var requestData = { scene: 'test', path: 'pages/homePage/homePage', width: 430, auto_color: true }; var strData = JSON.stringify(requestData); var options = { hostname: 'api.weixin.qq.com', port: 443, path: '/wxa/getwxacodeunlimit?access_token='+access_token, method: 'POST', headers:{ 'Content-Type': 'application/x-www-form-urlencoded', "Content-Length":strData.length } }; console.log(); var reqHttps = https.request(options, function(resHttps) { resHttps.setEncoding('utf8'); var datas = []; var size = 0; resHttps.on('data', function (data) { var buff=new Buffer(data); //var d = iconv.decode(data, "utf8"); //buff.write(data); datas.push(buff); size += data.length; /* fs.appendFile('./public/images/test.png',buff,function(err){ if(err) return console.error(err); console.log('保存文件成功'); });*/ }); resHttps.on("end", function () { var buff = Buffer.concat(datas, size); console.log(size); fs.writeFile('./public/images/test.png',buff,function(err){ if(err) return console.error(err); console.log('保存文件成功'); }); }); }); 帮忙给看看这样哪里有问题那？谢谢！