Vue 实现小小购物车

<template>
    <div>
        <h1>购物车</h1>
        <div class="root">
        <Row>
            <Col span='4'>编号</Col>
            <Col span='5'>商品名字</Col>
            <Col span='5'>单价</Col>
            <Col span='5'>数量</Col>
            <Col span='5'>金额</Col>
        </Row>
        <Row v-for="(item,index) in goods" :key="index">
            <Col span="4">{{item.id}}</Col>
            <Col span="5">{{item.name}}</Col>
            <Col span="5">{{item.price}}</Col>
            <Col span="5"><input type="number" v-model="item.num"></Col>
            <Col span="5">{{Subtotal(index)}}</Col>
        </Row>
        <Row>
            <Col span="14">合计</Col>
            <Col span="5">{{Num}}</Col>
            <Col span="5">{{total}}</Col>
        </Row>
        </div>
    </div>
</template>

<script>
    export default {
        name: "ShoppingCart",
        data(){
            return{
                goods:[
                    {id:'001',name:'iphone',price:5999,num:0,total:0},
                    {id:'002',name:'华为',price:4999,num:0,total:0},
                    {id:'003',name:'小米',price:3999,num:0,total:0},
                ]
            }
        },
        computed:{
            Subtotal(){
                return function (index) {
                    let price = this.goods[index].price
                    let num = this.goods[index].num
                    return price*num
                }
            },
            Num:function(){
                    let n =0;
                    this.goods.forEach(function (value) {
                        n+= value.num *1
                    })
                    return n
            },
            total:function () {
                let v = 0;
                this.goods.forEach(function (value) {
                    v += value.num*value.price
                })
                return v
            }
        }
    }
</script>

<style scoped lang="less">
    h1 {
        text-align: center;
        line-height: 4rem;
    }
    .root {
        border-bottom: 1px solid #ccc;
        border-left: 1px solid #ccc;
    }
    .ivu-row {
        line-height: 40px;
        text-align: center;
        /*border-bottom: 1px solid #ccc;*/
        div{
            border-top: 1px solid #ccc;
            border-right: 1px solid #ccc;
        }
        input {
            width: 100%;
            border: none;
            text-align: center;
            /*border-bottom: 1px solid #999;*/
        }
    }
</style>