生成小程序二维码nodejs

1.获取小程序token

gettoken: function () {

    console.log("jhajaj");

    return new Promise((resolve, reject) => {

        let APPID = wxappletsconfig.appid;

        let secret = wxappletsconfig.secret;

        let url = `https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=${APPID}&secret=${secret}`

        request.get(url, (err, response, data) => {

            console.log("err", err, data);

            if (err) {

                resolve(false);

            } else {

                let AccessToken = JSON.parse(data);

                resolve(AccessToken);

            }

        })

    })

},

2.生成小程序码

var accessToken = await wx_applets.gettoken(); //获取小程序token

token = accessToken.access_token;

var id = req.body.id;

var userid = req.body.userid;  

var pathstr =req.body.path; //小程序地址

var filename = create_time(); //当前时间

var data =  wx_applets.createwxaqrcode(userid,id,pathstr,token,filename);

var picurl = config.url+"/"+data;

var result = {

    "status": "200",

    "message": "success",

    "data":picurl

}

res.jsonp(result);

3.创建

createwxaqrcode:function(userid,id,path,accessToken,filename){

    // return new Promise((resolve, reject) => {

        var qrcodeurl = 'https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token='+accessToken

        let options = {

          method: 'POST',

          uri: qrcodeurl,

          encoding:null,

          body: {

            "page": path,

            "width":280,

            "is_hyaline":false,

            "scene":id+","+userid

          },

          json: true

        }

        var imgname='uploads/applet/'+filename+'.jpg'

        var imgnameback='applet/'+filename+'.jpg'

        fs.exists(imgname, function (exists) {

          //判断图片是否存在

          if(!exists){

            //通过微信接口获取小程序码

            requestp(options)

            .then(function (body) {

              var base64Img = body.toString('base64'); // base64图片编码字符串

              var dataBuffer = new Buffer(base64Img, 'base64');

              //保存到本地

              fs.writeFile(imgname, dataBuffer, function(err) {

                if(err){

                  console.log(err);

                }else{

                  console.log("保存成功！");

                }

              });

            })

            .catch(function (err) {

              console.log(err)

            });

          }

        })



        return imgnameback;

  // });





},