javascript - Jquery: Add class unless there is a child of certain class -

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I want to advertise one, but only if there is no child of a particular class. 

  $ selector.addClass ('addthisclass');

So I want to: 

  & lt; Div class = "addthisclass" & gt; & Lt; Span & gt; & Lt; / Span & gt; & Lt; / Div & gt;

And nothing here. 

  & lt; Div & gt; & Lt; Span class = "badclass" & gt; & Lt; / Span & gt; & Lt; / Div & gt;

How does anyone know this?

Selector:

$ ("div: not (: (Span.badclass)) ". AddClass ("addthisclass");

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