JavaScript: Save a blob to disc

gistfile1.js

var saveBlob = (function () {
    var a = document.createElement("a");
    document.body.appendChild(a);
    a.style = "display: none";
    return function (blob, fileName) {
        var url = window.URL.createObjectURL(blob);
        a.href = url;
        a.download = fileName;
        a.click();
        window.URL.revokeObjectURL(url);
    };
}());

saveBlob(file, 'test.zip');

thanks a bunch!

bonjour.
sur mon site, l'utilisateur peut "signer" dans un blob mais.. ensuite je voudrais enregistrer ce blob directement sur le serveur sans aucune boite de message et.. n'y arrive pas..
une partie du code :
save : function(){
//
var canvas = document.getElementById("newSignature");
var dataURL = canvas.toDataURL("image/png");
document.getElementById("saveSignature").src = dataURL;
//window.alert('fin save');
canvas.toBlob(function (blob)
{
var nouvelleImg = document.createElement("img"),
url = URL.createObjectURL(blob);
});
nouvelleImg.src = "image.jpg";
nouvelleImg.canvas.save;
nouvelleImg.savefile("./test.jpg");
nouvelleImg.canvas.URL="http://www.xxxxxxxxxxxxxx.fr/site/protect/signature.png"
nouvelleImg.writeFile();
nouvelleImg.save;

et rien ne fonctionne..
Je débute en javascript.. Merci

URL.createObjectURL(new Blob([blob], {type:"application/octet-stream"}))

prints url into console, once clicked it will prompt system save file dialog

Is there any difference between revoking the blob url through the window URL instance like this:
window.URL.revokeObjectURL(fileUrl)
and removing it by calling the static method directly?:
URL.revokeObjectURL(fileUrl)

Is there any difference between revoking the blob url through the window URL instance like this: window.URL.revokeObjectURL(fileUrl) and removing it by calling the static method directly?: URL.revokeObjectURL(fileUrl)

It's too long ago that I looked into this, but IIRC, there was a difference between testing/CI environments and the browser.