wx.cloud.callFunction({
 name: 'getImage', // 云函數名稱
 data: { // 小程序碼所需的參數
 page: "pages/xxxx/xxxx",
 id: id,
 },
 complete: res => {
 console.log('callFunction test result: ', res)
 this.setData({ // 獲取返回的小程序碼
 xcxCodeImageData: res.result,
 })
 }
})

npm install --save request // request框架
npm install --save request-promise // request框架promise風格
npm install --save axios // 數據請求框架，可將返回的數據類型設置為流`stream`
# 備注：install 可以簡寫為 i ；save 作用是將這個庫添加到package.json里面

const cloud = require('wx-server-sdk')
const axios = require('axios')
var rp = require('request-promise');
const fs = require('fs');
var stream = require('stream');
# 不需要全部導入，根據實際下面實際使用情況酌情導入

// request框架promise風格
rp('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=secret=appSecret'
 .then(function(resultValue) {
 console.log("請求 success:")
 console.log(JSON.parse(resultValue))
 })
 .catch(function(err) {});
 });

// Nodejs原生寫法
const http = require("https") 
const url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=secret=appSecret" 
http.get(url,(res)=>{
 var resultValue = ""
 res.on("data",(data)=>{
 resultValue+=data
 })
 res.on("end",()=>{
 console.log(resultValue)
 })
 }).on("error",(e)=>{
 console.log(`獲取數據失敗: ${e.message}`)
})

 var options = {
 method: 'POST',
 url: 'https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=' + access_token',
 body: {
 page: "pages/xxx/xxx
 scene: "id=xxx"
 },
 json: true
 };
 rp(options)
 .then(function(parsedBody) {
 console.log(parsedBody) //小程序碼圖片數據
 })
 .catch(function(err) {});

var rp = require('request-promise');
const fs = require('fs');
var stream = require('stream');

// 請求微信access_token
 rp('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=appid&secret=secret')
.then(function(resultValue) {
console.log("請求 success:" + resultValue)
console.log(JSON.parse(resultValue).access_token)

// 請求小程序碼
var http = require("http"),
data = {
 // 小程序碼參數
 "page": "pages/CardDetail/CardDetail",
 "width": 300,
 "scene": "id=W6MIjlJhFW5Pec-Y",
};
data = JSON.stringify(data);
var options = {
 method: "POST",
 host: "api.weixin.qq.com",
 path: "/wxa/getwxacodeunlimit?access_token=" + JSON.parse(resultValue).access_token,
 headers: {
  "Content-Type": "application/json",
  "Content-Length": data.length
 }
 };
 var req = http.request(options, function (res) {
 res.setEncoding("binary");
 var imgData = '';
 res.on('data', function (chunk) {
 imgData += chunk;
 });
 res.on("end", function () {
 
 // 將返回的圖片數據轉化成uploadFile方法fileContent參數所需的文件流形式，且本地輸出數據正常，可以試著用此方法執行uploadFile進行獲取小程序碼，作者采用了方法二
 var bufferStream = new stream.PassThrough();
 bufferStream.end(new Buffer(imgData));
 console.log('uploadFile方法fileContent參數所需的文件流----')
 console.log(bufferStream)
 
 // Sublime Text可以運行輸出到本地，且可以打開二維碼
 // 本地存放路徑
 var path = 'public/'+ Date.now() +'.png';
 fs.writeFile(path, imgData, "binary", function (err) {
  if (err) {
  console.log("down fail");
 }
 console.log("down success");
 });
 });
 });
 req.write(data);
 req.end();
 })
.catch(function(err) {});

const cloud = require('wx-server-sdk')
const axios = require('axios')
var rp = require('request-promise');
cloud.init()

// 云函數入口函數
exports.main = async (event, context) => {
 console.log(event)
 try {
const resultValue = await rp('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=appid&secret=secret')
const token = JSON.parse(resultValue).access_token;
console.log('------ TOKEN:', token);

const response = await axios({
 method: 'post',
 url: 'https://api.weixin.qq.com/wxa/getwxacodeunlimit',
 responseType: 'stream',
 params: {
 access_token: token,
 },
 data: {
 page: event.page,
 width: 300,
 scene: "id=" + event.id,
 },
});

return await cloud.uploadFile({
 cloudPath: 'xcxcodeimages/' + Date.now() + '.png',
 fileContent: response.data,
});
 } catch (err) {
console.log('>>>>>> ERROR:', err)
 }
}