Write binary data to file in javascript (like image file)

Is there a way to write binary data to local disk files in javascript like image files?

I try it but it works only for txt files:

                                    var fp = fopen('image.jpg', 3);
                                    fwrite(fp, '<?php echo $contents; ?>')

Thanks in advance
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Gurvinder Pal SinghCommented:
In short, you cannot save a file using javascript on client side.

You need to invoke server-side script to save this on server side.

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ZumbaJrAuthor Commented:
I've requested that this question be deleted for the following reason:

It's wrong
Gurvinder Pal SinghCommented:
Kindly explain the reason in detail, or I will have to object to your request.
Gurvinder Pal SinghCommented:
saying "its wrong" and closing the question is not right. Please explain why are you closing the answer
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