How to download file using JavaScript [closed]

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How to download a file using JavaScript only?

Please don't give me answer like

"Change theMIMEin the sever"

or

window.open(URL,"_blank")

Because I know there are another solutions. Thanks.

EDIT:

The file I want to download is a .JSON file.

---

You can dynamically create an iframe and set its location to the URL you wish to download.

var f = document.createElement("iframe");
f.setAttribute("id", "theFrame");
document.body.appendChild(f);
document.getElementById("theFrame").location = 'http://www.example.com/yourfile.doc';

Not sure if the above works properly. If not, try setting it by src instead of location in the last line:

document.getElementById("theFrame").src = 'http://www.example.com/yourfile.doc';