1500字范文 > 微信小程序微商城（八）：缓存实现商品购物车功能

微信小程序微商城（八）：缓存实现商品购物车功能

时间：2018-07-21 07:45:27

IT实战联盟博客：

上一篇：微信小程序微商城（七）：动态API实现商品分类

看效果

购物车.gif

开发计划

1、商品详情页将商品信息放入缓存2、购物车页面读取缓存获取商品信息3、购物车商品计算和删除缓存商品

一、商品详情页将商品信息放入缓存

detail.wxml

<button data-goodid="{{goods.goodsId}}" class="button-addCar" bindtap="addCar" formType="submit">确定</button>

绑定bindtap事件将商品加入购物车。

detail.js

/*** 加入购物车*/addCar: function (e) { var goods = this.data.goods;goods.isSelect=false; var count = this.data.goods.count; var title = this.data.goods.title; if (title.length > 13) {goods.title = title.substring(0, 13) + '...';} // 获取购物车的缓存数组（没有数据，则赋予一个空数组） var arr = wx.getStorageSync('cart') || []; console.log("arr,{}", arr); if (arr.length > 0) { // 遍历购物车数组 for (var j in arr) { // 判断购物车内的item的id，和事件传递过来的id，是否相等 if (arr[j].goodsId == goodsId) {// 相等的话，给count+1（即再次添加入购物车，数量+1） arr[j].count = arr[j].count + 1;// 最后，把购物车数据，存放入缓存（此处不用再给购物车数组push元素进去，因为这个是购物车有的，直接更新当前数组即可） try {wx.setStorageSync('cart', arr)} catch (e) {console.log(e)}//关闭窗口wx.showToast({title: '加入购物车成功！',icon: 'success',duration: 2000});this.closeDialog();// 返回（在if内使用return，跳出循环节约运算，节约性能） return;}} // 遍历完购物车后，没有对应的item项，把goodslist的当前项放入购物车数组 arr.push(goods);} else {arr.push(goods);} // 最后，把购物车数据，存放入缓存 try {wx.setStorageSync('cart', arr) // 返回（在if内使用return，跳出循环节约运算，节约性能） //关闭窗口wx.showToast({ title: '加入购物车成功！', icon: 'success', duration: 2000}); this.closeDialog(); return;} catch (e) { console.log(e)}}

二、购物车页面读取缓存获取商品信息

cart.wxml

<view class="J-shopping-cart-empty" hidden="{{iscart}}"><view class="shopping-cart-empty"><view class="bg"></view> <view class="cart"></view><text class='empty-text'>购物车空空如也</text> <p></p><navigator url="/pages/goods/goods"><a href="//" class="button button-primary" >去抢购 </a></navigator></view></view> <view class="scroll" hidden="{{hidden}}"><scroll-view class="scroll" scroll-y="true"><view class="separate"></view><view wx:for="{{carts}}"><view class="cart_container"> <view wx:if="{{!item.isSelect}}"><icon class="item-select" bindtap="switchSelect" data-index="{{index}}" data-id="{{index}}" type="circle" size="20"></icon></view><view wx:elif="{{item.isSelect}}"><icon class="item-select" bindtap="switchSelect" data-index="{{index}}" data-id="{{index}}" type="success" color="#f0145a" size="20"></icon></view><image class="item-image" src="{{item.imgUrl}}"></image><import src="../template/template.wxml" /><view class="column"><text class="title">{{item.title}}</text><image bindtap="delGoods" id="img{{index}}" data-index="{{index}}" src="../../images/del.png"></image> <view class="row"><text class="sku-price">￥{{item.price * item.count}}</text><view class="sku"><template is="quantity" data="{{ ...item,index:index}}" /> </view></view></view></view><view class="separate"></view></view></scroll-view></view><view class="bottom_total" hidden="{{hidden}}"><view class="bottom_line"></view><view class="row"><view wx:if="{{!isAllSelect}}"><icon class="item-allselect" bindtap="allSelect" type="circle" size="20"></icon></view><view wx:elif="{{isAllSelect}}"><icon class="item-allselect" bindtap="allSelect" type="success" color="#f0145a" size="20"></icon></view><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>

cart.wxss

@import "../template/template.wxss"; page{ background: #f3f4f5; /* font-size: 37.5px; */} .column image { width:33rpx; height:35rpx; display:inline-block; overflow:hidden; float:right; margin-top: -40rpx; margin-left:400rpx;} .J-shopping-cart-empty{ margin: 0; padding: 0; border: 0; font: inherit; font-size: 100%; vertical-align: baseline;}.shopping-cart-empty { height: 250px; padding-top: 3.2rem; padding-bottom: 1.6rem; background-color: #fff; text-align: center; position: relative;} .shopping-cart-empty .bg{ position: absolute; width: 16.29333rem; height: 6.73333rem; background: transparent url(data:image/png;base64,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); left: 50%; -webkit-transform: translateX(-50%); transform: translateX(-50%); background-size: 100%; top: 0;} .shopping-cart-empty .cart{ width: 5.83333rem; height: 7.46rem; background: transparent url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAANwAAAEaCAMAAABNQsmuAAAAY1BMVEUAAAD6AIr32prUAHU4ByEmCxhWIjd0AEHpAIG6NXLwAIXsAIPjAnvjAH1oNk/4AIqvAGHEAGyonp2npKbpAYKLhon73Kz+66X5357/odv74577pM/yVq7kAH/6AIvzAIf/m9Nba+mLAAAAHXRSTlMA6f7rJRcKgeEdlnA+ukLCnlxgwvOWapTY37Kw+AL3QMkAAAdeSURBVHja7V3bcqM6EARHKEiAMBc7tyX2/3/l2iAwztlUIZCQ1EfzsE9bLnc0PT3TujiKvAjKItRgn4fDOyY8ej7cAxKdxHY41IDY3g5Q4BhP2yL/iQ0jLfO0u0WbPWPDWLik6PpIxRzbG0Y5EfEA7nJ81JJPlEopvidwZzBoD3Ddny80aFFEygFb++d6BYN2r5btsHDXW3zhtZK3ehn32K4feG2JuE7xhQwObuno+QHuesJi3Nv7YQauQVq0z17cAMHdF22YAL7A0nJctHtTQvMPpIJCz++HB7YoqiU6iGJ5nqAd3obJ53yD93GGGOKmlHwf14pSxiiFAgfpccmR+40CYhuW7tf5JhGel8v6zH5dNtKcItwgTUNw0dG6SYDRMRaF8Hj5gMElJ+SqmTQNBUZXN8i0q6GrJo3AAxkgQSberWhCCx40uhpazkMfHcLRZgW7jca2VpDRsUYA0y44KyFC7F9UsNWuBkaH7RlhS/kJ2VNJ4B2xECGCkO8p5NDgWAAXwDnXgdXIMh5alBAh9gwB3KBQYKOBIvsMDHrhkN2vYDKEviuM4PupN26hpCdgEUDeNKYU8yIFFbBrxk4NrGcimlMNmJBMDP8meDQ74Vb+pKlrgZeNlN0xUYLYRt5qI2pppHWDeweENMBOeQJ8VxV4EgU+KVoDb7rpmLLF8TleKwKDrUovPyIui8p+9dVitcqX7Z4jLq3Dozqs1rb7Z8QcgcxF90uUAOjy8nseYOiIeJ1FlfGJhaU93hFDzTIl2QiPW0MnzF3kJ1yWGWvtj8nLY1Sis0Y7ozfjxseUc0RwEUutso6YJUTWJ2YL+isBqdW83KV1yTANjCEvC0vOteEnBIe3omNL4IThGyypTR0nhrcF7JLO8AV3u6QzfMHdLukiYTQvB6W7WLOLzBZMaKU79nnJMZ9erHpwqT1wicEDGXIysOfR0trgEaGBdJXF7v1kDt3RspNyT8zaLOlKzIoykO4CupH0gjyw2iedcaUDJV3+PyAdf/UihOJpPunNXr59iDgtMhV8Wdv5FXGxfIrJfQN3J9Hiji31D1wXL9Uub0j3vHhUgXSp+6WSc17Giugsu0RK8xERjy1vruAS+XLCLJm2vPPlpPPHJRISXbrkG3vnEiXl8sSUpPPovGoyyFdLF5POp8O4ebfY+/HQmh2+coFpzeaL89K6NbtC8dqlasD8I91IJa3/05ngi8VAks6nipItBuehS7QcnIekWw7OQ2uWLy8T3lmzVGF7yjvSLde5yZr1h3RscYfiIemyxb3lRDpveme6XMMnl8gb0smjogu3uwfSeTOwDpTrlm7f+HVqdph4UsUumwJSzvYBvnUSvniM8Yp0KhL+qD+eWLPSZFAebb0gnZKEzwbWBJBy92u73pBO/bYH84d0UsJVGOQP6So1CfeKdKoS/hhYU/dJR0v1Q6LeuERUrWuek65yHlyuTjl/SKcs4Q/Sla7nJV1l/ntCOtWu+Yl0rg+sSsbXjHReWLPVGsp5Ys2ukfDHwOo46dSMr1n4YM0mayT8QTq3e+dVEu4J6Wi2rp544RLR9fv37luzKyXcj4E1XyfhfU/qOunWU84D0q2V8IdCOuwSrZZwH0gnu+Z1V48cH1jpagnvZdxt0m2hnPPWrDS+1h7Bc/sAXzK8CbW2y3CbdMp7V//snd0k3RYJd550dCtpXCbdIOHt+sbeZdKx9V2z+6QbjK+XDX8dd12ibRI+I52LA+uavaufpHPWmk0um591dJZ0UuXSLZ/h7MAqVY5v+hBXXSKZldu+mKPWrKyV6bZPcdSaZZ2GrHSUdHLhNmalo2/NypucxdbPcdElku9jpJtfpTm6d2qWlFoY5yTpEt5pWjhJum/h3LqlOuqAY6QbsbVaRminBtakijtdhOtl3B3SUcLHN0IKPZnEXCEdJVncaV23yBGXKCE5n6C12rCNpBPEXuQZnz39lOrDJknXxdbix3NKhc5ToMyp97JSzZ5H4RC0QncLf3QEWasf2jiwWgZ2Q5aZGLwk6VJ7URyPlalXN6XSMUthtq09XvDfmsX8fdfctZnOBOmQf8oAOi/9enVJNS9jzKWTTQoo6yz/+p7hpZNDnUBeOsyKSeTIyglwYoKu3fiwegnJu9ERbREVgU5mSkko7tp1F57jweMPO6XIE0qxEGYzE7MtsypnyY5h+m+Z/3QxLzuGeacjs+hAH42nJuPW4KU7MO8Gr4UFd4NX3fDtDrDdzwvIM14ULztGAepzhAgRIkSIECH0Gg+U5czYxHr78JxZG4dZP5i33IjJnvSjVVtYcvBHJ9NIP8tK/afY1mAzsXNHytlhLws5Wc5/mlCzUUv5fNDZ/z3D16dpTnPukO/9R9R5PBtFmncQsuf5e++iQsvnn8wUxrLSQl4yk+ASy+B+pqXelcssgxsOhE0FRe+9g/yZc7v/TrZ4Mi81Cx0p97Vi/xPc3MKN9/dtLdx8u87AVvKMdamd7nLc0DJx0YeOWxK2OueIZUVh5uhxD48XhcrE8ReAb/tmFJQfqgAAAABJRU5ErkJggg==) no-repeat; background-size: 100%; margin: 0 auto;} .shopping-cart-empty .button { width: 8.46667rem; height: 1.5rem; display: block; margin: 20rpx auto;}.empty-text { font-size: .64667rem; color: #222; margin-top: .53333rem; line-height: .74667rem; font-weight: 400;}.button-primary { border: 1px solid #de3c96; color: #de3c96; text-decoration: none; text-align: center; display: block; border-radius: .21267rem; line-height: 1.5rem; -webkit-appearance: none; background: none; padding: 0 .26667rem; margin: 0; white-space: nowrap; position: relative; text-overflow: ellipsis; font-size: .74333rem; font-family: inherit; cursor: pointer; user-select: none;} .cart_container { display: flex; flex-direction: row; background-color: #FFFFFF; margin-bottom: 10rpx;}.scroll { margin-bottom: 120rpx; }.column { display: flex; flex-direction: column;}.row { display: flex; flex-direction: row; align-items: center;}.sku { margin-left: 100rpx; position: absolute; right: 30rpx; margin-top: 30rpx; }.sku-price { color: red; position: relative; margin-top: 30rpx; }.price { color: red; position: relative;}.title { font-size: 32rpx; margin-top: 40rpx;}.small_text { font-size: 28rpx; margin-right: 40rpx; margin-left: 25rpx;}.item-select { width: 40rpx; height: 40rpx; margin-top: 90rpx; margin-left: 20rpx;}.item-allselect { width: 40rpx; height: 40rpx; margin-left: 20rpx; margin-top:25rpx; }.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; /* margin-top: 300rpx; */border-top: 1rpx solid #ccc; z-index: 99;}.button-red { background-color: #f0145a; 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; /* border: 1rpx solid #ccc; */}

cart.js

/*** 页面的初始数据*/data: { carts: [], //数据 iscart: false, hidden: null, isAllSelect: false, totalMoney: 0,},onShow: function () { // 获取产品展示页保存的缓存数据（购物车的缓存数组，没有数据，则赋予一个空数组） var arr = wx.getStorageSync('cart') || []; console.info("缓存数据："+arr); // 有数据的话，就遍历数据，计算总金额和总数量 if (arr.length > 0) { // 更新数据 this.setData({ carts: arr, iscart: true, hidden: false}); console.info("缓存数据：" + this.data.carts);}else{ this.setData({ iscart: false, hidden: true,});}},

三、购物车商品计算和删除缓存商品

cart.js

//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 * this.data.carts[index].count);} else { this.data.totalMoney = this.data.totalMoney - (this.data.carts[index].price * this.data.carts[index].count);} //是否全选判断for (i = 0; i < this.data.carts.length; i++) {Allprice = Allprice + (this.data.carts[index].price * this.data.carts[index].count);} 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) { this.data.totalMoney = 0; 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 * this.data.carts[i].count);}} 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 = ponentId; var quantity = e.quantity; this.data.carts[componentId].count.quantity = quantity; this.setData({ carts: this.data.carts,});}, /* 减数 */delCount: function (e) { var index = e.target.dataset.index; console.log("刚刚您点击了加一"); var count = this.data.carts[index].count; // 商品总数量-1if (count > 1) { this.data.carts[index].count--;} // 将数值与状态写回 this.setData({ carts: this.data.carts}); console.log("carts:" + this.data.carts); this.priceCount();}, /* 加数 */addCount: function (e) { var index = e.target.dataset.index; console.log("刚刚您点击了加+"); var count = this.data.carts[index].count; // 商品总数量+1 if (count < 10) { this.data.carts[index].count++;} // 将数值与状态写回 this.setData({ carts: this.data.carts}); console.log("carts:" + this.data.carts); this.priceCount();}, priceCount: function (e) { this.data.totalMoney = 0; for (var i = 0; i < this.data.carts.length; i++) { if (this.data.carts[i].isSelect == true) { this.data.totalMoney = this.data.totalMoney + (this.data.carts[i].price * this.data.carts[i].count);}} this.setData({ totalMoney: this.data.totalMoney,})}, /* 删除item */delGoods: function (e) { this.data.carts.splice(e.target.id.substring(3),1); // 更新data数据对象 if (this.data.carts.length > 0) { this.setData({ carts: this.data.carts})wx.setStorageSync('cart', this.data.carts); this.priceCount();} else { this.setData({cart: this.data.carts, iscart: false, hidden: true,})wx.setStorageSync('cart', []);}}

备注

微信小程序微商城系列都是通过https 动态获取数据并展示的，建议从第一篇开始阅读。大家多多支持本系列文章会继续更新下去，谢谢各位！大家在使用过程中有哪些建议可以提出来，我们一起学习哈~~~

微信小程序微商城系列

微信小程序微商城：开发者key获取

微信小程序微商城（一）：https框架搭建并实现导航功能

微信小程序微商城（二）：电商首页轮播、分类导航和新品特卖实现

微信小程序微商城（三）：电商首页福利专场无限下拉刷新动态API数据实现

微信小程序微商城（四）：动态API实现商品详情页（上）

微信小程序微商城（五）：动态API实现商品详情页（下）

微信小程序微商城（六）：动态API实现新品特卖商品流式布局

微信小程序微商城（七）：动态API实现商品分类

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