微信小程序商城开发之实现商品加入购物车的功能（代码）-小程序开发

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说明: 作者： King; 分类：计算机; 日期：2021年6月20日

本篇文章给大家带来的内容是关于微信小程序商城开发之实现商品加入购物车的功能（代码），有一定的参考价值，有需要的朋友可以参考一下，希望对你有所帮助。

看效果

2021062014472218251580

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="https://zhishitu.com/ke" 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', []);    }  }

微信小程序商城开发之实现商品加入购物车的功能（代码）-小程序开发

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