nodejs动态创建二维码的方法

<!--弹出二维码-->
<div class="qrcode">
  <div>
    <p id="saoma">扫描二维码</p>
  </div>
</div>

$.ajax({
   type: 'POST',
   url: '/house',
   data: {
     data:'你的数据'
   },
   dataType: 'json',
   success: function (data) {
     if (data.code == 0) {
        alert("成功");
        $('#saoma').before('<img class="qrcode_show" src="/newQrCode?url='  data.data  '"alt=""/>');       
     }else {
        alert('失败');
     }
   }
})

var express = require('express');
var request = require('request');
var url = require('url');
var qrImg = require('qr-image');

//生成二维码
app.get('/newQrCode', function (req, res) {
  var par = url.parse(req.url, true).query;
  var thisUrl = par.url;
  var thisParam = par.id;
  var imgUrl = thisUrl   '?id='   thisParam;
  var img = qrImg.image(imgUrl, { size: 10 });
  res.writeHead(200, { 'Content-Type': 'image/png' });
  img.pipe(res);
});

var bodyParser = require('body-parser');
var urlencodeRarser = bodyParser.urlencoded({ extended: false });
app.post('/house',urlencodeRarser,function (req, res) {
  var data = req.body;
  var result = JSON.stringify({code:0, data:'http://www.baidu.com/&id='   data.data});
  //console.log(result)
  res.end(result);

});