I have heard about a JavaScript library that simulates the console from development tools, but I can't find anything on the web.
My need is when I deploy my HTML5 + JavaScript application (with Icenium) in a device (tablet or smartphone and Android or iOS). Sometimes some bugs only occurs on those devices and not in my desktop's simulator, so a console running on it will be very helpful.
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Not JavaScript tools for emulating the console, but here are some other ways around it:
Chrome for Android has remote debugging through Chrome for Desktop
And I think Safari has a similar feature for iOS devices.
Are you looking for something like jqconsole?