ajaxfileupload上传文件没反应解决方案

		function ajaxFileUpload(){
			$.ajaxFileUpload ({
			 url:'upfile.php',
			 secureuri:false,
			 fileElementId:'pic',
			 dataType: 'json',
	            success : function (data, status){
	                if(typeof(data.error) != 'undefined'){
	                    if(data.error != ''){
	                        alert(data.error);
	                    }else{
	                        alert(data.msg);
	                    }
	                }
	            },
	            error: function(data, status, e){
	                alert(e);
	            }
			 }) 
			 return false;
		}

+添加图片 

$upFilePath = "../userUploadDatas/" . $_SESSION ["userId"] . "/";

$res ["error"] = ""; // 错误信息
$res ["msg"] = "exec"; // 提示信息
if (copy ( $_FILES ['pic'] ['tmp_name'], $upFilePath . $_FILES ['pic'] ['name'] )) {
	$res ["msg"] = "ok";
} else {
	$res ["error"] = "error";
}

echo json_encode ( $res );