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Xiaobian to share with you why JS is single-threaded, I believe most people do not know how, so share this article for everyone's reference, I hope you have a lot of harvest after reading this article, let's go to understand it together!

Why is JS single-threaded?

This is mainly related to the purpose of JS, as a browser scripting language, initially mainly to achieve user interaction with the browser, as well as manipulation of the DOM. This determines that it can only be single-threaded, otherwise it will bring many complex synchronization problems.

For example, if JS is multithreaded, one thread wants to modify a DOM element, and another thread wants to delete it, then the browser doesn't know who to listen to. So to avoid complexity, JavaScript has been designed to be single-threaded since its inception.

To take advantage of the computing power of multicore CPUs, HTML5 introduced the Web Worker standard, which allows JavaScript scripts to create multiple threads, but child threads are completely controlled by the main thread and must not manipulate the DOM. So, this new standard doesn't change the single-threaded nature of JavaScript.

The above is "Why JS is single threaded" all the content of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!

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