Jquery $ .get（）和$ .ajax（）没有得到相同的结果

I use the two different AJAX way to send/receive data from php file but can't get the same result

data.php

<?php
echo "hello";
?>

$.get()

if($(this).val() != '')
{
  $.get(
  'data.php',
  { what: $(this).val() },
  function(data)
  {
    $('#result').html(data);
    alert(data);
  });
}

$.ajax()

$('#choice').change(function()
{
  if($(this).val() != '')
  {
    $.ajax({type: GET, url: "data.php", complete: function(){alert("complete");}, success: function(data){alert(data);}, error: function(){alert("error");}});
});
}

.get() will return "hello" while .ajax() return nothing even no error.

You need to wrap GET inside quotes:

type: "GET"