node实现生成带参数的小程序二维码并保存到本地功能示例

var requestp = require(\'request-promise\');
var fs = require(\'fs\'); // 载入fs模块

var wxapi = {};
module.exports = wxapi;
//获取二维码
wxapi.qrcode = async (ctx, next) => {
  //获取access_token
  var access_token = global.access_token
  var qrcodeurl = \'https://api.weixin.qq.com/wxa/getwxacode?access_token=\'+access_token
  let options = {
    method: \'POST\',
    uri: qrcodeurl,
    encoding:null,
    body: {
      \"path\": \'pages/index/index?openid=\'+ctx.query.openid,//带参数的path
      \"width\":280,
      \"is_hyaline\":false
    },
    json: true
  }
  var imgname=\'./public/images/\'+ ctx.query.openid+\'.jpg\'
  var imgnameback=ctx.query.openid+\'.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  64Img = body.toString(\' 64\'); //  64图片编码字符串
        var dataBuffer = new Buffer( 64Img, \' 64\');
        //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)
      });
    }
  })
  //返回图片名
  ctx.body = {
    code: 1,
    img: imgnameback
  }
};