<form  onsubmit="return false" enctype="multipart/form-data">
            <input type="file" id="url_img" name="url_img" onchange="return ajaxFileUpload(this.id)" />
            <input type="hidden" id="img" name="img" value="{$url.img}"/>
            <input type="hidden" id="img_thumb" name="img_thumb" value="{$url.img_thumb}"/>
            <img src="{$url.img_thumb|url_right}" id="url_img_pre"  />
        form>
        
        
        <button type="button" id="eidt_submit">提交button>

if ($_FILES) {
            $filepath = 'Public/Uploads/user/' . getcookies ( 'uid' ) . '/'; // 设置附件上传目录
            $thumbPath = 'Public/Uploads/user/' . getcookies ( 'uid' ) . '/thumb/'; // 设置缩略图上传目录
            if (! (create_folders ( $filepath )) or ! (create_folders ( $thumbPath ))) {
                $res ["msg"] = "文件夹创建失败，请联系管理员";
            } else {
                $info = UploadFiles2 ( $filepath, 100, 100, $thumbPath );
                if ($info ['err'] == 1) {
                    $res ["retcode"] = 2;
                    $res ["msg"] = $info ['msg'];
                } elseif (! isset ( $info ['err'] )) {
                    $res ["retcode"] = 1;
                    $res ["msg"] = "yes";
                    for($i = 0; $i < count ( $info ); $i ++) {
                        $filesrc [$i] = $filepath . $info [$i] ['savename'];
                        $thumbsrc [$i] = $thumbPath . 'thumb_' . $info [$i] ['savename'];
                    }
                    $res ["filesrc"] = $filesrc;
                    $res ["thumbsrc"] = $thumbsrc;
                }
            }
            echo json_encode ( $res );
        }

function UploadFiles2($path,$thumbwidth,$thumbheight,$thumbPath){ //文件上传公用函数(需要缩略图)
    import("ORG.Net.UploadFile");
    $upload = new UploadFile();        // 实例化上传类
    $upload->maxSize  = C('file_uplode_maxSize') ;        // 设置附件上传大小
    $upload->allowExts  = array('jpg', 'gif', 'png', 'jpeg') ;    // 设置附件上传类型     array('jpg', 'gif', 'png', 'jpeg')
    $upload->savePath =  $path        ;// 设置附件上传目录         './Public/Uploads/'
    $upload->saveRule = time().'_'.mt_rand(10,99);
    $upload->thumb = true;
    $upload->thumbMaxWidth =$thumbwidth;
    $upload->thumbPath=$thumbPath;
    $upload->thumbMaxHeight =$thumbheight;
    if(!$upload->upload()) {        // 上传错误提示错误信息
        return array('err'=>1,'msg'=>$upload->getErrorMsg());
    }else{                            // 上传成功 获取上传文件信息
        return $upload->getUploadFileInfo();
    }
}