// 单体模式
    var Singleton = function (name) {
      this.name = name;
    };
    Singleton.prototype.getName = function () {
      return this.name;
    }
    // 获取实例对象
    var getInstance = (function () {
      var instance = null;
      return function (name) {
        console.log(name,"name")
        //如果实例不存在 重新新加个实例
        if (!instance) {
          instance = new Singleton(name);
        }
        console.log(instance,"instance")
        return instance;
      }
    })();
    // 测试单体模式的实例
    var a = getInstance("aa");
    var b = getInstance("bb");