vue购物车练习

<template>
  <div>
    <h1>购物车</h1>
    <table border="1px" cellspacing="0">
      <tr>
        <th></th>
        <th>编号</th>
        <th>商品名称</th>
        <th>价格</th>
        <th>购买数量</th>
        <th>操作</th>
      </tr>
      <tr v-for="(item,index) in cartList" :key="item.id">
        <td><input type="checkbox" v-model="item.checked"></td>
        <td>{{item.id}}</td>
        <td>{{item.name}}</td>
        <td>¥{{item.price}}</td>
        <td>
          <button @click="item.count--" :disabled="item.count<=0">-</button>
          {{item.count}}
          <button @click="item.count++">+</button>
        </td>
        <td><a href="#" @click.prevent="del(index)" >删除</a></td>
      </tr>
      <tr>
        <td colspan="3">总计：</td>
        <td colspan="3">¥{{totalPrice}}</td>
      </tr>
    </table>
  </div>
</template>
<script>
export default {
  name: 'App',
  data(){
    return{
      cartList: [
        {id:1, checked:false, name:'《细说PHP》', price:10, count:1},
        {id:2, checked:false, name:'《细说网页制作》', price:20, count:1},
        {id:3, checked:false, name:'《细说JavaScript语言》', price:40, count:1},
        {id:4, checked:false, name:'《细说DOM和BOM》', price:50, count:1},
        {id:5, checked:false, name:'《细说Ajax与jQuery》', price:60, count:1},
        {id:6, checked:false, name:'《细说HTML5高级API》', price:70, count:1},
      ]
    }
  },
  methods:{
    del(id){
        this.cartList.splice(id,1)
    }
  },
  computed: {
    totalPrice(){
      let sum =0
        for(let item of this.cartList) {
          console.log(item)
          if(item.checked) {
            sum += item.price * item.count;
          }
        }
        return sum;
    }
  },
}
</script>
<style>
  h1 {
    text-align: center;
    margin-bottom: 20px;
  }
  table{
    margin: 0 auto;
  }
  button{
    margin: 0 5px;
  }
</style>