从零开始，搭建一个简单的购物平台（十六）前端商城部分

心已赠人 2022-12-10 05:59 138阅读 0赞

**从零开始，搭建一个简单的购物平台（十五）前端商城部分：  
[https://blog.csdn.net/time\_\_\_\_\_/article/details/108680599][https_blog.csdn.net_time_article_details_108680599]  
项目源码（持续更新）：[https://gitee.com/DieHunter/myCode/tree/master/shopping][https_gitee.com_DieHunter_myCode_tree_master_shopping]**

**在前几篇文章中，我们对首页，分类列表，公共组件，工具类进行了实现，这篇文章将实现商品详情页进行介绍，这里我们将商品详情页细化成多个组件，利用组件通信方式进行监听传递方式从而实现数据传递和效果逻辑  
先来看看效果**  
![20200924110347986.gif][]

**这个界面我们可以把页面分解成几个组件，分别是顶部的Top，商品信息展示，商品选项框及加入购物车按钮，最后是下方的一个tab切换效果**

### **商品选项框：** ###

**首先对mint-ui官方的Picker，Navbar进行简单的二次封装，然后在商品选项框及加入购物车按钮组件中触发picker组件，加入购物车中有一个添加的动画需要用到animate动画，并将全局购物车列表更新**

*  **shopPicker.vue,封装官方组件，通过商品最大数量显示列表**
    
        <template>
          <div class="shopPicker">
            <mt-popup v-model="popupVisible" position="bottom">
              <mt-picker class="pickerItem" :slots="count" :showToolbar="true" @change="onValuesChange">
                <div>{
             {pickerTitle}}</div>
              </mt-picker>
            </mt-popup>
          </div>
        </template>
        <script>
        import { Picker, Popup } from "mint-ui";
        import Config from "../../config/config";
        const { EventName } = Config;
        export default {
          name: "shopPicker",
          props: ["ShopMaxCount","pickerTitle"],//最大购买数，picker的标题
          data() {
            return {
              popupVisible: false,//是否显示组件
              count: [{ flex: 1, values: [] }]//组件默认模板
            };
          },
          mounted() {
            this.createShopCount();//初始化组件
            this.$events.onEvent(EventName.ShowPicker, this.showPicker);//监听显示picker事件
          },
          destroyed() {
            this.$events.offEvent(EventName.ShowPicker);//注销显示picker事件
          },
          methods: {
            onValuesChange(comp, count) {//数据变化时触发counter中的显示商品数量
              this.$events.emitEvent(EventName.ChangeCount, count[0]);
            },
            showPicker() {
              this.popupVisible = true;
            },
            createShopCount() {//根据传进来的最大数量显示商品数量列表
              this.count[0].values = this.ShopMaxCount;
              for (let i = 0; i < this.ShopMaxCount; i++) {
                this.count[0].values.push(i + 1);
              }
            }
          }
        };
        </script>
        
        <style lang="less" scoped>
        @import "../../style/init.less";
        
        </style>
 *  ** 修改navbar样式并应用至自己组件中**
    
        <template>
          <div class="info">
            <mt-navbar v-model="selected">
              <mt-tab-item v-for="(item,index) in navTitle" :key="index" :id="item.val">{
             {item.name}}</mt-tab-item>
            </mt-navbar>
            <mt-tab-container v-model="selected">
              <mt-tab-container-item class="doc" id="0">
                <div>名称：{
             {shopName}}</div>
                <div>类型：{
             {Type[shopType].name}}</div>
                <div>数量：{
             {shopNum}}个</div>
                <div>￥{
             {shopPrice}}元</div>
              </mt-tab-container-item>
              <mt-tab-container-item class="doc" id="1">
                <div>净含量/克(g)：{
             {shopScale}}</div>
                <div>口味：{
             {taste}}</div>
                <div>产地：{
             {address}}</div>
                <div>保质期：{
             {expiryDate}}</div>
                <div>上架时间：{
             {time}}</div>
              </mt-tab-container-item>
              <mt-tab-container-item id="2">
                <h3>7天包退</h3>
                <h3>15天包换</h3>
                <h3>一年保修</h3>
              </mt-tab-container-item>
            </mt-tab-container>
          </div>
        </template>
        
        <script>
        import { Navbar, TabItem } from "mint-ui";
        import NavConfig from "../../config/navConfig";
        import ShopType from "../../config/shopType";
        
        export default {
          name: "infoNav",
          data() {
            return {
              selected: "0",//默认选中第一项
              navTitle: NavConfig.NavTitle,
              Type: ShopType.shopType,
              ...this.$route.query//路由传参，将商品信息传递到data中
            };
          }
        };
        </script>
        
        <style lang="less" scoped>
        @import "../../style/init.less";
        @fontcolor: #bababa;
        .info {
          .mg(20px auto);
          .navBar();
          h3 {
            text-align: center;
            color: @mainColor;
          }
          .doc div {
            text-align: center;
            padding: 0.625rem 0;
          }
        }
        </style>
    
     
 *  ** 这里的一个难点是加入购物车的动画，想了很多种方法，  
    最后采用一个标签隐藏，另一个标签执行动画的方式让动画效果更好，  
    通过showAnimate变量进行控制执行动画的标签v-show**  
    ![20200925202414436.gif][]
    
    **在动画标签里使用animate.css中的zoomOutUp 效果**
    
        <transition enter-active-class="animated zoomOutUp slow">
                <span v-show="showAnimate" class="icon-jiarugouwuche iconfont addIcon"></span>
        </transition>
    
    ** 当点击加入购物车时触发事件**
    
        addShopCar() {
              this.showAnimate = true;//显示元素
              setTimeout(() => {//延时的目的是等待动画完成
                this.shopCar.countShopItem({//缓存添加购物车数据
                  ...this.$route.query,
                  shopCount: this.shopCount
                });
                this.showAnimate = false;//隐藏元素
              }, 1000);
            }
    
    **完整的counter组件**
    
        <template>
          <ul class="counter">
            <li @click="showPicker">
              数量
              <span>{
             {shopCount}}</span>
            </li>
            <li @click="addShopCar">
              加入购物车
              <span class="icon-jiarugouwuche iconfont"></span>
              <transition enter-active-class="animated zoomOutUp slow">
                <span v-show="showAnimate" class="icon-jiarugouwuche iconfont addIcon"></span>
              </transition>
            </li>
          </ul>
        </template>
        
        <script>
        import Config from "../../config/config";
        const { EventName } = Config;
        export default {
          name: "Counter",
          data() {
            return {
              shopCount: 1,//默认购买商品数量
              showAnimate: false//动画标签隐藏
            };
          },
          created() {
            this.$events.onEvent(EventName.ChangeCount, _count => {//添加事件监听，监听商品数量变化
              this.shopCount = _count;
            });
            this.shopCar = new this.$store.ShopCar();
          },
          destroyed() {
            this.$events.offEvent(EventName.ChangeCount);
          },
          methods: {
            showPicker() {
              this.$events.emitEvent(EventName.ShowPicker);
            },
            addShopCar() {
              this.showAnimate = true;//显示元素
              setTimeout(() => {//延时的目的是等待动画完成
                this.shopCar.countShopItem({//缓存添加购物车数据
                  ...this.$route.query,
                  shopCount: this.shopCount
                });
                this.showAnimate = false;//隐藏元素
              }, 1000);
            }
          }
        };
        </script>
        <style lang="less" scoped>
        @import "../../style/init.less";
        .counter {
          .h(120);
          .w(850);
          background: @mainColor;
          border-radius: 4rem;
          margin: 0 auto;
          .l_h(120);
          li {
            width: 49%;
            display: inline-block;
            .h(46);
            .l_h(46);
            .titleFont();
            .f_s(32);
            text-align: center;
          }
          li:nth-child(2) {
            margin-left: -2px;
            border-left: 1px dashed #dacda3;
            .addIcon {
              position: fixed;
              .f_s(75);
              z-index: -1;
              color: black;
            }
          }
        }
        </style>
    
    **最后在全局[store][]中添加购物车变量处理方法**
    
        countShopItem(_data) {
            if (!_data._id) {//阻塞商品id为空现象
              return
            }
            let _shopCar = this.state//获取原购物车列表
            let list = _shopCar.filter(function (item) {
              return item._id === _data._id;//通过id查找购物车中传递项
            });
            if (list.length == 0) {//未找到时新建购物车商品
              _data.sum = _data.shopCount * _data.shopPrice;//商品总价
              _data.isSelect = false//是否选中商品，购物车界面默认值
              _shopCar.push(_data);
            } else if ((_data.shopNum > list[0].shopCount + _data.shopCount) && (list[0].shopCount + _data.shopCount <= 9) && list[0].shopCount + _data.shopCount > 0) {//找到时更新商品
              list[0].shopCount += _data.shopCount;
              list[0].sum = list[0].shopCount * list[0].shopPrice;
            } else if (list[0].shopCount + _data.shopCount <= 0) {//购物车允许最小值
              this.$events.emitEvent(EventName.CountShop, 'min');
              return;
            } else {//购物车允许最大值
              this.$events.emitEvent(EventName.CountShop, 'max');
              return;
            }
            this.state = _shopCar
            this.$events.emitEvent(EventName.CountShop);
          }
    
    **这样，一个简单的商品详情页面就完成了**

### **下一篇文章，将介绍购物车的其他功能实现，包括删除商品，全选，添加订单接口等** ###

[https_blog.csdn.net_time_article_details_108680599]: https://blog.csdn.net/time_____/article/details/108680599
[https_gitee.com_DieHunter_myCode_tree_master_shopping]: https://gitee.com/DieHunter/myCode/tree/master/shopping
[20200924110347986.gif]: /images/20221123/cb5d7c9e73d74dbe94e85edfa09b3afe.png
[20200925202414436.gif]: /images/20221123/d66e1949bb2342ef99dc243f44212268.png
[store]: https://blog.csdn.net/time_____/article/details/108514710