ES 3、ES 5、ES 6 分别是什么

上图按照时间顺序说明了 JavaScript、JScript 和 ECMAScript 的发展。

先是在网景工作的 Brendan Eich 临危受命,用十天时间设计出 LiveScript 的第一个版本。临发布前为了讨好 Sun 公司和 Java 程序员,LiveScript 改名为 JavaScript。

微软这边不甘示弱,你的浏览器有脚本功能,我的浏览器也要有啊。于是在 IE 3.0 版本附带推出 JScript。为什么叫 JScript?因为 JavaScript 已被网景公司注册,微软作为一个商业公司必须用一个新的名字。

这下可苦了网页开发者了,虽然两个浏览器都支持脚本,但是两种脚本语法和功能都有区别,一个网页难道要写两套脚本?

一直致力于指定消费电子标准的 ECMA 组织,审时度势,觉得有必要把网页脚本的语法和功能统一一下,于是发布 ECMAScript 标准(第一版)。之后对该标准进行了一些修改,更新到 ECMAScript 3(一下简称 ES 3)。

所以说 ECMAScript 是这种网页脚本的标准,而 JavaScript 和 JScript 则是 ECMAScript 的两种实现。

此后的浏览器厂商都尽量依据 ES 3 来实现自己脚本语言。

如 IE 8 中的 JScript 5.8、Firefox 中的 JavaScript 1.5,都是兼容 ES 3 标准的。

从上图你会发现,之后的 9 年(2000~2009),ES 没有任何升级。期间的 ES 4 居然被放弃了。具体原因可以看这篇知乎问答:ECMAScript 6 会重蹈 ECMAScript 4 的覆辙吗? – 尤雨溪的回答。

直到 2009 年,ES 5 横空出世,同年,前端界也出了一个大事件——Node.js 发布。Node.js 是一个基于 Google Chrome 的 V8 引擎(2008年发布)的 JS 运行环境。

从这一年开始,前端火了。

因为 JS 跳出了浏览器,可以在任何地方运行了。前端工程师被浏览器禁锢的创造力,如雨后春笋般爆发。

JS 维持了几年的高速增长后,大家发现 JS 语言本身,已经不适应它的发展速度了,于是 ES 的更新越来越快了,2015 年发布 ES 6,2016 年的 ES 7 直接更名为 ES 2016,对,你猜对了,以后 ES 说不定会每年更新一次了……

ES 每个版本都更新了什么呢?(大家关心的一般是 ES 5 和 ES 6 的新特性,因为 ES 3 是 IE 8 支持的版本,可以算是基本版本了)

具体可参考如下网站:

ECMAScript 5 compatibility table

ECMAScript 6 compatibility table

ECMAScript Next compatibility table

ECMAScript5和ECMAScript6的新特性及浏览器支持情况

以上,就是 ECMAScript / JavaScript 的简述。

作者:方应杭

57 thoughts on “ES 3、ES 5、ES 6 分别是什么”

  1. Thanks for any other informative web site. Where else may I get that kind of information written in such a perfect way? I have a mission that I’m just now working on, and I’ve been on the glance out for such information.|

  2. After checking out a number of the blog articles on your blog, I really appreciate your technique of blogging. I saved as a favorite it to my bookmark website list and will be checking back soon. Please visit my website as well and let me know your opinion.|

  3. Thank you for some other informative website. Where else may I am getting that kind of info written in such a perfect way? I’ve a venture that I’m just now working on, and I have been at the glance out for such information.|

  4. Great blog right here! Also your website rather a lot up fast! What host are you the usage of? Can I am getting your affiliate link in your host? I desire my web site loaded up as fast as yours lol|

  5. Have you ever thought about creating an e-book or guest authoring on other websites? I have a blog based on the same topics you discuss and would really like to have you share some stories/information. I know my viewers would appreciate your work. If you are even remotely interested, feel free to send me an email.|

  6. Useful information. Lucky me I discovered your web site unintentionally, and I am shocked why this twist of fate did not happened earlier! I bookmarked it.|

  7. Hello there I am so happy I found your blog, I really found you by accident, while I was browsing on Aol for something else, Anyways I am here now and would just like to say cheers for a incredible post and a all round interesting blog (I also love the theme/design), I don’t have time to read it all at the moment but I have saved it and also added your RSS feeds, so when I have time I will be back to read a lot more, Please do keep up the superb work.|

  8. Having read this I believed it was extremely informative. I appreciate you spending some time and effort to put this informative article together. I once again find myself spending a lot of time both reading and commenting. But so what, it was still worthwhile!|

  9. My partner and I stumbled over here different web address and thought I should check things out. I like what I see so i am just following you. Look forward to looking over your web page repeatedly.|

  10. Heya! I’m at work browsing your blog from my new iphone! Just wanted to
    say I love reading your blog and look forward to all your posts!

    Keep up the superb work!

  11. My brother suggested I might like this web site.

    He was entirely right. This post actually made my day.
    You can not imagine just how much time I had spent for this info!
    Thanks!

  12. Hey there! This is my first visit to your blog! We are a team of volunteers and starting a new project
    in a community in the same niche. Your blog provided us beneficial information to work on. You have
    done a outstanding job!

  13. Hurrah! Finally I got a blog from where I be capable of
    truly obtain helpful facts concerning my study
    and knowledge.

  14. After looking over a handful of the blog posts on your blog, I really like
    your way of writing a blog. I added it to my bookmark webpage list and
    will be checking back in the near future. Please check
    out my web site too and let me know what you think.

  15. I have read so many posts regarding the blogger lovers but this
    paragraph is really a fastidious piece of writing, keep it up.

  16. I was very pleased to discover this site.
    I want to to thank you for ones time just for this wonderful read!!
    I definitely loved every little bit of it and I have you bookmarked to see new information on your web site.

  17. Good day! I could have sworn I’ve been to this site before but after browsing through some of the articles I realized it’s new to me. Regardless, I’m definitely happy I found it and I’ll be bookmarking it and checking back often!|

  18. I blog frequently and I truly thank you for your information. This great article has truly peaked my interest. I will bookmark your site and keep checking for new details about once a week. I opted in for your Feed too.|

  19. After going over a handful of the articles on your web page,
    I honestly appreciate your technique of writing a blog.

    I saved as a favorite it to my bookmark website list and will be checking
    back soon. Take a look at my website as well and let me
    know what you think.

  20. I do agree with all of the ideas you have introduced on your post.
    They’re really convincing and can certainly work. Still, the posts are too brief for starters.
    Could you please lengthen them a little from next time?
    Thanks for the post.

  21. It’s the best time to make some plans for the future and it is time to
    be happy. I have read this post and if I could I desire to suggest you few interesting things or suggestions.
    Perhaps you can write next articles referring to this article.

    I desire to read even more things about it!

  22. Great blog here! Also your site loads up very fast!

    What web host are you using? Can I get your affiliate link to
    your host? I wish my web site loaded up as fast as yours
    lol

  23. Today, I went to the beach front with my kids.
    I found a sea shell and gave it to my 4 year old daughter
    and said “You can hear the ocean if you put this to your ear.” She placed the shell to her ear and screamed.
    There was a hermit crab inside and it pinched her ear.
    She never wants to go back! LoL I know this is entirely off
    topic but I had to tell someone!

  24. Thanks for the marvelous posting! I certainly enjoyed reading it,
    you happen to be a great author.I will remember to bookmark your
    blog and will eventually come back sometime soon. I want to encourage
    yourself to continue your great writing, have a
    nice evening!

  25. Having read this I thought it was really enlightening.
    I appreciate you spending some time and energy to put this informative article together.
    I once again find myself spending way too much time both
    reading and posting comments. But so what, it was still
    worthwhile!

发表评论

电子邮件地址不会被公开。