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()));

If(Application.isPlaying)
{
//runtime
}
else
{
// editmode
}