请生成一个共享单车小程序代码，

好的，以下是一个简单的共享单车小程序代码：

//app.js
App({
  globalData: {
    userInfo: null,
    bikes: []
  },
  onLaunch: function () {
    // 获取用户信息
    wx.getSetting({
      success: res => {
        if (res.authSetting['scope.userInfo']) {
          wx.getUserInfo({
            success: res => {
              // 可以将 res 发送给后台解码出 unionId
              this.globalData.userInfo = res.userInfo
            }
          })
        }
      }
    })
  }
})

//index.js
const app = getApp()

Page({
  data: {
    latitude: 0,
    longitude: 0,
    markers: []
  },
  onLoad: function () {
    wx.getLocation({
      type: 'gcj02',
      success: (res) => {
        this.setData({
          latitude: res.latitude,
          longitude: res.longitude
        })
        this.getBikes()
      }
    })
  },
  getBikes: function () {
    let that = this
    wx.request({
      url: 'https://api.bikes.com/bikes',
      method: 'GET',
      success: function (res) {
        that.setData({
          bikes: res.data
        })
        that.renderMarkers()
      }
    })
  },
  renderMarkers: function () {
    let bikes = this.data.bikes
    let markers = []
    for (let i = 0; i < bikes.length; i++) {
      let bike = bikes[i]
      let marker = {
        id: bike.id,
        latitude: bike.latitude,
        longitude: bike.longitude,
        iconPath: '/images/bike.png'
      }
      markers.push(marker)
    }
    this.setData({
      markers: markers
    })
  }
})

//bike.js
Page({
  data: {
    bikeId: '',
    bike: {}
  },
  onLoad: function (options) {
    let bikeId = options.bikeId
    let bike = this.getBikeById(bikeId)
    this.setData({
      bikeId: bikeId,
      bike: bike
    })
  },
  getBikeById: function (bikeId) {
    let bikes = app.globalData.bikes
    for (let i = 0; i < bikes.length; i++) {
      let bike = bikes[i]
      if (bike.id === bikeId) {
        return bike
      }
    }
    return null
  },
  unlockBike: function () {
    wx.showModal({
      title: 'Are you sure?',
      content: 'Do you want to unlock this bike?',
      success: function (res) {
        if (res.confirm) {
          wx.showToast({
            title: 'Bike unlocked!',
            icon: 'success',
            duration: 2000
          })
        } else if (res.cancel) {
          console.log('User cancelled')
        }
      }
    })
  }
})

这个小程序包含了两个页面，一个是地图页面，用来展示共享单车的位置；另一个是单车页面，用来展示单车的详情，并提供解锁功能。这个小程序调用了一个假的共享单车 API，返回了一些假的单车数据。你可以根据实际需求修改这个小程序。