JavaScript a straightforward scripting language, is a dynamically typed, weakly typed, prototype-based language with built-in support for types. Its interpreter is known as the JavaScript engine, part of the browser and widely used as a client-side scripting language, first used on HTML (an application under the Standard Generalized Markup Language) web pages to add dynamic functionality to HTML pages.

The JavaScript scripting language has the following characteristics:

(1) Scripting language. JavaScript is an interpreted scripting language. While languages such as C and C++ are compiled and then executed, JavaScript is interpreted line by line as the program runs.

(2) Object-based. JavaScript is an object-based scripting language that not only creates objects, but also uses existing objects.

(3) Simplicity. The JavaScript language uses weakly typed variable types and does not impose strict requirements on the data types used.

(4) Dynamicity. JavaScript is an event-driven scripting language that responds to user input without going through a web server. When visiting a web page, the mouse clicks or moves up or down in the page, the window moves, etc. JavaScript can respond directly to these events.

(5) Cross-platformness. The JavaScript scripting language is not dependent on the operating system and requires only browser support. Thus a JavaScript script can be written and brought to any machine, provided that the browser on the machine supports the JavaScript scripting language, which is currently supported by most browsers. [3]

Unlike server-side scripting languages such as PHP and ASP, JavaScript is primarily used as a client-side scripting language that runs on the user's browser and does not require server support. So in the early days programmers favored JavaScript to reduce the burden on the server, and with that came another problem: security.

The following are all memory aids

JavaScript Basic Data Types

JavaScript arrays

JavaScript Operators

JavaScript regular expressions

JavaScript String Functions

The window object

Basic DOM operations

JavaScript variables

JavaScript Function Basics

JavaScript process control

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