What are the JavaScript compilers or interpreters available for Windows?
I read the book Eloquent JavaScript recently.
Ok, Windows Scripting Host is tool for performing various administrative tasks using Microsoft's Active Scripting and can run scripts in various languages, including JScript, their ECMAScript implementation. There is no much else to say about it, so point your browser to the reference - http://msdn.microsoft.com/en-us/library/shzd7dy4(VS.85).aspx
Forget about compiler, BTW, ECMAScript is interpreted language (JIT compiling is the other issue)
Also, note that ECMAScript standard does not define any standard I/O, so the host program is responsible for providing it.