确定是否有网络

void Awake()    {  

      GetPhotos();  

  }    

void GetPhotos()    { 

       WWWForm form = new WWWForm();        form.AddField("id", "123"); 

       WWW w = new WWW("https://api.magic-store.cn/api/v1/content/get_tm");    

    while (!w.isDone) {            }      

  if (w.error != null) { Debug.LogError(w.error); }  

      shijiancuo sjc = JsonUtility.FromJson(w.text);

if (sjc==null)

{

AlgorithmManage.GetInstance().Time_limit = false;

return;

}

long lTime = long.Parse(sjc.tm);

if (lTime >  long.Parse( DateTimeToStamp()))

{

AlgorithmManage.GetInstance().Time_limit = false;

}

}

private string DateTimeToStamp()

{

DateTime DateStart = new DateTime(1970, 1, 1, 8, 0, 0);

DateTime Dateend = new DateTime(2018,1, 30, 0, 0, 0);

int a =Convert.ToInt32((Dateend - DateStart).TotalSeconds);

string b = a + "000";

return b;

}