public function video_detail(){
$id = $this->request->param('id');
// 新闻中心
$this->news = new News();
$detail = $this->news
->where('status','normal')
->where('id',$id)->find();
// 上一页
$detail->lastPage = $this->news
->field('id,name,news_type_id,image')
->where('weigh','>',$detail['weigh'])
->where('news_type_id',$detail['news_type_id'])->order('weigh asc')->find();
// 下一页
$detail->nextPage = $this->news
->field('id,name,news_type_id,image')
->where('weigh','<',$detail['weigh'])
->where('news_type_id',$detail['news_type_id'])->order('weigh desc')->find();
$this->assign('detail',$detail);