首先，先上最终的效果图
效果并不是很好看，但是这不是重点。
首先，我们先看下布局：
<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>
非常常见的布局，微商城购物车随处可见，先说明下，在这里，实现选中的功能并不是用传统的label+checkbox实现，而是一个单独的label，目的是为了简化dom结构，在传统的jq项目或者zepto项目中，一般会会这样写，主要是为了方便操作demo，但是vue项目完全不用考虑dom的操作，怎么方便怎么来就ok。
在加些简单的样式，
.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
最近在学习stylus的使用，所以，就当做练习了。
接下就是javascript了。
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()
}
}
}
这里用mock数据来代替后台请求数据的动作，为了方便测试，逻辑比较简单，首先getTotal这个方法用来计算选中的item的数量以及总价，select_one用来处理单个选中的逻辑，slect_all 用来处理全部选中以及全部取消选中的操作，reduce用来处理处理减操作，顾名思义add用来处理加的操作。当然在真实的开发中，还会有校验库存的动作，每次加减都要校验库存。数据处理也会更复杂，但是闻琴弦而知雅意，器原理都是相通的。
github地址传送门
