title: How to remove value from FormData
body: <p><a href="https://stackoverflow.com/questions/5392344/sending-multipart-formdata-with-jquery-ajax/5976031#5976031">Here</a> is a way to <code>append</code> file to <code>FormData</code> :</p>
  
  <pre><code>  var data = new FormData();
    jQuery.each($('#file')[0].files, function(i, file) {
            data.append('file-'+i, file);
    });
  </code></pre>
  
  <p>is it possible to do as below ?</p>
  
  <pre><code>     data[i].remove();???
   or  data[i] = file;??
  </code></pre>
  
  <p>how iIcan remove or modify a value from <code>data</code> </p>