微信小程序云开发 生成带参小程序码流程

 wx.cloud.callFunction({ name: 'getImage', // 云函数名称 data: { // 小程序码所需的参数 page: "pages/xxxx/xxxx", id: id, }, complete: res => { console.log('callFunction test result: ', res) this.setData({ // 获取返回的小程序码 xcxCodeImageData: res.result, }) } })

 npm install --save request // request框架 npm install --save request-promise // request框架promise风格 npm install --save axios // 数据请求框架，可将返回的数据类型设置为流`stream` # 备注：install 可以简写为 i ；save 作用是将这个库添加到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'); # 不需要全部导入，根据实际下面实际使用情况酌情导入 

 // request框架promise风格 rp('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=secret=appSecret' .then(function(resultValue) { console.log("请求 success:") console.log(JSON.parse(resultValue)) }) .catch(function(err) {}); }); // Nodejs原生写法 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(`获取数据失败: ${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) //小程序码图片数据 }) .catch(function(err) {});

 var rp = require('request-promise'); const fs = require('fs'); var stream = require('stream'); // 请求微信access_token rp('https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=appid&secret=secret') .then(function(resultValue) { console.log("请求 success:" + resultValue) console.log(JSON.parse(resultValue).access_token) // 请求小程序码 var http = require("http"), data = { // 小程序码参数 "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 () { // 将返回的图片数据转化成uploadFile方法fileContent参数所需的文件流形式，且本地输出数据正常，可以试着用此方法执行uploadFile进行获取小程序码，作者采用了方法二 var bufferStream = new stream.PassThrough(); bufferStream.end(new Buffer(imgData)); console.log('uploadFile方法fileContent参数所需的文件流----') console.log(bufferStream) // Sublime Text可以运行输出到本地，且可以打开二维码 // 本地存放路径 var path = 'public/'+ Date.now() +'.png-600'; 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() // 云函数入口函数 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-600', fileContent: response.data, }); } catch (err) { console.log('>>>>>> ERROR:', err) } }