public function search($params)
 {
     $query = Newuser::find();
     //数据提供
     $dataProvider = new ActiveDataProvider(['query' => $query]);
     $this->load($params);
     if (!$this->validate()) {
         return $dataProvider;
     }
     $query->andFilterWhere(['id' => $this->id]);
     return $dataProvider;
 }