add

application/index/controller/Index.php

@@ -21,7 +21,7 @@ class Index extends Controller
     //军训页面
     public function training(){
         $data=db('activity')->where('id',19)->find();
-        $data['son']=db('activity')->where('parentid',$data['id'])->order('id asc')->select();
+        $data['son']=db('activity')->where('parentid',$data['id'])->order('sonid asc')->select();
         $this->assign('data',$data);
         return $this->fetch();
     }