blocks|key|4304392|text|来自ECMA-262+spec，§7.6.1.2+(未来保留字)：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4304393|​|4304394|📷|atomic|4304395|4304396|并且，来自§2+(一致性)：|4304397|4304398|允许ECMAScript的一致性实现支持本规范中未描述的程序和正则表达式语法。具体地说，ECMAScript的一致性实现被允许支持使用本规范7.6.1.2中列出的“未来保留字”的程序语法。|blockquote|4304399|4304400|entityMap|0|LINK|mutability|MUTABLE|url|http://www.ecma-international.org/publications/standards/Ecma-262.htm|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/c9cc1dd57750d7d10916528e3b3391aa.png|imageAlt^0|2|D|0|0|0|0|1|1|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|14|8|@]|9|@$A|15|B|16|1|17]]|C|$]]|$1|D|3|E|5|6|7|18|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|19|8|@]|9|@$A|1A|B|1B|1|1C]]|C|$]]|$1|I|3|E|5|6|7|1D|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|1E|8|@]|9|@]|C|$]]|$1|L|3|-4|5|6|7|1F|8|@]|9|@]|C|$]]|$1|M|3|N|5|O|7|1G|8|@]|9|@]|C|$]]|$1|P|3|-4|5|6|7|1H|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|1I|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]|Y|$5|Z|U|10|C|$11|12|13|-4]]]]

From the <a href="http://www.ecma-international.org/publications/standards/Ecma-262.htm" rel="nofollow noreferrer">ECMA-262 spec</a>, &sect;7.6.1.2 (Future Reserved Words):

<img src="https://i.stack.imgur.com/0gRWM.png" alt="ecmascipt section screenshot">

And, from &sect;2 (Conformance):

<blockquote>
 A conforming implementation of ECMAScript is permitted to support program and regular expression syntax not described in this specification. In particular, a conforming implementation of ECMAScript is permitted to support program syntax that makes use of the "future reserved words" listed in 7.6.1.2 of this specification. 
</blockquote>

blocks|key|608807|text|保留这些单词只是为了给原始作者(Brendan+Eich)提供一个构建关键字的起点。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|608808|此外，JavaScript在设计时考虑到了|608809|的语法和标准库。特别是，所有的关键字都保留在原始的JavaScript中，JavaScript的标准库遵循Java的命名约定，并且JavaScript的Math和Date对象是based+on+classes+from+Java+1.0。|blockquote|608810|608811|JS必须“看起来像爪哇”，但不是这样，成为爪哇的哑巴弟弟或男孩人质伙伴。另外，我必须在十天内完成，否则会发生比JS更糟糕的事情“--+Brendan+Eich|608812|608813|目前还没有计划将特定的Java功能集成到Javascript中。current+roadmap建议使用以下功能：|608814|608815|Classes|unordered-list-item|608816|A模块system|608817|Optional类型批注和静态类型，可能使用结构类型system|608818|Generators和iterators|608819|Destructuring+assignment|608820|Algebraic数据类型|608821|608822|entityMap|0|LINK|mutability|MUTABLE|url|http://brendaneich.com/|1|http://weblogs.mozillazine.org/roadmap/archives/2008/04/popularity.html|2|http://simonwillison.net/2010/Oct/16/jwz/|3|http://en.wikipedia.org/wiki/ECMAScript#Future_development^0|G|C|0|0|0|2G|U|1|0|0|1V|C|2|0|0|W|F|3|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1H|8|@]|9|@$A|1I|B|1J|1|1K]]|C|$]]|$1|D|3|E|5|6|7|1L|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|1M|8|@]|9|@$A|1N|B|1O|1|1P]]|C|$]]|$1|I|3|-4|5|6|7|1Q|8|@]|9|@]|C|$]]|$1|J|3|K|5|6|7|1R|8|@]|9|@$A|1S|B|1T|1|1U]]|C|$]]|$1|L|3|-4|5|6|7|1V|8|@]|9|@]|C|$]]|$1|M|3|N|5|6|7|1W|8|@]|9|@$A|1X|B|1Y|1|1Z]]|C|$]]|$1|O|3|-4|5|6|7|20|8|@]|9|@]|C|$]]|$1|P|3|Q|5|R|7|21|8|@]|9|@]|C|$]]|$1|S|3|T|5|R|7|22|8|@]|9|@]|C|$]]|$1|U|3|V|5|R|7|23|8|@]|9|@]|C|$]]|$1|W|3|X|5|R|7|24|8|@]|9|@]|C|$]]|$1|Y|3|Z|5|R|7|25|8|@]|9|@]|C|$]]|$1|10|3|11|5|R|7|26|8|@]|9|@]|C|$]]|$1|12|3|-4|5|6|7|27|8|@]|9|@]|C|$]]|$1|13|3|-4|5|6|7|28|8|@]|9|@]|C|$]]]|14|$15|$5|16|17|18|C|$19|1A]]|1B|$5|16|17|18|C|$19|1C]]|1D|$5|16|17|18|C|$19|1E]]|1F|$5|16|17|18|C|$19|1G]]]]

The words are reserved only to offer the original author (<a href="http://brendaneich.com/" rel="nofollow noreferrer">Brendan Eich</a>) a starting point on which to build keywords.
<blockquote>
In addition, JavaScript was designed
with Java's syntax and standard
library in mind. In particular, all
Java keywords were reserved in
original JavaScript, JavaScript's
standard library follows Java's naming
conventions, and JavaScript's Math and
Date objects are <a href="http://weblogs.mozillazine.org/roadmap/archives/2008/04/popularity.html" rel="nofollow noreferrer">based on classes from
Java 1.0</a>.
&quot;JS had to “look like Java” only less so, be Java’s dumb kid brother or boy-hostage sidekick. Plus, I had to be done in ten days or something worse than JS would have happened&quot; — <a href="http://simonwillison.net/2010/Oct/16/jwz/" rel="nofollow noreferrer">Brendan Eich</a>
</blockquote>
There are currently no plans to integrate specific Java features into Javascript. The <a href="http://en.wikipedia.org/wiki/ECMAScript#Future_development" rel="nofollow noreferrer">current roadmap</a> suggests these features:
<ul>
<li>Classes</li>
<li>A module system</li>
<li>Optional type annotations and static typing, probably using a structural type system</li>
<li>Generators and iterators</li>
<li>Destructuring assignment</li>
<li>Algebraic data types</li>
</ul>

blocks|key|4304193|text|不，它们不能保证任何东西，它们最初是保留的“以防万一”，并从那时起就一直坚持使用这种语言。它们可能会使用，也可能不会使用，但大多数在不久的将来都不会使用。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4304194|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

No they don't guarantee anything, they were originally reserved "just in case" and have stuck in the language since then. They may or may not get used but most will not be used in the near future.

blocks|key|4304338|text|@Andy和@OriginalSyn已经回答了你的问题，我只想回答这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4304339|4304340|我很想把接口、抽象类之类的东西引入到js中，但是保留这些词意味着什么吗？|blockquote|4304341|4304342|4304343|这些结构不太可能出现在JavaScript中。JS遵循prototype-based+OOP模型，该模型不使用类之类的东西。与经典的基于类的模型相比，这种模型有一些优势，您将不得不喜欢它，或者停止使用JS，因为这种语言没有真正的替代品。;)|offset|length|4304344|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Prototype_based^0|0|0|0|0|0|R|F|0|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|U|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|V|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|W|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|X|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|Y|8|@]|9|@$J|Z|K|10|1|11]]|A|$]]|$1|L|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S]]]]

@Andy and @OriginalSyn already answered your question and I just wanted to answer to this:

<blockquote>
 I would love to se interfaces, abstract classes and things like that coming to js, but does the reservation of these words indicate anything?
</blockquote>

It's very unlikely that these constructions have ever appear in JavaScript. JS follows <a href="http://en.wikipedia.org/wiki/Prototype_based" rel="nofollow">prototype-based</a> OOP model which doesn't use things like classes. This model has some advantages over classical, class-based model and you'll have to love it or stop using JS as there is no real alternative for this language. ;)

according to this page
<a href="http://www.quackit.com/javascript/javascript_reserved_words.cfm" rel="nofollow">http://www.quackit.com/javascript/javascript_reserved_words.cfm</a>
javascript has some keywords which are from java, reserved. I also notice that with the highlighting in my editor. Is this to be future proof? Are they planning to implement some more OOP style operators into javascript?

I would love to se interfaces, abstract classes and things like that coming to js, but does the reservation of these words indicate anything?

java keywords in javascript

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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根据这个页面， javascript有一些来自java的关键字，保留。我还注意到编辑器中的高亮显示。这是未来的证据吗？他们是否计划在javascript中实现更多的OOP风格的运算符？我很想把接口、抽象类之类的东西引入到js中，但是保留这些词是否意味着什么呢？

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