How the ajaxFileUpload.js plug-in supports multiple file uploads_javascript skills

//Code before modification-------
//var oldElement = jQuery('#' fileElementId);
//var newElement = jQuery(oldElement).clone();
//jQuery(oldElement).attr('id', fileId);
//jQuery(oldElement).before(newElement);
//jQuery(oldElement).appendTo(form);
//Code before modification-------
//Modified code-------
for(var i in fileElementId){
var oldElement = jQuery('#' fileElementId[i]);
var newElement = jQuery(oldElement).clone();
jQuery(oldElement).attr('id', fileId);
jQuery(oldElement).before(newElement);
jQuery(oldElement).appendTo(form);
}
//Modified code-------

$.ajaxFileUpload({
url: "./upload/upload.action",
secureuri : false,
//fileElementId:'uploadfile1',//original usage
fileElementId: ['uploadfile1','uploadfile2','uploadfile3','uploadfile4','uploadfile5'],//Current usage
dataType : 'json',
success : function(data) {
ajaxLoadEnd();
if (data.result == "success") {
$.messager.alert('Message','Import successful.','info');
} else {
$('#import_right').dialog('open');
$.messager.alert('Message','Import failed.
Error message:' data.message,'error');
}
},
error: function(data, status, e)
{
ajaxLoadEnd();
$.messager.alert('Message','Import failed.
Error message: Network exception or form data error.','error');
}
});