<div id="qrcode" style="width:200px; height:200px;position: fixed;bottom: 40%; right: 20%;"></div>

<script src="QRCode.js"></script>

var qrcode = new QRCode(document.getElementById("qrcode"), {width : 200,height : 200}); var token='params';var QRCodeUrl='http://www.baidu.com'+'/Share/ScanQRCode?token='+token;qrcode.makeCode(QRCodeUrl);