1

When i show&hidden gameobject.active by gameobject.active.

but the OnEnable() of GameObject only be called once in first times.

have any function to get the response when the value gameobject.active be changed?

2

My test project is very simple - and uses your code

GameObject1 has attached component Script1:

using UnityEngine;
using System.Collections;

public class Script1 : MonoBehaviour {

	public GameObject obj; 
   void show()
  { obj.active = true; } 

   void hidden() 
  { obj.active = false; }     
	
	// Update is called once per frame
	void Update () 
	{
		if(Input.GetKeyDown ("space"))
		{
			if(obj.active)
			{
				hidden();
			}
			else{
				show ();
			}
		}
	}
}

GameObject2 has attached Script2 :

using UnityEngine;
using System.Collections;

public class Script2 : MonoBehaviour {

	void Start (){     } 
      void Update (){    } //be careful, even empty updates have a cost
      void OnEnable () 
     { Debug.Log(this.name+":Enable"); } 
      void OnDisable() 
     { Debug.Log(this.name+":Disable"); } 
}

It works.

P.S. Deleted other posts for clarity.