08-书籍购物车案例

李先生 2020年12月17日 96次浏览

书籍购物车案例

image.png

涉及知识点:

  • v-if / v-else
  • v-for
  • @click
  • methods
  • computed

新增过滤器 filters
filters 定义在创建Vue实例的生命周期中,本质上也是函数,对调用的数据进行处理
使用场景:需要重复使用的一种对数据的处理规则,比如想要价格添加小数点后两位及前面添加¥字符
规则:{{data | fileters}} {{methods | fileters}} {{computed | filters}}

index.html

<!DOCTYPE html>

<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></title>
    <link rel="stylesheet" href="./style.css">
     
</head>

<body>
    <div id="app">
        <div v-if="books.length > 0">
            <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="(item,index) in books">
                        <!-- <td v-for="value in item">{{value}}</td> -->
                        <td>{{item.id}}</td>
                        <td>{{item.name}}</td>
                        <td>{{item.date}}</td>
                        <td>{{ item.price | showPrice}}</td>
                        <!-- <td>{{getFinalPrice(item.price)}}</td> -->
                        <td>
                            <button @click="subCount(index)" v-bind:disabled="item.count <= 1">-</button>
                            {{item.count}}
                            <button @click="addCount(index)">+</button>
                        </td>
                        <td>
                            <button @click="removeHandle(index)">移除</button>
                        </td>
                    </tr>
                </tbody>
            </table>
            <h2>总价格:{{totalPrice | showPrice}}</h2>
        </div>
        <div v-else>
            <h2>购物车为空</h2>
        </div>
    </div>
</body>
    <script src="../js/vue.js"></script>
    <script src="./main.js"></script> 
</html>

main.js

const app = new Vue({
    el:'#app',
    data:{
        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
            },
        ]
    },
    methods:{
        getFinalPrice(price){
            return "¥" + price.toFixed(2);
        },
        subCount(index){
            console.log("sub");
            if(this.books[index].count>1){
                this.books[index].count --;
            }
              
        },
        addCount(index){
            console.log("add");
            this.books[index].count ++;
        },
        removeHandle(index){
            this.books.splice(index,1)
        }     
    },
    computed:{
        totalPrice(){
            let totalPrice = 0;
            for(let item of this.books){
                totalPrice += item.price * item.count
            }
            return totalPrice
        },
    },
    filters:{
        showPrice(price){
            return "¥" + price.toFixed(2);
        }
    }
})

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;
}