小程序识别身份证，银行卡，营业执照，驾照的实现

Page({

 //身份证
 shenfenzheng() {
  this.photo("shenfenzheng")
 },
 //银行卡
 yinhangka() {
  this.photo("yinhangka")
 },
 //行驶证
 xingshizheng() {
  this.photo("xingshizheng")
 },

 //拍照或者从相册选择要识别的照片
 photo(type) {
  let that = this
  wx.chooseImage({
   count: 1,
   sizeType: ['original', 'compressed'],
   sourceType: ['album', 'camera'],
   success(res) {
    // tempFilePath可以作为img标签的src属性显示图片
    let imgUrl = res.tempFilePaths[0];
    that.uploadImg(type, imgUrl)
   }
  })
 },

 // 上传图片到云存储
 uploadImg(type, imgUrl) {
  let that = this
  wx.cloud.uploadFile({
   cloudPath: 'ocr/' + type + '.png',
   filePath: imgUrl, // 文件路径
   success: res => {
    console.log("上传成功", res.fileID)
    that.getImgUrl(type, res.fileID)
   },
   fail: err => {
    console.log("上传失败", err)
   }
  })
 },

 //获取云存储里的图片url
 getImgUrl(type, imgUrl) {
  let that = this
  wx.cloud.getTempFileURL({
   fileList: [imgUrl],
   success: res => {
    let imgUrl = res.fileList[0].tempFileURL
    console.log("获取图片url成功", imgUrl)
    that.shibie(type, imgUrl)
   },
   fail: err => {
    console.log("获取图片url失败", err)
   }
  })
 },

 //调用云函数，实现OCR识别
 shibie(type, imgUrl) {
  wx.cloud.callFunction({
   name: "ocr",
   data: {
    type: type,
    imgUrl: imgUrl
   },
   success(res) {
    console.log("识别成功", res)
   },
   fail(res) {
    console.log("识别失败", res)
   }
  })
 }
})

// 云函数入口文件
const cloud = require('wx-server-sdk')
cloud.init()

// 云函数入口函数
exports.main = async(event, context) => {
 let {
  type,
  imgUrl
 } = event
 switch (type) {
  case 'shenfenzheng':
   {
    // 识别身份证
    return shenfenzheng(imgUrl)
   }
  case 'yinhangka':
   {
    // 识别银行卡
    return yinhangka(imgUrl)
   }
  case 'xingshizheng':
   {
    // 识别行驶证
    return xingshizheng(imgUrl)
   }
  default:
   {
    return
   }
 }
}

//识别身份证
async function shenfenzheng(imgUrl) {
 try {
  const result = await cloud.openapi.ocr.idcard({
   type: 'photo',
   imgUrl: imgUrl
  })
  return result
 } catch (err) {
  console.log(err)
  return err
 }
}
//识别银行卡
async function yinhangka(imgUrl) {
 try {
  const result = await cloud.openapi.ocr.bankcard({
   type: 'photo',
   imgUrl: imgUrl
  })
  return result
 } catch (err) {
  console.log(err)
  return err
 }
}
//识别行驶证
async function xingshizheng(imgUrl) {
 try {
  const result = await cloud.openapi.ocr.vehicleLicense({
   type: 'photo',
   imgUrl: imgUrl
  })
  return result
 } catch (err) {
  console.log(err)
  return err
 }
}

try {
  const result = await cloud.openapi.ocr.bankcard({
   type: 'photo',
   imgUrl: imgUrl
  })
  return result
 } catch (err) {
  console.log(err)
  return err
 }