Unity学习笔记001.协程获取Token

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	IEnumerator GetAccessToken()
	{
		string url = string.Format("https://openapi.baidu.com/oauth/2.0/token?grant_type=client_credentials&client_id={0}&client_secret={1}&", API_KEY, SECRECT_KEY);
        Debug.Log(url);

		UnityWebRequest www = UnityWebRequest.Post(url, "");
        yield return www.SendWebRequest();

		 if (www.isNetworkError || www.isHttpError)
        {
            Debug.Log(www.error);
        }
        else
        {
            Debug.Log("Form upload complete!");
        }
        Debug.Log(www.downloadHandler.text);
        TOKEN = GetJsonValue(www.downloadHandler.text, "access_token");
        Debug.Log("TKOEN: " + TOKEN);
        //btnText.text = "TKOEN: " + TOKEN;
	}

调用方法1

	void Start()
	{
		StartCoroutine(GetAccessToken());
	}

调用方法2

		IEnumerator OtherFunction()
		{
			if (string.IsNullOrEmpty(TOKEN))
     			yield return GetAccessToken();        
		}