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:
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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