vue实现商城购物车功能

<template>
 <div class="shopcar" id="demo04">
 <div class="header-title">
 <h3>购物车</h3>
 </div>
 <div class="car-list">
 <ul>
 <li class="car-item" v-for="(item,index) in good_list">
 <div class="input-block">
 <label class="input-label" :class="{active: item.is_selected}" :for="'car-checkbox-'+index" @click="select_one(index)"></label>
 </div>
 <div class="car-item-content">
 <div class="car-img">
 <img :src="item.img" />
 </div>
 <div class="car-cont">
 <h3>{{item.title}}</h3>
 <div class="cat-desc">
 <span v-for="spec in item.spec_item">{{spec}}</span>
 </div>
 </div>
 <div class="num">
 <span @click="reduce(index)">-</span>
 <span>{{item.num}}</span>
 <span @click="add(index)">+</span>
 </div>
 <div class="car-price">
 <span class="car-price">￥{{item.price}}</span>
 <span class="car-num">X{{item.num}}</span>
 </div>
 </div>
 </li>
 </ul>
 </div>
 <div class="car-footer">
 <div class="foot-car">
 <label for="foot-check" class="input-label" :class="{active: selected_all}" @click="slect_all"></label>
 </div>
 <div class="total-cont">
 <span>总价：{{totalPrice}}</span>
 <span>共{{totalNum}}件</span>
 </div>
 <div class="btn-box">
 <button>立即下单</button>
 </div>
 </div>
 </div>
</template>

 .header-title
 height 42px
 line-height 42px
 background #f5f5f5
 border-bottom 1px solid #ddd
 .header-title h3
 font-weight normal
 text-align center
 .car-list 
 background #f2f2f2
 margin-top 12px
 padding 8px
 .car-item
 border-bottom 1px solid #ddd
 position relative
 height 76px
 overflow hidden
 .car-checkbox
 display none
 .input-block
 width 30px
 float left
 height 55px
 line-height 55px
 .input-label
 cursor pointer 
 position absolute 
 width 18px 
 height 18px 
 top 18px 
 left 0 
 background #fff 
 border:2px solid #ccc
 border-radius 50%
 .input-label:after 
 opacity 0 
 content '' 
 position absolute 
 width 9px 
 height 5px 
 background transparent 
 top 6px 
 left 6px 
 border 2px solid #333 
 border-top none 
 border-right none 
 -webkit-transform rotate(-45deg) 
 -moz-transform rotate(-45deg) 
 -o-transform rotate(-45deg) 
 -ms-transform rotate(-45deg) 
 transform rotate(-45deg) 
 .car-img
 width 64px
 height 64px
 float left
 overflow hidden
 .car-img img
 width 100%
 .input-label.active
 background #F15A24
 .car-cont 
 margin-left 100px
 .car-cont h3
 font-weight normal
 line-height 24px
 font-size 14px
 .car-price 
 position absolute
 right 12px
 bottom 0px
 width 40px
 height 40px
 text-align right
 .car-price span
 display block
 height 24px
 line-height 24px
 width 100%
 .car-footer 
 height 60px
 background #f5f5f5
 position fixed
 bottom 0
 left 0
 right 0
 .foot-car
 width 42px
 height 60px
 float left
 margin-left 12px
 position relative
 .total-cont 
 height 60px
 line-height 60px
 font-size 16px
 float left
 .total-cont span
 display inline-block 
 margin-left 12px
 .btn-box
 float right
 height 60px
 line-height 60px
 .btn-box button
 height 100%
 width: 100px
 border none
 background #F15A24
 color #fff
 font-size 16px
 .num
 position absolute
 top 28px
 right 25px
 width 120px
 .num span
 display inline-block
 width 28px
 height 28px
 float left
 text-align center
 line-height 28px
 border 1px solid #ddd
 font-size 14px

export default {
 data () {
 return {
 good_list: [
 {
 title: 'Apple iPhone 6s 16GB 玫瑰金色 移动联通电信4G手机',
 img: "http://sc.tywebs.cn/public/upload/goods/2017/04-27/a767693b9a84747f25335f0e33d3d380.jpg",
 num: 2,
 price: 6070.00,
 spec_item:[
 '内存:16G',
 '网络:4G',
 '颜色:玫瑰金'
 ],
 is_selected: false
 },{
 title: 'Apple iPhone 6s 32GB 玫瑰金色 移动联通电信4G手机',
 img: 'http://sc.tywebs.cn/public/upload/goods/2017/04-27/a767693b9a84747f25335f0e33d3d380.jpg',
 num: 2,
 price: 4570.00,
 spec_item:[
 '内存:32G',
 '网络:4G',
 '颜色:玫瑰金'
 ],
 is_selected: true
 },{
 title: 'Apple iPhone 6s 8GB 玫瑰金色 移动联通电信4G手机',
 img: 'http://sc.tywebs.cn/public/upload/goods/2017/04-27/a767693b9a84747f25335f0e33d3d380.jpg',
 num: 2,
 price: 4870.00,
 spec_item:[
 '内存:8G',
 '网络:4G',
 '颜色:玫瑰金'
 ],
 is_selected: false
 },{
 title: 'Apple iPhone 6s 128GB 玫瑰金色 移动联通电信4G手机',
 img: 'http://sc.tywebs.cn/public/upload/goods/2017/04-27/a767693b9a84747f25335f0e33d3d380.jpg',
 num: 2,
 price: 10568.00,
 spec_item:[
 '内存:128G',
 '网络:4G',
 '颜色:玫瑰金'
 ],
 is_selected: true
 },
 ],
 totalPrice: 0,
 totalNum: 0,
 selected_all: false
 }
 },
 mounted: function () {
 this.getTotal();
 },
 watch: {
 'good_list': {
 handler: function (val, oldVal) {
 // console.log(val)
 return val;
 },
 deep: true
 }
 },
 methods: {
 getTotal () {
 this.totalPrice = 0
 this.totalNum = 0
 for (var i = 0; i < this.good_list.length; i++) {
 var _d = this.good_list[i]
 if(_d.is_selected){
 this.totalPrice += _d['price'] * _d['num']
 this.totalNum +=_d['num']
 }
 }
 },
 select_one (index) {
 if(this.good_list[index].is_selected == true){
 this.good_list[index].is_selected = false
 }else{
 this.good_list[index].is_selected = true
 }
 this.getTotal()
 },
 slect_all () {
 if(this.selected_all){
 for (var i = 0; i < this.good_list.length; i++) {
 this.good_list[i].is_selected = false;
 }
 this.selected_all = false 
 }else{
 for (var i = 0; i < this.good_list.length; i++) {
 this.good_list[i].is_selected = true;
 }
 this.selected_all = true 
 }
 this.getTotal()
 },
 reduce (index) {
 if(this.good_list[index].num <= 1) return;
 this.good_list[index].num --
 this.getTotal()
 },
 add (index) {
 this.good_list[index].num ++
 this.getTotal()
 }
 }
 }