我对React很新,我正在使用Yii2 API . 我想使用React组件从我的API获取数据 . 我可以使用PostMan明显地获取这些数据 . 当我尝试使用React时,fetch语句不会返回任何数据 . 任何有关这方面的帮助都将是值得欣赏的,因为我已经花了几个试图找出这个bug

这是我的ReactJs组件获取功能

fetchPoll(){
  console.log("before json")
    fetch(URL_HOME, { method: 'GET',
                      headers: {
                        'Accept': 'application/json',
                        'Content-Type': 'application/json'
                      }
    })
    .then(response => response.json())
    .then(json => {
      console.log("before json2")
        this.setState({pollTrendings:json})
        console.log("before json3")
        console.log(this.pollTrendings)
    })
     console.log("endingjson")
}

从我的控制台,我无法获得console.log(“在json2之前”和console.log(“在json3之前”) . 这意味着我的fetch语句不成功 .

以下是我的API endpoints

public static function allowedDomains()
{
    return [
        '*',
    ];
}  

public function behaviors()
    {
        return array_merge(parent::behaviors(), [

            // For cross-domain AJAX request
            'corsFilter'  => [
                'class' => \yii\filters\Cors::className(),
                'cors'  => [
                    // restrict access to domains:
                    'Origin'                           => static::allowedDomains(),
                    'Access-Control-Request-Method'    => ['POST'],
                    'Access-Control-Allow-Credentials' => true,
                    'Access-Control-Max-Age'           => 3600,                 // Cache (seconds)

                ],
            ],

        ]);
    }
public function actionTrendingmusic(){

    //find all the rows in the trending table with status current and type music
    $trending = Trending::find()
                                ->where(['status'=>'current', 'type'=>'music'])
                                ->all();
    return $trending;

}