-2',price: 59.00,count: 1},{id: 3,name: '《编程珠玑》',date: '2008-10',price: 39.00,count: 1},{id: 4,name: '《代码大全》',date: '2006-3',price: 128.00,count: 1},]}},computed: {// vue2: filter/map/reducetotalPrice() {let finalPrice = 0;for (let book of this.books) {finalPrice += book.count * book.price;}return finalPrice;},// Vue3不支持过滤器了, 推荐两种做法: 使用计算属性/使用全局的方法filterBooks() {return this.books.map(item => {const newItem = Object.assign({}, item);newItem.price = "¥" + item.price;return newItem;})}},methods: {increment(index) {// 通过索引值获取到对象this.books[index].count++},decrement(index) {this.books[index].count--},removeBook(index) {this.books.splice(index, 1);},formatPrice(price) {return "¥" + price;}}
}).mount("#app");

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;
}

.counter {margin: 0 5px;
}

代码解析：

创建button按钮，当执行减少选择图书的操作时，在index.js文件中调用decrement(index)函数，当book.count <= 1（即所选书本个数小于等于1时）执行布尔判断，为ture则button按钮不可被点击，为false则可以点击；当执行增加选择图书的操作时，在index.js文件中调用increment(index)函数
<td><button :disabled="book.count <= 1" @click="decrement(index)">-</button><span class="counter">{{book.count}}</span><button @click="increment(index)">+</button>
</td>
this.books.splice(index, 1);这句代码的含义是从index项开始索引，1表示从当前索引项开始（包含该索引项）向下索引个数
<td><button @click="removeBook(index)">移除</button>
</td>
removeBook(index) {this.books.splice(index, 1);
},
这段代码表示如果有选中图书，则进行app操作；若全部移除图书之后，则在页面上显示购物车为空~

<template v-if="books.length > 0"></template>
<template v-else><h2>购物车为空~</h2>
</template>
这段代码计算图书总金额，注意computed:的使用
computed: {totalPrice() {let finalPrice = 0;for (let book of this.books) {finalPrice += book.count * book.price;}return finalPrice;},
这段CSS代码表示含义为给button按钮左右间距5px
.counter {margin: 0 5px;
}

查看全文

http://www.lryc.cn/news/264426.html