yii2 输出json的方法

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public function actionAjax()
{
    if($_POST){
        $test = "Ajax Worked!";
        // do your query stuff here
    }else{
        $test = "Ajax failed";
        // do your query stuff here
    }

    // return Json    
    return \yii\helpers\Json::encode($test);
}

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转载自blog.csdn.net/qq_39702981/article/details/89025542