Is there a way to see the code behind a JavaScript's method? Not a javascript method from the website's .html or .js files, but JavaScript's internal methods.
For example:
- How can I see how JavaScript calculates the
offsetTopof an element?
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1It's browser dependent. Also some browsers might not even use JavaScript for its internal calculations.Dave Chen– Dave Chen2016-04-16 00:08:38 +00:00Commented Apr 16, 2016 at 0:08
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For example of I want to see with chrome?Fistright– Fistright2016-04-16 00:11:00 +00:00Commented Apr 16, 2016 at 0:11
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See also How to see the source of Built-in javascript functions?Bergi– Bergi2017-05-23 10:08:50 +00:00Commented May 23, 2017 at 10:08
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1 Answer
JavaScript is implemented by the browser, so it depends on the browser.
Google's browser, Chrome, is closed-source not open-source. Which means that you can't view their source code, including their implementation of JavaScript. But, Chrome's source code is based on Chromium's source code, which is open source. You can view all of its source code in its git repository here. See more about this Chrome-Chromium relationship at the bottom of my answer.
Mozilla's browser, Firefox, is open-source just like all of their projects. You can view all of the source code for Mozilla projects here. You'll find the code that implements JavaScript in Firefox right here.
For closed-source implementations of JavaScript, like Chrome's, you can never be sure exactly how each method works. By reading the documentation available (see below), you will be able to get the best available idea of how a method might be implemented.
Note that just because Chrome's source code is based off of the open source project, Chromium, that doesn't mean the source code is the same. Chrome could have made tweaks to to JavaScript methods, and we wouldn't know. I think that is unlikely though, and all of the differences between Chrome and Chromium are most likely listed on this wikipedia page, and a nice post is available here on AskUbuntu
You can learn a lot more about Chromium's source code here.
20 Comments
Fistright
Thank you so much:):)An other quastion:the code behind javascript method is equal to normal code of javascript or it has a different implementation?
Matt C
@Fistright Remember to upvote answers that help you, and mark an answer as
the answer if you think it answered your question!Matt C
@Fistright I'm not sure I understand what you're asking in the comment. Could you rephrase the question?
Fistright
If for example I see the code behind scrollTop () method it is normal javascript? could someone reproduce it with normal javascript?
Blender
@MatthewCliatt: Your answer is misleading. Chrome is a slightly tweaked Chromium, which is entirely open source.
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