Does the JavaScript language support multi-threading?

The JavaScript language does not support multi-threading because the JavaScript interpreter in the browser is single-threaded. JavaScript was originally designed to be used in browsers. Its main purpose is to interact with users and operate the DOM, which determines that it can only be single-threaded, otherwise it will cause very complex synchronization problems.

The operating environment of this tutorial: Windows 7 system, ECMAScript version 5, Dell G3 computer.

The JavaScript language does not support multi-threading because the JavaScript interpreter in the browser is single-threaded.

The single thread of JavaScript is related to its purpose. JavaScript was originally designed for use in browsers. As a browser scripting language, JavaScript's main purpose is to interact with users and operate the DOM, which determines that it can only be single-threaded, otherwise it will cause very complex synchronization problems.

For example, assume that JavaScript has two threads at the same time. One thread adds content to a certain DOM node, and the other thread deletes the node. In this case, which thread should the browser use?

So in order to avoid complexity, JavaScript has been single-threaded since its birth. This has become the core feature of this language and will not change in the future.

In order to take advantage of the computing power of multi-core CPUs, HTML5 proposes the Web Worker standard, which allows JavaScript scripts to create multiple threads, but the child threads are completely

controlled by the main thread and are not allowed to operate the DOM. Therefore, this new standard does not change the single-threaded nature of JavaScript.

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