[Javascript] Get Base64 Image from URL

getBase64FromImageUrl.js

function getBase64FromImageUrl(url) {
    var img = new Image();
    img.crossOrigin = "anonymous";
    img.onload = function() {
        var canvas = document.createElement("canvas");
        canvas.width = this.width;
        canvas.height = this.height;
        var ctx = canvas.getContext("2d");
        ctx.drawImage(this, 0, 0);
        var dataURL = canvas.toDataURL("image/png");
        return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
    };
    img.src = url;
}