What is QRCode.js?

QRCode.js is a JavaScript library for generating QR codes. It works mainly by obtaining DOM elements and then drawing them via the HTML5 Canvas, without depending on any libraries.

Basic Usage

<div id="qrcode"></div>
<script type="text/javascript">
new QRCode(document.getElementById("qrcode"), "https://www.example.com");  // 设置要生成二维码的链接
</script>

Or use some optional parameter settings:

var qrcode = new QRCode("test", {
    text: "https://www.example.com",
    width: 128,
    height: 128,
    colorDark : "#000000",
    colorLight : "#FFFFFF",
    correctLevel : QRCode.CorrectLevel.H
});

We can also use the following methods:

qrcode.clear(); // 清除代码
qrcode.makeCode("https://www.jyshare.com"); // 生成另外一个二维码

Browser Support

Browsers that support this library include: IE6~10, Chrome, Firefox, Safari, Opera, Mobile Safari, Android, Windows Mobile, etc.

Example Code

HTML Code

<input id="text" type="text" value="https://www.example.com" /><br />
<div id="qrcode"></div>

CSS Code

#qrcode {
width:160px;
  height:160px;
  margin-top:15px;
}  
 

JavaScript Code

var qrcode = new QRCode("qrcode");

function makeCode () {      
    var elText = document.getElementById("text");
    
    if (!elText.value) {
        alert("Input a text");
        elText.focus();
        return;
    }
    
    qrcode.makeCode(elText.value);
}

makeCode();

$("#text").
on("blur", function () {
    makeCode();
}).
on("keydown", function (e) {
    if (e.keyCode == 13) {
        makeCode();
    }
});

Try it Yourself »

Resource Download

Qrcode library: https://cdnjs.cloudflare.com/ajax/libs/qrcodejs/1.0.0/qrcode.min.js