1、 JS introduction

js What is it? ？

First ,JavaScript Is a programming language , and C、java、python equally , But and html、css Dissimilarity , They are not programming languages .
secondly ,JavaScript and Java It's nothing to do with half a cent , Just to rub the heat , Originally called liveScript, Later issued Java Of SUN The company decides and develops javaScript Netscape (netscape) The company cooperates in this project , Renamed as JavaScript.

ES

ECMAScript, abbreviation ES,ECMA It is the European computer manufacturing Federation , It's an organization , Used to define standards , The standard that this organization has come up with is ECMAScript.JS Just follow ES This standard , Study JS First, learn ES standard , Which defines js Basic language specifications .
classical edition ：ES3、ES5、ES6+
What we are learning now JS, Most of them belong to ES3 and ES5 The content in .