前言

完整版演示

前面我们对会员系统 分类和商品的开发 完成了收银所需的基础信息 下面我们开始完成收银台的开发

简单画了一个收银的流程图大家参考下

从这张图我们可以分析一下几点

• 可以选择会员或散客收银
• 选择会员使用相应的会员价结算
• 使用会员卡则在价格基础根据卡折扣结算

根据上述分析我搭建了一个简单的收银台

• 左边显示会员和已选择的商品信息
• 右边显示商品的价格信息
• 商品选择后可以修改数字
• 总金额自动计算
• 后续完成挂单功能便于保证收银连续性

开发中运用的组件

1. Tabs 标签页 和 Card 完成右侧的商品选择
2. el-autocomplete 完成会员的检索
3. InputNumber Table 完成购物车开发

收银台运用过多组件会导致页面很乱 我们后续需要进行组件的封装

<template>
  <div class="app-container"  style="border-box:box-sizing;">

<!--    left-->
    <el-row :gutter="30" style="">
      <el-col :span="10">

        <el-autocomplete
          style="width: 100%"
          popper-class="my-autocomplete"
          v-model="querySearchStr"
          :fetch-suggestions="querySearch"
          placeholder="会员检索"
          @select="handleSelect">
          <i
            class="el-icon-search el-input__icon"
            slot="suffix"
           >
          </i>
          <template slot-scope="{ item }">
            <div v-if="item.errorMsg">
              {{item.errorMsg}}
            </div>

            <template v-else>
              <div class="name">
                <i class="el-icon-user"></i>
                {{ item.memberName }}
              </div>
              <span class="addr">
                <i class="el-icon-phone"></i>
                {{ item.memberPhone }}
              </span>
            </template>
          </template>
        </el-autocomplete>

        <el-descriptions  border title="用户信息" v-if="member.memberId" style="margin-top: 20px;margin-bottom: 20px;">
          <el-descriptions-item label="用户名">{{member.memberName}}</el-descriptions-item>
          <el-descriptions-item label="手机号">{{member.memberPhone}}</el-descriptions-item>
          <el-descriptions-item label="备注">
             {{member.remark}}
          </el-descriptions-item>
        </el-descriptions>
        <el-descriptions  border title="用户信息" v-else style="margin-top: 20px;margin-bottom: 20px;">
          <el-descriptions-item label="用户名">散客</el-descriptions-item>
        </el-descriptions>
        <div class="grid-content bg-purple">
          <el-table

            border
            height="400"
            max-height="400"
            :data="shopCart"
            style="width: 100%;margin-bottom: 20px;">

        <el-table-column
          align="center"
          prop="categoryName"
          label="分类"
          width="100">
        </el-table-column>

        <el-table-column
          align="center"
          prop="productName"
          label="商品名"
          >
        </el-table-column>

        <el-table-column
          align="center"
          prop="productAmount"
          label="价格"
          width="100"
        >
          <template slot-scope="scope">
            <span v-if="app.isEmpty(member.memberId)" class="price">{{ scope.row.productAmount }}</span>
            <span v-else="member.memberId" class="price">{{ scope.row.productMemberAmount }}</span>
          </template>
        </el-table-column>

        <el-table-column
          align="center"
          prop="count"
          label="数量"
          width="200"
        >
          <template slot-scope="scope">
            <el-input-number size="mini" :min="0" :max="100" v-model="scope.row.count" @change="handleChange($event,scope)" ></el-input-number>
          </template>
        </el-table-column>

         <el-table-column
           align="center"
          prop="totalPrice"
          label="总金额"
          width="100"
         >
           <template slot-scope="scope">
             <span class="price">{{ scope.row.totalPrice }}</span>
           </template>
        </el-table-column>
      </el-table>
          <el-divider></el-divider>
          总金额: <span class="price">{{app.getFloatStr(getTotalPrice)}}</span>
          <el-divider></el-divider>

          <el-row>
            <el-button type="success">结算</el-button>
            <el-button type="warning">挂单</el-button>
            <el-button type="primary">取单</el-button>
          </el-row>
      </div>
      </el-col>
<!--right-->
      <el-col :span="14">
        <div class="grid-content bg-purple">
        <el-tabs  v-model="activeName" @tab-click="handleClick" type="border-card" style="height: calc(100vh - 180px);width: 100%;overflow: scroll;overflow:hidden;">
          <el-tab-pane
            v-for="(item, index) in categoryList"
            :key="item.categoryId"
            :label="item.categoryName"
            :name="item.categoryId"
          >
            <div>
                <el-row :gutter="20" style="" v-if="productList.length>0">
                <el-col @click.native="chooseProduct(item)" :span="6" v-for="item in productList" :key="item.productId" style="margin-top: 20px;cursor: pointer;">
                  <el-card :body-style="{ padding: '0px' }" style="height: 230px;">

                    <div style="height: 150px;display: flex;align-items: center;justify-content: center; 	box-sizing: border-box;padding-top: 10px;">
                      <img style="width:85%;height: 140px;border-radius: 5px;border: 1px solid #eee;" :src="baseUrl  + item.productImageUrl" class="image"/>
                    </div>
                    <div style="padding:10px 0 0 10px;font-size: 16px;">
                      {{item.productName}}
                    </div>
                    <div style="padding:5px 0 0 10px;">
                      <span style="font-size: 14px;"> 散客价 <span class="price">¥ {{item.productAmount}}</span></span><br/>
                      <span style="font-size: 14px;"> 会员价 <span class="price">¥ {{item.productMemberAmount}}</span></span>
                    </div>

                  </el-card>
                </el-col>
              </el-row>
              <div v-else>
                <el-empty description="该分类商品为空">
                </el-empty>
                </div>
            </div>
          </el-tab-pane>
        </el-tabs>
        </div>
      </el-col>
    </el-row>
  </div>
</template>

<script>
    import {accAdd, accMul,isEmpty} from "@/utils";
    import confirm from "@/utils/confirm";
    import {getCategoryList} from "@/api/business/category/category";
    import {getProductList} from "@/api/business/product/product";
    import {getMemberList} from "@/api/business/member/member";

    export default {
        name: "cashierDesk",
        data(){
          return{
            shopCart: [],
            categoryList: [],
            productList: [],
            activeName: "",
            member: {},
            querySearchStr: '',
          }
        },
      mounted() {
          this.getCategoryList()
      },
      computed:{
        getTotalPrice(){
          let totalPrice = 0;
          for(let product of this.shopCart){
            const noMember = isEmpty(this.member.memberId)
            let productTotalPrice
            if(noMember){
               productTotalPrice = accMul(product.productAmount,product.count)
            }else{
              productTotalPrice = accMul(product.productMemberAmount,product.count)
            }

            this.$set(product, 'totalPrice', productTotalPrice)
            totalPrice = accAdd(totalPrice,productTotalPrice);
          }
          return totalPrice;
        }
      },
      watch:{
        shopCart(newVal,oldVal){
          let showCardList = newVal
          console.log('这是监听属性新的')
        }
      },
      methods:{
        querySearch(queryString, cb) {
            if(queryString){
              getMemberList({querySearch:queryString}).then(res=>{
                // 调用 callback 返回建议列表的数据
                cb(res.data);
              })
            }else{
              cb([
                {errorMsg:'暂无数据'}
              ])
            }

          },
          getCategoryList(){
            getCategoryList().then(res=>{
              this.categoryList = res.data
              if(this.categoryList.length>0){
                this.activeName = this.categoryList[0].categoryId
                getProductList({categoryId:this.activeName }).then(res=>{
                  this.productList = res.data
                })
              }
            })
          },
         handleClick(e){
            //拿到分类id
           const categoryId = e.name
           getProductList({categoryId:categoryId}).then(res=>{
             this.productList = res.data
           })
         },
        handleChange(e,scope){
          console.log(e)
          console.log(scope.$index)
          if(e==0){
            confirm('要删除该条目吗？').then(res=>{
              if(res){
                this.shopCart.splice(scope.$index,1)
              }else{
                this.shopCart[scope.$index].count = 1
              }
            })
          }
        },
        chooseProduct(e){
            let product = e;
            let findProductIndex = this.shopCart.findIndex(p => p.productId ==  product.productId);
            console.log(findProductIndex)
            if(findProductIndex == -1){
              this.$set(product, 'count', 1)
              this.shopCart.push(product)
            }else{
              this.shopCart[findProductIndex].count += 1
            }
            console.log(this.shopCart)
        },
        handleSelect(e){
          console.log(e)
          this.member = e
        }
      }
    }
</script>

<style scoped>
  ::v-deep .el-tabs--border-card>.el-tabs__header .el-tabs__item{
    height: 50px;
    line-height: 50px;
    font-size: 14px;
  }

  .price{
    font-weight: bold;
    color: #ff5b57;
  }
</style>

代码地址
https://gitee.com/ddeatrr/memberShop
然后为了大家预览我把开发板也部署了 大家可以参考
http://store.gbadd.space/