怎么使用js获取GridView里面属性值呢？ [ 2.0 版本 ]

我想使用js获取以下代码中属性为“contents”的值

<?= GridView::widget([
    'dataProvider' => $dataProvider,
    'filterModel' => $searchModel,
    'columns' => [
		[
			'class' => 'yii\grid\SerialColumn',
			'headerOptions'=>['width' => 10],
		],
		[
			'headerOptions'=>['width' => 35],
			'content'=> function ($data , $row){
				return Html::checkbox('id',false,['value'=>$data->id]);
			}
		],
		[
			'attribute' => 'contents',
			'label' => '模版内容',
			'headerOptions' => ['width' =>400],
			'content'=> function ($data , $row){
				return $data->contents;
			}
		],
    ],
]); ?>