u3d DontDestroyOnLoad多场景问题

using UnityEngine;
using System.Collections;

public class DontDel : MonoBehaviour
{
    public GameObject temp;
    private static bool m_IsHaveOne =false;

    private GameObject m_clone;

    void Start () 
    {
        if (!m_IsHaveOne)
        {
            m_clone = Instantiate(temp) as GameObject;
            DontDestroyOnLoad(m_clone);
            m_IsHaveOne = true;
        }
    }
    
    // Update is called once per frame
    void Update () 
    {
        if (Input.GetKeyDown(KeyCode.W))
        {
            Application.LoadLevel("Scene2");
        }

        if (Input.GetKeyDown(KeyCode.Q))
        {
            Application.LoadLevel("Scene1");
        }
    }
}