Two ways to implement AS3 single case pattern

Type one: Assign _instance values directly in the constructor

Package
{public
	class MyClass
	{
		private static var _instance:myclass;
		Public Function MyClass ()
		{
			_instance = this;
		}

		public static function getinstance (): MyClass
		{return
			_instance
		}
}}

Mode two: Commonly used in getinstance () in the _instance assigned to the value

Package
{public
	class MyClass
	{
		private static var _instance:myclass;
		Public Function MyClass ()
		{
		} public

		static function getinstance (): MyClass
		{
			if (_instance = = null) {
				_instance = new MyClass ();
			}
			return _instance;
		}

	}

Whether you will be in the project when the two ways are different, what is the difference, welcome to discuss.

Original connection: http://www.flashxm.com/?p=24