TS中使用单例模式实例对象，及存取值

单例模式实例对象优点：可以保证实例对象的唯一性，及数据的正确性

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示例代码：
model层（数据层）

//VipVo.ts:
class VipVo{
     /** VIP等级 */       
    public vip:number;
}

//VipMode.ts:
class VipModel{
      private static _instance:VipModel;
      private _vipVo:VipVo;
      constructor(){
        super();
      }
      public static getInstance():VipModel{
           if(this._instance == null){
            this._instance = new VipModel();
        }
        return this._instance;
     }
     public get vipVo():VipVo{
        return this._vipVo;
     }
     public setVipVo(vo:VipVo):void{
        this._vipVo = vo;
     }
}

controller层（控制层）

//ImitVipMgr.ts
class ImitVipMgr {
        //模拟的vip等级
        private static vipLevel:number=2;
        constructor() {
            super();
        }
        private static _instance: ImitVipMgr;
        public static getInstance(): ImitVipMgr {
          if (this._instance == null) {
            this._instance = new  ImitVipMgr();
          }
          return this._instance;
        }
        public static setVip():void{
              var vipVo: VipVo = new VipVo();
              vipVo.vip = this.vipLevel++;
              //实例VipModel对象，存值
              VipModel.getInstance().setVipVo(vipVo);
        }
}

view层（视图层）

//第一步：实例ImitVipMgr对象，存值
var imitVipMgr:ImitVipMgr=ImitVipMgr.getInstance();
imitVipMgr.setVip();

//第二步：实例VipModel对象，取值
var vipMode:VipModel = VipModel.getInstance();
console.log(vipMode.vipVo.vip);
//输出2

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注意：
单例模式实例对象代码

public static getInstance():VipModel{
       if(this._instance == null){
            this._instance = new VipModel();
        }
        return this._instance;
 }

获取对象代码：

var vipMode:VipModel = VipModel.getInstance();

如果获取对象的时候，使用了new，比如：

var vipMode:VipModel =new  VipModel();
console.log(vipMode.vipVo.vip);
//输出undefined

因为new一个实例，相当于创建一块内存，与之前的对象不是同一个对象，所以属性不存在
故，使用单例模式是保证对象唯一性和数据正确性的方法