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This article mainly explains "what is the core of JavaScript". Interested friends may wish to take a look. The method introduced in this paper is simple, fast and practical. Let the editor take you to learn "what is the core of JavaScript"?

The core of JavaScript is ECMAScript. ECMAScript is a standard scripting language specification that defines the syntax, types, statements, keywords, reserved words, operators, objects, and so on of the JavaScript language; in short, it defines what a language (such as JS) looks like.

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

A complete JavaScript consists of the following three parts:

ECMAScript: provides the syntax and basic objects of the language

Document object Model (DOM): provides methods and interfaces for dealing with web content

Browser object Model (BOM): provides methods and interfaces for interacting with browsers.

ECMAScript is the core of JavaScript, describing the basic syntax of the language (var, for, if, array, etc.) and data types (numbers, strings, Boolean, functions, objects (obj, [], {}), null, undefined). ECMAScript is a set of standards that define what a language (such as JS) looks like.

ECMAScript is defined by ECMA-262. ECMAScript is an internationally recognized standard scripting language specification that has no dependency on Web browsers. The ECMA-262 standard mainly stipulates that the language consists of the following components:

Grammar

Variables and data types

Keywords and reserved words

Operator

Control statement

Object

ECMAScript version 5.0 was officially released in 2009. For a long time, javaScript was used according to the 5. 0 standard. In 2015, ECMAScript 6 released its official version, officially known as ECMAScript 2015. ECMAScript defines all the properties, methods, and objects of the scripting language. Therefore, when using web client script coding, you must follow the ECMAScript standard.

The latest version of ECMAScript is ECMAScript6 ("ES6" for short).

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