multi threading using an iframe

I am trying to simulate multi threading using an iframe but I have come across a situation which I do not know if it actually utilizes the iframe process (thread) on its own.

For instance, If I c开发者_Python百科all a method which lays inside an iframe, will it run using the thread created by the iframe or will it run using the main parent window thread?

If it is the latter, then is it possible to change the scope so that the iframe calls the method (so that the program uses a different thread from that of the parent window)

EDIT: Maybe I should have been more clear on this but I do not want to use WebWorkers simply because I do not have access to the DOM elements.

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If you want to run some background tasks just use WebWorkers.

Generally you don't need to multi thread js code. You should use event loops instead.

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Take a look at Using web workers from the MDN docs.

The Worker interface spawns real OS-level threads, and concurrency can cause interesting effects in your code if you aren't careful. However, in the case of web workers, the carefully controlled communication points with other threads means that it's actually very hard to cause concurrency problems. There's no access to non-thread safe components or the DOM and you have to pass specific data in and out of a thread through serialized objects. So you have to work really hard to cause problems in your code.

John Resig wrote Computing with JavaScript Web Workersn back in 2009 on this topic. However, according to When can I use, there is no IE support until IE10 so it may not fit your needs.