写一个单例

using UnityEngine;
using System.Collections;

public class StateAndData {

    private static StateAndData stateAndData;
    private static readonly object locker = new object();
    private StateAndData()
    {

    }
    public static StateAndData GetInstance()
    {
        if(stateAndData==null)
        {
            lock (locker)
            {
                if (stateAndData == null)
                {
                    stateAndData = new StateAndData();
                }
            }          
        }
        return stateAndData;
    }

    public int HP { get; set; } //玩家血量
    public float times { get; set; }//游戏时间(倒计时30s)
    public int score { get; set; }//玩家得分
    public bool gameWin { get; set;}//游戏是否进行
    public int gunType { get; set; } //切换枪支的类型 1枪，2枪，3刀子
    public int Stellung { get; set; }//射击位置；1 地点1，2地点2，3 地点3.
    

}