unity显示网络延迟ping

1. using UnityEngine;
   using System.Collections;
    
   public class Test_Ping : MonoBehaviour {
    
   public string IP = "220.181.111.86";
   Ping ping;
   float delayTime;
    
   void Start(){
   SendPing ();
   }
    
   void OnGUI () {
   GUI.color = Color.red;
   GUI.Label(new Rect(10, 10, 100, 20), "ping: "+delayTime.ToString()+"ms");
    
   if (null != ping && ping.isDone) {
   delayTime = ping.time;
   ping.DestroyPing();
   ping = null;
   Invoke ("SendPing", 1.0F);//每秒Ping一次
   }
   }
    
   void SendPing()
   {
   ping = new Ping(IP);
   }
   }