title: how to specify binary data in jquery post function
body: <p>I have screenshot as binary string.
  I'd like to post some data to server using $.post() function.</p>
  
  <p>My code:</p>
  
  <pre><code>var filename = "screenshot.jpg":
  var filedataUrl = "";// string like 'data:image/jpeg;base64,/9j/4A .....'
  
  $.post(serverUrl, {
  title: title
  name: name
  
  /*here must be my file */
  
  }, function(response) {
                  alert('ok');
  });
  </code></pre>
  
  <p>How can I specify parameter as attached file?</p>