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
這裏有一個詳細的列表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: