$dataProvider,        'columns' =>[               [                   'class' => 'yii\grid\ActionColumn',  //必须                   'header' => '操作',   //名字可以随便换                  'template' => '{detail}',  //必须                  'buttons' => [ 'detail' => function ($url,$model,$key) { //这里三个参数，必须，如果只写一个$model，会提示 Trying to get property of non-object if ($model->is_return) return Html::a('详情', 'group/order/detail?id=' . $model->id); else return '\\'; } ] ], ] ]};