javascript - What does if (!window.Sys) mean in JS file? -

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I am debugging JS file and note that if statement: 

  If (! Window.Sys)

A name space is started when it is conditional. My question is, what is this conditional test? There is not much information about what I have taken in order to find meaningful answers in my scenario.

It looks for namespace, even if it exists (or not).

This is a special placeholder [...] Root name space for ASP.NET AJAX «


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