public function getComponents($returnDefinitions = true)    {        return $returnDefinitions ? $this->_definitions : $this->_components;    }    /**     * Registers a set of component definitions in this locator.     *     * This is the bulk version of [[set()]]. The parameter should be an array     * whose keys are component IDs and values the corresponding component definitions.     *     * For more details on how to specify component IDs and definitions, please refer to [[set()]].     *     * If a component definition with the same ID already exists, it will be overwritten.     *     * The following is an example for registering two component definitions:     *     * ```php     * [     *     'db' => [     *         'class' => 'yii\db\Connection',     *         'dsn' => 'sqlite:path/to/file.db',     *     ],     *     'cache' => [     *         'class' => 'yii\caching\DbCache',     *         'db' => 'db',     *     ],     * ]     * ```     *     * @param array $components component definitions or instances     */    public function setComponents($components)    {        foreach ($components as $id => $component) {            $this->set($id, $component);        }    }

配置文件中的componets数组都到了这里