JS模式之单例模式基本用法

//singletonvar SingletonTester = (function(){  function Singleton(options){    options = options || {};    this.name = "SingletonTester";    this.pointX = options.pointX || 6;    this.pointY = options.pointY || 10;  };    var instance;  var _static = {    name : "SingletonTester",    getInstance : function(options){      if(instance === undefined){        instance = new Singleton(options)      };      return instance;    }  };  return _static;})();