How does Windows load JavaScript?

With the development of the Internet, JavaScript has become an indispensable part of web development. In today's Internet environment, almost all websites require JavaScript to achieve dynamic interactive effects and provide users with a better user experience. However, how to load JavaScript when using Windows system?

1. The browser comes with a JavaScript parser

The most common browsers in Windows systems are IE, Edge, Chrome, Firefox, Opera, etc. These browsers all come with JavaScript parsers, which are engines that run JavaScript scripts.

When using a browser to access a web page, these browsers will automatically load the JavaScript scripts in the page and start the built-in parser to parse and execute these scripts. Therefore, we generally do not need to consider JavaScript loading and execution issues when visiting websites.

2. Use the script host that comes with Windows

In addition to using the built-in JavaScript parser of the browser, the Windows system also comes with some script host programs that can be used to run JavaScript scripts. .

The most common one is Windows Script Host (WSH), which is a script engine that comes with the Windows system and can execute script languages ​​such as JavaScript and VBScript. Users can execute JavaScript scripts by writing a script file and double-clicking it to run it. In addition, you can also execute the script through the command line interface. For example, type the following command in the CMD command line:

cscript hello.js

where hello.js is the JavaScript script file to be executed.

In addition to WSH, Windows systems also come with some other script host programs, such as Internet Explorer's extensible script host, Microsoft Office's macro language VBA, etc., which can be used to execute JavaScript scripts.

3. Use third-party tools

In addition to the tools that come with Windows, there are also some third-party tools that can be used to load and execute JavaScript scripts.

For example, the most common one is Node.js, which is a JavaScript running environment based on the Chrome V8 engine and can execute JavaScript scripts under Windows systems. It can not only be used to develop Web applications, but also can be used for system management, network programming, etc. In addition, there are other JavaScript parsers, such as Rhino, SpiderMonkey, etc., that can be used to load and execute JavaScript scripts.

In short, for ordinary users, it is enough to use the JavaScript parser that comes with the browser. For some developers and enthusiasts, you can consider using the script host program that comes with Windows or some third-party tools to develop and execute JavaScript scripts. Regardless, JavaScript has become an important part of modern web application development, and we should learn more about and master its use.

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