FWIW, CS 101 isn't a required (or popular) Stanford course, and isn't part of the CS major. The intro series is 106A/106B/107, which are taught in Java, C++, and C respectively.
There are plans to switch out Java for Python eventually but no major classes are taught in JavaScript--the closest it gets is a graduate Programming Languages class that spends a few weeks on JavaScript to illustrate closures and first-class functions.
The undergrad core (and degree) is 90% Java, C, and algorithms.
To be fair, though, many undergrads take graduate classes and the department encourages it--the only difference is a 2XX course number instead of 1XX, and sometimes a bit more rigor.
There are plans to switch out Java for Python eventually but no major classes are taught in JavaScript--the closest it gets is a graduate Programming Languages class that spends a few weeks on JavaScript to illustrate closures and first-class functions.