官网

Github: https://github.com/davidshimjs/qrcodejs
qrcode.js原理是用html5 Canvas画布生成二维码.
使用

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

<script type="text/javascript">
var qrcode = new QRCode(document.getElementById("qrcode"), {
    text: "http://jindo.dev.naver.com/collie",
    width: 128,
    height: 128,
    colorDark : "#000000",
    colorLight : "#ffffff",
    correctLevel : QRCode.CorrectLevel.H
});

//其他操作
qrcode.clear(); // clear the code.
qrcode.makeCode("http://naver.com"); // make another code.
</script>