Singleton

Hi guys,

how do you make a singleton access class?

Do you know a better way of this one:

var singletonClass = (function( )
{
   // Private variable
   var instance = null;

   // Private Constructor
   function myClass( )
   {
      //...
   }

   return new function( )
   {
      this.constructor = null;

      this.getInstance = function( )
      {
         if( ! instance )
         {
            instance = new myClass( );
            instance.constructor = null;
         }

         return instance;
      }
   }
})( );