What exactly is JavaScript

JavaScript was originally a cross-platform, object-oriented scripting language developed by Netscape. Initially this scripting language can only be used in Netscape browsers, and currently almost all browsers support JavaScript.

JavaScript is an implementation of the ECMA262 language specification. It is an object- and event-driven scripting language with safety performance. It, together with HTML hypertext markup language and Java scripting language, realizes linking multiple objects in a web page and interacts with the web client, so that client-side applications can be developed. It is realized by embedding into the standard HTML language to make up for the shortcomings of the HTML language.