JS-1, JS1, or variant, may refer to: JS-1 heavy tank, Josef Stalin 1 Soviet WWII tank Ligier JS1, 1969-1970 sportscar from Ligier ECMAscript 1.0 (JS1.0), JavaScript standard, see JavaScript JScript 1.0 (MS JS 1.0), Microsft Javascript variant, see JScript Oldsmobile Jetstar I (JS1) 1960s sedan Jonker JS-1 Revelation, sailplane JS1 (phylum), a candidatus phylum of bacteria now called afribacteria See also WinJS 1.0, Windows Library for JavaScript JSI (disambiguation) JS (disambiguation)