qrcode生成二维码微信长按无法识别问题的解决

 <script src="jquery-1.8.3.js" type="text/javascript" charset="utf-8"></script>
 <script src="jquery.qrcode.min.js" type="text/javascript" charset="utf-8"></script>

<div id="qrcode"></div>

// 设置要生成二维码的链接
new QRCode(document.getElementById("qrcode"), codeUrl); 

var qrcode = new QRCode("qrcode", {
 text: codeUrl,
 width: 128,
 height: 128,
 colorDark : "#000000",
 colorLight : "#ffffff",
 correctLevel : QRCode.CorrectLevel.H //容错级别
});

qrcode.clear(); // clear the code.
qrcode.makeCode("http://naver."); // make another code.

<div id="codeDiv" style="display: none;"></div>
<div id="qrcode"></div> 

var qrcode = new QRCode("codeDiv", {
  text: codeUrl,
  render: "canvas", //渲染方式指定canvas方式
  width: 128,
  height: 128,
  typeNumber:-1,//计算模式
  colorDark : "#000000", 
  colorLight : "#ffffff", 
  correctLevel : QRCode.CorrectLevel.H 
 });
 var canvas=document.getElementsByTagName('canvas')[0];
 var img = convertCanvasToImage(canvas);
 $('#qrcode').append(img);// 添加DOM
 //从 canvas 提取图片 image 
 function convertCanvasToImage(canvas) { 
  //新建Image对象
  var image = new Image(); 
  // canvas.toDataURL 返回的是一串Base64编码的URL
  image.src = canvas.toDataURL("image/png"); 
  return image; 
 }