微信小程序微商城（八）：缓存实现商品购物车功能

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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="//m.vip.com" 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,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) 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 = e.componentId;    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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