jQuery Simple Example

HTML

<script src="//www.addressfinder.co.nz/assets/v2/widget.js"></script>
<canvas id="myCanvas" style="display:none;"></canvas>
<img id="bannerImg" />

JavaScript

var showImage = function() {     
    var img = new Image;
    img.setAttribute('crossOrigin', 'anonymous');
    img.onload = function() {
        var canvas = document.getElementById("myCanvas");  
        var ctx = canvas.getContext("2d");    
        ctx.drawImage(img, 0, 0);  
        var dataurl = canvas.toDataURL();
        localStorage.setItem("img", dataurl);  
        document.getElementById('bannerImg').setAttribute('src', dataurl);
        console.log(dataurl);
    };
    img.src = 'http://advs.jp/cp/barcode/code128.cgi?nt=1&height=80&c=Z103B5-190-311378&.png';
};

showImage();