Introduction to JavaScript

JavaScript Development History

In 1995, the company launched LiveScript by Netscape (Netscape). Prior to this, without the so-called front-end technology, all of the processing needs to be done by the server? Line-in.

LiveScript by Netscape United SUN Co., Ltd. Meanwhile, Netscape has renamed LiveScript to JavaScript.

Microsoft launched the IE3.0 version of JavaScript, JScript.

In 1997, JavaScript 1.1 was defined by the European Association of Computer manufacturers. This is only a language version of the JavaScript language. The new version of the launch, more renamed to ECMAScript. This version is defined by Netscape, SUN, Microsoft and others.

JavaScript components

. ECMAScript ECMAScript is the standard of a scripting language, ECMA-262 standard. This standard is not limited to JavaScript-enabled. Examples, such as ActionScript, are standard in the ECMA-262 language. ECMAScript describes the following: syntax, types, statement sentences, keywords, reserved left words, operators, objects, and so on.

. BOM (Browser object model): Browser? object models

. DOM (Document Object model):

ECMAScript Introduction

ECMAScript? A scripting language that is standardized by the ECMA International (formerly the European Association of Computer manufacturers) through ECMA-262. Is this language spoken in the Web? Widely used, it is often called JavaScript or JScript, but in fact the latter two are implementations and extensions of the ECMA-262 standard.

ECMAScript Development History

1996-11 months? Netscape has submitted JavaScript to the European Association of Computer Manufacturers (ECMA), hoping that the language will become an international standard.

1997 06-month ECMA released the version No. 262 of the standard document (ECMA-262), which specifies the standard of the browser script language, and this language is called the ECMAScript, this version is the 1.0 version. This standard has been developed for JavaScript in the first place, but there are two reasons why it is not called javascript: it is a trademark, Java is the trademark of Sun company, according to the license agreement, only Netscape company can legally make use of javascript The name, and JavaScript itself has been registered as a trademark of the Netscape company.

: Do you want to embody this language? The creator of the word is the ECMA, not the Netscape, which is conducive to the guarantee of the openness of the language and the middle of it? Of

Therefore, the relationship between ECMAScript and JavaScript is that the former is the norm of the latter, the latter being the former? One implementation (and the other ECMAScript, JScript and ActionScript). In everyday situations, these two words can be interchangeable.

Introduction to JavaScript