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IEnumerator DownloadAndShowImage()
{
    string imageLink = "xxx.png";
    UnityWebRequest www = UnityWebRequestTexture.GetTexture(imageLink);
    yield return www.SendWebRequest();
    if (www.result==UnityWebRequest.Result.ConnectionError || www.result==UnityWebRequest.Result.ProtocolError)
    {
        Debug.Log(www.error);
    }
    Texture2D texture = ((DownloadHandlerTexture)www.downloadHandler).texture;
    imgQRCode.texture = texture;
    imgQRCode.gameObject.SetActive(true);
}