微信小程序美团外卖代码

微信小程序美团外卖代码是一个用于开发类似于美团外卖功能的小程序项目。这个项目通常包括前端界面设计和后端逻辑处理。以下是一些主要的功能模块和代码示例：

### 主要功能模块
1. **用户登录与注册**
2. **商品展示**
3. **购物车**
4. **订单管理**
5. **支付功能**
6. **用户评价**

### 代码示例

#### 1. 用户登录与注册

// app.js
App({
  onLaunch: function () {
    // 登录
    wx.login({
      success: res => {
        if (res.code) {
          // 发送 res.code 到后台换取 openId, sessionKey, unionId
          wx.request({
            url: 'https://example.com/api/login',
            method: 'POST',
            data: {
              code: res.code
            },
            success: response => {
              // 存储用户信息
              wx.setStorageSync('userInfo', response.data.userInfo)
            }
          })
        } else {
          console.log('登录失败！' + res.errMsg)
        }
      }
    })
  }
})

#### 2. 商品展示

// pages/goods/goods.js
Page({
  data: {
    goodsList: []
  },
  onLoad: function () {
    this.getGoodsList()
  },
  getGoodsList: function () {
    wx.request({
      url: 'https://example.com/api/goods',
      method: 'GET',
      success: response => {
        this.setData({
          goodsList: response.data
        })
      }
    })
  }
})

#### 3. 购物车

// pages/cart/cart.js
Page({
  data: {
    cartList: []
  },
  onShow: function () {
    this.getCartList()
  },
  getCartList: function () {
    const cartList = wx.getStorageSync('cartList') || []
    this.setData({
      cartList: cartList
    })
  },
  addToCart: function (e) {
    const goods = e.currentTarget.dataset.goods
    let cartList = this.data.cartList
    const index = cartList.findIndex(item => item.id === goods.id)
    if (index > -1) {
      cartList[index].count += 1
    } else {
      cartList.push({ ...goods, count: 1 })
    }
    this.setData({
      cartList: cartList
    })
    wx.setStorageSync('cartList', cartList)
  }
})

#### 4. 订单管理

// pages/order/order.js
Page({
  data: {
    orderList: []
  },
  onLoad: function () {
    this.getOrderList()
  },
  getOrderList: function () {
    wx.request({
      url: 'https://example.com/api/orders',
      method: 'GET',
      success: response => {
        this.setData({
          orderList: response.data
        })
      }
    })
  }
})

#### 5. 支付功能

// pages/pay/pay.js
Page({
  data: {
    orderId: ''
  },
  onLoad: function (options) {
    this.setData({
      orderId: options.orderId
    })
  },
  pay: function () {
    wx.request({
      url: 'https://example.com/api/pay',
      method: 'POST',
      data: {
        orderId: this.data.orderId
      },
      success: response => {
        wx.requestPayment({
          timeStamp: response.data.timeStamp,
          nonceStr: response.data.nonceStr,
          package: response.data.package,
          signType: 'MD5',
          paySign: response.data.paySign,
          success: res => {
            wx.showToast({
              title: '支付成功',
              icon: 'success'
            })
          },
          fail: res => {
            wx.showToast({
              title: '支付失败',
              icon: 'none'
            })
          }
        })
      }
    })
  }
})

#### 6. 用户评价

// pages/evaluate/evaluate.js
Page({
  data: {
    orderId: '',
    evaluateContent: ''
  },
  onLoad: function (options) {
    this.setData({
      orderId: options.orderId
    })
  },
  submitEvaluate: function () {
    const evaluateContent = this.data.evaluateContent
    wx.request({
      url: 'https://example.com/api/evaluate',
      method: 'POST',
      data: {
        orderId: this.data.orderId,
        content: evaluateContent
      },
      success: response => {
        wx.showToast({
          title: '评价成功',
          icon: 'success'
        })
      }
    })
  }
})