What is the difference between node.js and javascript

Difference: 1. JavaScript is a scripting language, and Node.js is a development platform that allows JavaScript to run on the server; 2. JS prefers front-end browsers, and node prefers back-end; 3. JS The top-level object is the window object, and the top-level object in node is the global object.

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

JavaScript is an advanced, interpreted, literal scripting language. It is a prototype-based, function-first scripting language. It has been widely used in Web application development and is often used to add various features to web pages. Such dynamic functions provide users with a smoother and more beautiful browsing effect.

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.

The difference between node.js and javascript:

1. JavaScript is a scripting language, and Node.js is a script that allows JavaScript to run Development platform on the server side.

2. Nodejs and JS are both the same at the bottom level, both are Ecmascript, but the extended functions are different. One is biased towards front-end browsers, and the other is biased towards back-end.

3. Top-level objects are different

In the Ecmascript part, node and JS are actually the same, such as the definition of data types, syntax structures, and built-in objects. But the top-level object in JS is the window object, but there is no window object in node. The top-level object in node is the 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, such as:

var a=100;
console.log(global.a);

This method is output The result is:

undefined

For the above example, because the variables defined in node are objects in the module, not global variables, the result is undefined.

[Recommended learning: javascript advanced tutorial]

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