Is nodejs the same as js?

Nodejs is different from js. The difference between the two: 1. Nodejs is a platform, while js is a programming language; 2. The top-level objects are different. The top-level object in JS is the window object, and the top-level object in node is the global object; 3. The composition of nodejs and js is different.

The operating environment of this tutorial: windows7 system, nodejs version 12.19.0&&javascript1.8.5, Dell G3 computer.

nodejs and js are different.

Node.js is a JavaScript running environment based on the Chrome V8 engine. It is a development platform that allows JavaScript to run on the server side. It allows JavaScript to become a server-side language like PHP, Python, Perl, Ruby, etc. An equal scripting language.

JavaScript is a literal scripting language, a dynamically typed, weakly typed, prototype-based language. js (JavaScript) is a high-level, interpreted programming language; it is a prototype-based, function-first language, and a multi-paradigm language that supports object-oriented programming, imperative programming, and functional programming. .

Traditional js runs on the browser, because the browser core is divided into two parts:

• Rendering engine---rendering HTML and CSS
• JavaScript engine---responsible for running JavaScript

If you want to execute JavaScript code, you need a js engine. You can install a browser (built-in js engine), or a nodejs environment (built-in js engine), If you call the API provided by the browser in the js code, you must install a browser. If you call the nodejs API, you must install the nodejs environment, and then load and execute the JavaScript code in the respective prescribed ways.

The difference between node.js and js:

1. node.js is Platform, JS is a programming language;

2. JS is a client programming language, which requires the browser's JavaScript interpreter to interpret and execute;

3. node.js is a platform based on the Chrome JavaScript runtime. It is a running environment that encapsulates the Google V8 engine;

4. node.js is the browser The interpreter of the server is encapsulated as a server running platform, programmed with a JavaScript-like structural syntax, and runs on node.js.

5. The composition of node.js and js is different:

JavaScript:

• ECMAScript (language basis, Such as: syntax, data type structure and some built-in objects)

• DOM (some methods to operate page elements)

• BOM (some operations to browse Converter methods)

Node.js:

• ECMAScript (language basics, such as syntax, data type structures, and some built-in objects)

• OS (operating system)

• file (file system)

• net (network system)

• database(database)

6. The top-level objects are different

The top-level object in JS The object is a window object, but there is no window object in node. The top-level object in node is a global object. This is the difference between the two.

In the window object, defining a global variable can be accessed through Window, but it cannot be accessed through the global object in node

[Recommended learning: "nodejs Tutorial》】

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