var $that = $( this );
var data = new FormData( $that.get(0) );<button type="submit">КНОПКА</button>
function addAdditionalOption( $var, $var2, $callback )
[
if ( $var == $var2 ) {
$callback();
}
]
foreach ($fieldsToLoad as $fieldName => $fieldLoader) {
if (!in_array($fieldName, $notLoadFields)) {
addAdditionalOption( $var, $var2, $fieldLoader );
}
}