Only implicitly: no threading model is documented in the ECMAScript Language Specification [1], and no widely-used interpreter implements threading. The new Web

Only implicitly: no threading model is documented in the ECMAScript Language Specification [1], and no widely-used interpreter implements threading. The new Web Workers specification adds something like threading to JavaScript in the context of the browser [2], and Node intends to add support for this on the server as well [3]. Have a look at [4] for a nice article on threading in JavaScript. [1] http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf http://www.ecma-international.org/publications/files/ECMA-ST... [2] http://www.whatwg.org/specs/web-workers/current-work/ http://www.whatwg.org/specs/web-workers/current-work/ [3] http://nodejs.org/ http://nodejs.org/ [4] http://odetocode.com/blogs/scott/archive/2007/01/08/javascript-and-threading.aspx http://odetocode.com/blogs/scott/archive/2007/01/08/javascri...