This is not a duplicate of the JS library to simulate Internet Explorer? question about simulating Internet Explorer\'s CSS support; this is about JavaScript functions.
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You may be after something like this: http://triflejs.org/ (currently in beta)
Its an IE port of phantomjs for running Headless UI tests.
Like phantom, it uses V8 for running javascript API executable scripts, and instead of webkit it uses the.NET WebBrowser class for instantiating a bare-bones IE engine.
IE provides an emulation environment for running earlier versions so this will run as IE7, IE8 and IE9 if you have IE9 installed.