问Firefox4中的AjaxForm文件上传

EN

<form action="upload.aspx" enctype="multipart/form-data" id="ajaxUploadForm" method="post">
<input type="file" name="fileBase" id="fileBase"><input type="submit" value="send" />
</form>

$( "#ajaxUploadForm" ).ajaxForm( {
iframe: "true",cache: false,
success: function ( response )
{
   var msg = $.parseJSON( $( response ).val() );
   alert ( msg.status); 
}
}} );