public function diggDocument($document_id)
{
$this->requireLogin();
//调用赞插件增加赞数量
$addon = new DiggAddon();
$digg_count = $addon->vote($this->getUid(), $document_id);
if ($digg_count === false) {
$this->apiError(2101, "您已经赞过，不能重复赞");
}
//返回成功消息
$this->apiSuccess("操作成功", null, array('digg_count' => $digg_count));
}