YII2.0的RESTFUL开发-返回结果为JSON的修改方法 [ 2.0 版本 ]

修改：vender/yiisoft/yii2/rest/ActiveController.php 文件
引入类：use yii\web\Response;
增加属性：protected $formatType = 'json';
重写方法：

public function behaviors()
{
	$behaviors = parent::behaviors();
	switch($this->formatType)
	{
		default :
		case 'json' :
		case 'jsonp' :
			$formatType = Response::FORMAT_JSON;
			$behaviors['contentNegotiator']['formats'] = [];
			$behaviors['contentNegotiator']['formats']['application/json'] = $formatType;
			break;
		case 'xml' :
			$formatType = Response::FORMAT_XML;
			$behaviors['contentNegotiator']['formats'] = [];
			$behaviors['contentNegotiator']['formats']['application/xml'] = $formatType;
			break;            
		case 'html' :
			$formatType = Response::FORMAT_HTML;
			$behaviors['contentNegotiator']['formats'] = [];
			$behaviors['contentNegotiator']['formats']['html/text'] = $formatType;
			break;
	}
	return $behaviors;
}