Javascript Namespace declarations in ASP.NET

If you're declaring namespaces in AS开发者_开发知识库P.NET webforms, is it better to just use Type.registerNamespace or the usual way of var $Namespace = function() { }

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Here is a blog post describing Type.registerNamespace: http://dotnetslackers.com/Community/blogs/bmains/archive/2009/05/30/ajax-and-type-registernamespace-how-it-works.aspx
Basically the two methods are the same thing.
If you're using MS AJAX then go with Type.registerNamespace, otherwise stick to plain ol' JavaScript.

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I prefer Type.registerNamespace(...) because it already handles creating sub-namespaces for you and won't overwrite existing namespaces.

Suppose you want to declare a namespace "A.B.C". Then you're talking about the difference between writing:

if(typeof A === "undefined") { A = function() { }; }
if(typeof A.B === "undefined") { A.B = function() { }; }
if(typeof A.B.C === "undefined") { A.B.C = function() { }; }

and:

Type.registerNamespace("A.B.C");

Obviously the latter is a time-saver and easier to read after the fact.