vue学习(五)基础入门-基础知识(8)-购物车小案例

index.html

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

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>

<body>
    <div id="app">
        <div v-if="books.length">
            <table>
                <thead>
                    <tr>
                        <th></th>
                        <th>作者</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="(item, index) in books">
                        <td>{{item.id}}</td>
                        <td>{{item.author}}</td>
                        <td>{{item.name}}</td>
                        <td>{{item.data}}</td>
                        <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>总价格:{{totalPrice}}</h2>
        </div>
        <h2 v-else>
            购物车为空
        </h2>
    </div>

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

</html>

style.css

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

th, td{
    padding: 8px 16px;
    border:1 px 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,
                author: '曹雪芹',
                name: '红楼梦',
                data:"????-??-??",
                price: 32.0,
                count: 1
            }, {
                id: 2,
                author: '施耐庵',
                name: '水浒传',
                data:"????-??-??",
                price: 30.0,
                count: 1
            }, {
                id: '3',
                author: '罗贯中',
                name: '三国演义',
                data:"????-??-??",
                price: 24.0,
                count: 1
            }, {
                id: 4,
                author: '吴承恩',
                name: '西游记',
                data:"????-??-??",
                price: 20.0,
                count: 1
            }
        ]
    },
    methods:{
        decrement(index){
            this.books[index].count--;
        },
        increment(index){
            this.books[index].count++;
        },
        removeHandler(index){
            this.books.splice(index, 1);
        },
    },
    computed:{
        totalPrice(){
            let totalPrice = 0;
            for(let i = 0; i < this.books.length; i++){
                totalPrice += this.books[i].price * this.books[i].count;
            }
            return totalPrice;
        }
    },
    //全局过滤器 ,filter 不能定义在创建的Vue对象后面 ,filters局部过滤器
    filters:{
        showPrice(price){
            return "¥" + price.toFixed(2);
        }
    },
})

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vue学习(五)基础入门-基础知识(8)-购物车小案例

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