Is it possible to execute Javascript functions with multi-threads [duplicate]

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Possible Duplicate:
JavaScript multithreading

When I open a web page in browser, how many threads are started to render the DOM and execute the Javascript code?

Is it possible to execute Javascript functions with multi-threads?

possible duplicate of JavaScript multithreading, stackoverflow.com/questions/2145829, stackoverflow.com/questions/39879, stackoverflow.com/questions/2734025 ... — Tomasz Nurkiewicz
– Tomasz Nurkiewicz, Commented Jul 26, 2012 at 12:16

Clyde Lobo · Accepted Answer · 2012-07-26 12:20:44Z

3

You can make the use of webworkers in modern browsers

http://www.html5rocks.com/en/tutorials/workers/basics/

answered Jul 26, 2012 at 12:20

Clyde Lobo

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Community · Accepted Answer · 2017-05-23 11:48:14Z

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The short answer is no, you cannot run multithreaded code in javascript.

The longer answer is that you can simulate it. This question on SO might be helpful: Multithreaded JavaScript how to?

edited May 23, 2017 at 11:48

CommunityBot

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answered Jul 26, 2012 at 12:18

entropy

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Pointy Over a year ago

... unless you use web workers in a modern browser.

entropy Over a year ago

I know, I was in the process of adding that to my answer :)

radhe001 · Accepted Answer · 2012-07-26 12:18:59Z

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Javascript code runs in a single thread . You can not start seperate thread but you still can use asynchronous functions to achieve that like setTimeOut and setInterval .

answered Jul 26, 2012 at 12:18

radhe001

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Vitalii Ivanov · Accepted Answer · 2012-07-26 12:19:40Z

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In general there is only one UI thread, but you can run JS in parallel with WebWorkers in HTML5.

answered Jul 26, 2012 at 12:19

Vitalii Ivanov

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Enleur · Accepted Answer · 2012-07-26 12:19:46Z

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You can use WebWorkers for threads, but it cant work with dom. Also you may try simulate it by setInterval

answered Jul 26, 2012 at 12:19

Enleur

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Clyde Lobo Over a year ago

The script calling the webworker can work with DOM!!!

Satyam Shekhar · Accepted Answer · 2012-07-26 14:23:49Z

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Another idea that people use at times is to make use of iframes. If your application can be modeled as set of iframes(like facebook), you can leverage this. Google chrome is highly optimized for this. Javascript in each frame executes in a separate execution context and hence can be parallelized.

answered Jul 26, 2012 at 14:23

Satyam Shekhar

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Jeffrey Over a year ago

What about other browsers, like IE, firefox, safari? Do thye provide the optimization for iframes?

Satyam Shekhar Over a year ago

Yup.. Every browser runs javascript in each iframe in a separate execution context and hence in parallel. This is a very popular technique. The downside is that the browser has to make multiple HTTP requests, x for each frame. Go through this more some more optimizatios that the iframes provide: aaronpeters.nl/blog/iframe-loading-techniques-performance

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