JavaScript Versions

JavaScript Versions

JavaScript was invented by Brendan Eich in 1995, and became an ECMA standard in 1997.

ECMAScript is the official name of the language.

ECMAScript versions have been abbreviated to ES1, ES2, ES3, ES5, and ES6.

From 2015 ECMAScript is named by year (ECMAScript 2015).

ECMAScript Editions

这里有一个详细的列表

Browser Support

ECMAScript 3 is fully supported in all browsers.

ECMAScript 5 is fully supported in all modern browsers.

Browser Support for ES5 (2009)

Browser	Version	From Date
Chrome	23	Sep 2012
Firefox	21	Apr 2013
IE	9*	Mar 2011
IE / Edge	10	Sep 2012
Safari	6	Jul 2012
Opera	15	Jul 2013

* Internet Explorer 9 does not support ECMAScript 5 "use strict".

Browser Support for ES6 (ECMAScript 2015)

Browser	Version	Date
Chrome	51	May 2016
Firefox	54	Jun 2017
Edge	14	Aug 2016
Safari	10	Sep 2016
Opera	38	Jun 2016

Internet Explorer does not support ECMAScript 2015.

 

JavaScript / ECMAScript

JavaScript was developed for Netscape. Netscape 2 was the first browser to run JavaScript.

After Netscape the Mozilla foundation continued to develop JavaScript for the Firefox browser.

The latest JavaScript version was 1.8.5. (Identical to ECMAScript 5).

ECMAScript was developed by ECMA International after the organization adopted JavaScript.

The first edition of ECMAScript was released in 1997.

This list compares the version numbers of the different products:

Year	JavaScript	ECMA	Browser
1996	1.0		Netscape 2
1997		ECMAScript 1	IE 4
1998	1.3		Netscape 4
1999		ECMAScript 2	IE 5
2000		ECMAScript 3	IE 5.5
2000	1.5		Netscape 6
2000	1.5		Firefox 1
2011		ECMAScript 5	IE 9 (Except "use strict")
2011	1.8.5		Firefox 4 (Except leading zeroes in parseInt)
2012			IE 10
2012			Chrome 23
2012			Safari 6
2013			Firefox 21
2013			Opera 15
2015		ECMAScript 2015	Partially Supported in all Browser

IE 4 was the first browser to support ECMAScript 1 (1997).

IE 5 was the first browser to support ECMAScript 2 (1999).

IE 5.5 was the first browser to support ECMAScript 3 (2000).

IE 9* was the first browser to support ECMAScript 5 (2011).

Internet Explorer 9 does not support ECMAScript 5 "use strict".

Chrome 23, IE 10, and Safari 6 were the first browsers to fully support ECMAScript 5:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

作者:Chuck Lu    GitHub