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How does javascript get data from form submit using "post"

It doesnt. You need to use some sort of server side scripting to handle the data after it is posted...
 
Usually use php or asp to write set javascript variables in a new script that gets 'written' or set values in a hidden field i.e.
<input type='hidden' value='<?php echo $_POST['somvar']'?>' name='hidden_var'>
 
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