vue中書籍購物車的實現

阿新 • • 發佈：2021-02-05

實現效果

在這裡插入圖片描述
用到了filter、map、reduce等高階函式

index.html程式碼

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="style.css">
</head>
< 
body>
<div id="app">
    <div v-if="books.length">
        <table>
            <thead>
            <tr>
                <th></th>
                <th>書籍名稱</th>
                <th>出版日期</th>
                <th> 
價格</th>
                <th>購買數量</th>
                <th>操作</th>
            </tr>
            </thead>
            <tbody>
            <tr v-for="(item,index) in books">
                <td>{{item.id}}</td>
                <td 
>{{item.name}}</td>
                <td>{{item.date}}</td>
                <!--過濾器-->
                <td>{{item.price | showPrice}}</td> 
                <td>
                    <button @click="decrement(index)" :disabled="item.count<=1">-</button>
                    {{item.count}}
                    <button @click="increment(index)">+</button>
                </td>
                <td><button @click="removeHandler(index)">移除</button></td>
            </tr>
            </tbody>
        </table>
        <h2>總價格： {{totalPrice | showPrice}}</h2>
    </div>
    <h2 v-else>購物車為空</h2>
</div>

<script src="../js/vue.js"></script>
<script src="main.js"></script>

</body>
</html>

style.css

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;
}

main.js

const app = new Vue({
    el:'#app',
    data: {
        books: [
            {
                id: 1,
                name: '《演算法導論》',
                date: '2006-9',
                price: 85.00,
                count: 1
            },
            {
                id: 2,
                name: '《UNIX程式設計藝術》',
                date: '2006-2',
                price: 59.00,
                count: 1
            },
            {
                id: 3,
                name: '《程式設計珠璣》',
                date: '2006-9',
                price: 39.00,
                count: 1
            },
            {
                id: 4,
                name: '《程式碼大全》',
                date: '2006-9',
                price: 128.00,
                count: 1
            },

        ]
    },
    methods: {
        decrement(index) {
            this.books[index].count--;
        },
        increment(index) {
            this.books[index].count++;
        },
        removeHandler(index) {
            this.books.splice(index,1)
        }
    },
    computed: {
        totalPrice() {
            return this.books.reduce(function (preValue,book) {
                return preValue + book.price * book.count
            },0)
        }
    },
    filters: {
        showPrice(price) {
            return '￥' + price.toFixed(2)
        }
    }
})