Canvas generating random number in the JavaScript link

when export animation in canvas generates random number inside index file , in javascript example:

 

src:"images/bitmap19.jpg?1462231964024

<script src="test.js?1462321721905"></script>

 

does know why happens? have same version installed in computer , has never happened.

 

thank you.

those numbers appended cache-buster local web server doesn't display old content when previewing page.

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