微信小程序商城开发之实现商品加入购物车的功能（代码）

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-1     if (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', []);     }   }

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