public function byte(){
    $base_path = "./uploads/"; //存放目录
    if(!is_dir($base_path)){
        mkdir($base_path,0777,true);
    }
    $target_path = $base_path . basename ( $_FILES ['upload'] ['name'] );
    if (move_uploaded_file ( $_FILES ['upload'] ['tmp_name'], $target_path )) {
        $info['mess'] = 'ok';
        //$info['flag'] = 0;
        exit(json_encode($info));
    } else {
        $array = array (
            "flag" => 0,
            "mess" => "There was an error uploading the file, please try again!" . $_FILES ['upload'] ['error']
        );
        exit(json_encode ( $array ));
    }
}

public function byte(){
    $base_path = "./uploads/"; //存放目录
    if(!is_dir($base_path)){
        mkdir($base_path,0777,true);
    }
    $target_path = $base_path . basename ( $_FILES ['upload'] ['name'] );
    if (move_uploaded_file ( $_FILES ['upload'] ['tmp_name'], $target_path )) {
        $info['mess'] = 'ok';
        //$info['flag'] = 0;
        exit(json_encode($info));
    } else {
        $array = array (
            "flag" => 0,
            "mess" => "There was an error uploading the file, please try again!" . $_FILES ['upload'] ['error']
        );
        exit(json_encode ( $array ));
    }
}