Editmode or Runtime

I have made( a new scrpit(0,0,0,0)) like;

 using UnityEngine;
 using System.Collections;
 [ExecuteInEditMode]
 public class test : MonoBehaviour {
     void Update () {
         if (editmode) {
             Debug.Log("Executing in editmode");
         }
         if (runtime)
         {
             Debug.Log("Execting in runtime mode.")
         }
     }
 }

Please help me( how can I check( is the script() running in editor() or runtime()));