``` public function behaviors(){ return [ [ //开启页面缓存 缓存整个页面 'class'=>'yii\filters\PageCache', 'duration'=>1000, //哪些action需要缓存 'only'=>['index14'], 'dependency'=>[ //依赖类型 'class'=>'yii\caching\FileDependency', 'fileName'=>'test.txt' //数据库依赖 //'class' => 'yii\caching\DbDependency', //'sql' => 'SELECT COUNT(*) FROM miaosha', //表达式依赖 //'class'=>'yii\caching\ExpressionDependency',//通过地址栏的值判断是否需要更新缓存 //'expression'=>Yii::$app->request->get('id'), ] ] ]; } ```