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本文主要介绍了微信小程序实战篇之购物车的实现代码示例，详细的介绍了购物车的功能实现，具有一定的参考价值，有兴趣的可以了解一下，希望能帮助到大家。
购物车的界面实现到不是很难，难点是处理里面的逻辑，无论是小程序，还是APP，购物车的逻辑都是最难的，下面开始教大家如何实现购物车了，先上效果图：
购物车实现
cart.wxml
<import src="/template/quantity/index.wxml" />
<scroll-view class="scroll" scroll-y="true">
<view class="separate"></view>
<view wx:for="{{carts}}">
<view class="cart_container">
<image class="item-select" bindtap="switchSelect" data-index="{{index}}" data-id="{{index}}" src="{{item.isSelect?'../../images/cart/comment_select.png':'../../images/cart/comment_normal.png'}}" />
<image class="item-image" src="{{item.pic}}"></image>
<view class="column">
<text class="title">{{item.name}}</text>
<view class="row">
<text class="sku-price">￥</text>
<text class="sku-price">{{item.price}}</text>
<view class="sku">
<template is="quantity" data="{{ ...item.count, componentId: index }}" />
</view>
</view>
</view>
</view>
<view class="separate"></view>
</view>
</scroll-view>
<view class="bottom_total">
<view class="bottom_line"></view>
<view class="row">
<image class="item-allselect" bindtap="allSelect" src="{{isAllSelect?'../../images/cart/comment_select.png':'../../images/cart/comment_normal.png'}}" />
<text class="small_text">全选</text>
<text>合计:￥ </text>
<text class="price">{{totalMoney}}</text>
<button class="button-red" bindtap="toBuy" formType="submit">去结算</button>
</view>
</view>布局不是很复杂，一个循环列表，循环出购物车商品，外加一个结算的底部控件，还需要提醒的是，循环列表外面要加一层scroll-view，这样当数据很多是时候，可以滚动，不熟悉scroll-view的，请自行翻看前面几篇文章，里面有讲解
cat.wxss
/* pages/cart/cart.wxss */
.cart_container {
display: flex;
flex-direction: row;
}
.scroll {
margin-bottom: 120rpx;
}
.column {
display: flex;
flex-direction: column;
}
.row {
display: flex;
flex-direction: row;
align-items: center;
}
.sku {
margin-top: 60rpx;
margin-left: 100rpx;
}
.sku-price {
color: red;
position: relative;
margin-top: 70rpx;
}
.price {
color: red;
position: relative;
}
.title {
font-size: 38rpx;
margin-top: 40rpx;
}
.small_text {
font-size: 28rpx;
margin-right: 40rpx;
margin-left: 10rpx;
}
.item-select {
width: 40rpx;
height: 40rpx;
margin-top: 90rpx;
margin-left: 20rpx;
}
.item-allselect {
width: 40rpx;
height: 40rpx;
margin-left: 20rpx;
}
.item-image {
width: 180rpx;
height: 180rpx;
margin: 20rpx;
}
.bottom_line {
width: 100%;
height: 2rpx;
background: lightgray;
}
.bottom_total {
position: fixed;
display: flex;
flex-direction: column;
bottom: 0;
width: 100%;
height: 120rpx;
line-height: 120rpx;
background: white;
}
.button-red {
background-color: #f44336; /* 红色 */
}
button {
position: fixed;
right: 0;
color: white;
text-align: center;
display: inline-block;
font-size: 30rpx;
border-radius: 0rpx;
width: 30%;
height: 120rpx;
line-height: 120rpx;
}wxss样式没什么可说的，了解其属性，调用class就好，重点说一下cart.js,全篇的逻辑都在这里面
cart.js
// pages/cart/cart.js
var Temp = require('../../template/contract.js');
Page(Object.assign({}, Temp.Quantity, {
data: {
isAllSelect:false,
totalMoney:0,
// 商品详情介绍
carts: [
{
pic: "http://mz.djmall.xmisp.cn/files/product/20161201/148058328876.jpg",
name:"日本资生堂洗颜",
price:200,
isSelect:false,
// 数据设定
count: {
quantity: 2,
min: 1,
max: 20
},
},
{
pic: 'http://mz.djmall.xmisp.cn/files/product/20161201/148058301941.jpg',
name: "倩碧焕妍活力精华露",
price: 340,
isSelect: false,
// 数据设定
count: {
quantity: 1,
min: 1,
max: 20
},
},
{
pic: 'http://mz.djmall.xmisp.cn/files/product/20161201/14805828016.jpg',
name: "特效润肤露",
price: 390,
isSelect: false,
// 数据设定
count: {
quantity: 3,
min: 1,
max: 20
},
},
{
pic: 'http://mz.djmall.xmisp.cn/files/product/20161201/148058228431.jpg',
name: "倩碧水嫩保湿精华面霜",
price: 490,
isSelect: false,
// 数据设定
count: {
quantity: 1,
min: 1,
max: 20
},
},
{
pic: 'http://mz.djmall.xmisp.cn/files/product/20161201/148057953326.jpg',
name: "兰蔻清莹柔肤爽肤水",
price: 289,
isSelect: false,
// 数据设定
count: {
quantity: 10,
min: 1,
max: 20
},
},
{
pic: "http://mz.djmall.xmisp.cn/files/product/20161201/148057921620_middle.jpg",
name: "LANCOME兰蔻小黑瓶精华",
price: 230,
isSelect: false,
// 数据设定
count: {
quantity: 1,
min: 1,
max: 20
},
},
],
},
//勾选事件处理函数
switchSelect: function (e) {
// 获取item项的id，和数组的下标值
var Allprice = 0,i=0;
let id = e.target.dataset.id,
index = parseInt(e.target.dataset.index);
this.data.carts[index].isSelect = !this.data.carts[index].isSelect;
//价钱统计
if (this.data.carts[index].isSelect) {
this.data.totalMoney = this.data.totalMoney + this.data.carts[index].price;
}
else {
this.data.totalMoney = this.data.totalMoney - this.data.carts[index].price;
}
//是否全选判断
for (i = 0; i < this.data.carts.length; i++) {
Allprice = Allprice + this.data.carts[i].price;
}
if (Allprice == this.data.totalMoney)
{
this.data.isAllSelect=true;
}
else
{
this.data.isAllSelect = false;
}
this.setData({
carts: this.data.carts,
totalMoney: this.data.totalMoney,
isAllSelect: this.data.isAllSelect,
})
},
//全选
allSelect: function (e) {
//处理全选逻辑
let i = 0;
if (!this.data.isAllSelect)
{
for (i = 0; i < this.data.carts.length; i++) {
this.data.carts[i].isSelect = true;
this.data.totalMoney = this.data.totalMoney + this.data.carts[i].price;
}
}
else
{
for (i = 0; i < this.data.carts.length; i++) {
this.data.carts[i].isSelect = false;
}
this.data.totalMoney=0;
}
this.setData({
carts: this.data.carts,
isAllSelect: !this.data.isAllSelect,
totalMoney: this.data.totalMoney,
})
},
// 去结算
toBuy() {
wx.showToast({
title: '去结算',
icon: 'success',
duration: 3000
});
this.setData({
showDialog: !this.data.showDialog
});
},
//数量变化处理
handleQuantityChange(e) {
var componentId = e.componentId;
var quantity = e.quantity;
this.data.carts[componentId].count.quantity = quantity;
this.setData({
carts: this.data.carts,
});
}
}));介绍一下用到的