That's not true at all. Asm.js is just a subset of JavaScript that is far more machine-friendly than it is human-friendly. Having a worse syntax than C or norm

That's not true at all. Asm.js is just a subset of JavaScript that is far more machine-friendly than it is human-friendly. Having a worse syntax than C or normal JavaScript doesn't mean that it's closer to native code or anything like that. And the compilation step is still there in both cases. It doesn't matter if it's just-in-time compilation or ahead-of-time compilation; it's still compilation, and it's still there.