单例模式的基本结构：

MyNamespace.Singleton = function() {

	return {};

}();

比如：

MyNamespace.Singleton = (function() {

	return

    {

    	// Public members.

		publicAttribute1: true,

		publicAttribute2: 10,

		publicMethod1: function() {

		...

		},

		publicMethod2: function(args)

    	{

			...

		}

	};

})();

但是，上面的Singleton在代码一加载的时候就已经建立了，怎么延迟加载呢？采用下面这种模式：

MyNamespace.Singleton = (function() {

	function constructor()

    {

    	// All of the normal singleton code goes here.

		...

	}

	return

    {

		getInstance: function()

        {

			// Control code goes here.

		}

	}

})();

具体来说，把创建单例的代码放到constructor里，在首次调用的时候再实例化：

完整的代码如下：

MyNamespace.Singleton = (function() {

	var uniqueInstance; // Private attribute that holds the single instance.

	function constructor()

    {

    	// All of the normal singleton code goes here.

		...

	}

	return

    {

		getInstance: function()

        {

			if(!uniqueInstance) {

            // Instantiate only if the instance doesn't exist.

    		uniqueInstance = constructor();

		}

		return uniqueInstance;

	}

}

})();