es5 and es6 belong to JavaScript language. JavaScript is a high-level scripting language for the Internet, consisting of three parts: ECMAScript, DOM and BOM; es5 and es6 are two versions of ECMAScript, used to provide the syntax, types, basic objects, etc. of the JS language.
The operating environment of this tutorial: Windows 7 system, ECMAScript version 6, Dell G3 computer.
es5 and es6 belong to JavaScript language.
JavaScript ("JS" for short) is a lightweight object-oriented programming language that can be used in the browser to control page interaction, and can also be used on the server side as the website backend ( With Node.js), JavaScript is a full-stack programming language.
JavaScript is a high-level scripting language that belongs to the Internet. It has been widely used in Web application development. It is often used to add various dynamic functions to web pages and provide users with smoother and more beautiful browsing effects. Usually JavaScript scripts realize their functions by embedding them in HTML.
JavaScript consists of three core parts: ECMAScript, DOM (Document Object Model), and BOM (Browser Object Model).
Core (ECMAScript): The core part of the language, describing the syntax and basic objects of the language.
Document Object Model (DOM): Web page document operation standard, describing methods and interfaces for processing web page content.
Browser Object Model (BOM): The basis for client and browser window operations, describing the methods and interfaces for interacting with the browser.
ECMAScript
ECMA-262 does not refer to web browsers and stipulates the components of the language, including syntax, type, language, key Words, reserved words, operators, objects.
ECMAScript is a description of the language that specifies all aspects of the standard.
ECMAScript Compatible:
Supports all "types, values, objects, properties, functions, and program syntax and semantics" described by ECMA-262.
Supports Unicode character standards.
Add more "types, values, objects, properties, functions" that are not described in ECMA-262. The new features in West Zhejiang that ECMA-262 talks about mainly refer to this standard. New objects and new properties of objects not specified in .
Supports "Program and Regular Expression Syntax" not defined in ECMA-262. This means that the built-in regular expression syntax can be modified and extended.
ECMAScript (ES) version introduction (version release time)
| Time | Version | Description |
|---|---|---|
| June 1997 | ES1.0 was released | In July of that year, the ECMA262 standard was released |
| In June 1998 | ES2.0 was released | This version modification fully complies with the ISO/IEC 16262 international standard. |
| December 1999 | ES3.0 was released | became the common standard for JavaScript and received widespread support |
| October 2007 | ES4.0 draft was released | Major manufacturers had different opinions and the plan was not passed |
| Released ES3.1 and renamed it ECMAScript 5 | Abolished ECMAScript 4.0, so version 4.0 does not exist | |
| ES 5.0 officially released | ||
| ES5.1 released | This version became the ISO international standard (ISO/IEC 16262:2011) | |
| ES6 draft released | ||
| ES6 was officially released and renamed "ECMAScript 2015" | TC39 The committee decided to release a version of ECMAScript every year | |
| ES7 was released, also known as "ECMAScript 2016" | ||
| ES8 was released, also known as "ECMAScript 2017" | ||
| ES9 was released, also known as "ECMAScript 2018" | ||
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