vue2.0如何实现checkbox类似购物车效果？

Question

如何实现这个复杂的逻辑，以下是我写的一部分，说说思路，谢谢大神^-^

<template>
    <div>
        <table>
            <tr>
                <td><input type="checkbox" v-model="checkAll">全选（{{checkedCount}}）</td>
                <td>产品名称</td>
                <td>价格</td>
                <td>数量</td>
            </tr>
            <tr v-for="(item,$index) in lists">
                <td><input type="checkbox" :value="item.id" v-model="checked" @click="currClick($index,$event)"></td>
                <td>{{item.productName}}</td>
                <td>{{item.price}}</td>
                <td>{{item.count}}</td>
            </tr>
            <tr>
                总价：{{total}}
            </tr>
        </table>
    </div>
</template>
<script>
    export default{
        data() {
            return {
                checked:[],
                totalPrice:[],
                lists : [
                    {
                        productName:'产品1',
                        price:'24',
                        count:'3',
                        id:1
                    },
                    {
                        productName:'产品2',
                        price:'25',
                        count:'6',
                        id:2
                    },
                    {
                        productName:'产品3',
                        price:'54',
                        count:'7',
                        id:3
                    }
                ]
            }
        },
        computed: {
            checkAll: {
              get: function() {
                return this.checkedCount == this.lists.length;
              },
              set: function(value) {
                if (value) {
                    this.checked = this.lists.map(function(item) {
                    return item.id
                  })
                } else {
                  this.checked = []
                }
              }
            },
            checkedCount: {
                get: function() {
                    return this.checked.length;
                }
            },
            total(){
                let sum = 0;
                for(let i=0;i<this.totalPrice.length;i++){
                    sum += this.totalPrice[i];
                }
                return sum;
            }
        },
        methods:{
            currClick(index,event){
                let total = this.lists[index].price * this.lists[index].count;
                this.totalPrice.push(total);
                console.log(this.totalPrice);
            }
        }
    }
</script>
<style>
    tr td{
        width:200px;
        background: #eee;
        padding:10px 0;
    }

</style>

Answer 1

https://jsfiddle.net/dont27/L...

我把题主代码试着运行了下，貌似点击单项的时候总价一直在加？

于是我改了一下思路：

html:

<div id="app">
    <div>
        <table>
            <tr>
                <td><input type="checkbox" v-model="checkAll">全选（{{checkedCount}}）</td>
                <td>产品名称</td>
                <td>价格</td>
                <td>数量</td>
            </tr>
            <tr v-for="(item,$index) in lists">
                <td><input type="checkbox" :value="item.id" v-model="item.checked" @click="currClick($index,$event)"></td>
                <td>{{item.productName}}</td>
                <td>{{item.price}}</td>
                <td>{{item.count}}</td>
            </tr>
            <tr>
                总价：{{total}}
            </tr>
        </table>
    </div>
 </div>

js:

var vm = new Vue({
          el: '#app',
          data: {
            checked:[],
            lists : [
                {
                    productName:'产品1',
                    price:'24',
                    count:'3',
                    id:1,
                    checked:false
                },
                {
                    productName:'产品2',
                    price:'25',
                    count:'6',
                    id:2,
                    checked:false
                },
                {
                    productName:'产品3',
                    price:'54',
                    count:'7',
                    id:3,
                    checked:false
                }
            ]
          },
          computed: {
            checkAll: {
                get: function() {
                  return this.checkedCount == this.lists.length;
                },
                set: function(value) {

                    this.lists = this.lists.map(function(item){item.checked=value;return item;});
                  
                }
            },
            checkedCount: {
                get: function() {
                    return this.lists.filter(function(item){return item.checked}).length;
                }
            },
            total:function(){
                  var sum = 0;
                  var selected = this.lists.filter(function(item){return item.checked});
                  for(let i=0;i<selected.length;i++){
                      sum += +selected[i].price;
                  }
                  return sum;
            }
          },
          methods:{
              currClick:function(index,event){
                 /* var total = this.lists[index].price * this.lists[index].count;
                  this.totalPrice.push(total);
                  console.log(this.totalPrice);*/
              }
          }
        });

全选题主做法我学习了。 单项选中那个，我觉得直接在产品列表里定义一个checked属性，那么总价的计算直接通过过滤列表（条件是checked值）来做计算。而全选的选中和取消，直接对列表做过滤重置。这样少用了不少data变量,好像还不用用到单项的点击了~不知题主意下如何

Answer 2

不太清楚你要的效果 但之前慕课网看过一个关于网站购物车的vue教程
有兴趣可以看看http://www.imooc.com/learn/796