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V8 (JavaScript引擎) - 版本历史
2026-07-09T08:07:16Z
在这个wiki上该页的修订历史
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imported>Adachan06：修正失效錨點
2025-10-06T11:23:31Z
<p>修正失效錨點</p>
<p><b>新页面</b></p><div>{{NoteTA<br />
|G1 = IT<br />
|G2 = FL<br />
}}<br />
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{{Infobox Software<br />
| name = Google V8 JavaScript引擎<br />
| logo = V8_JavaScript_engine_logo_2.svg<br />
| logo size = 100px<br />
| logo caption = {{font|size=12px|css=font-weight:normal|''Google V8 JavaScript引擎標誌''}}<br />
| developer = [[Google]]<br />
| operating system = [[Microsoft Windows]]、[[Mac OS X]]、[[Linux]]、[[FreeBSD]]、[[Android]]、[[webOS]]<br />
| released={{start date and age|2008|09|02}}<br />
| latest release version = {{LSR/wikidata}}<br />
| programming language = [[C++]]<br />
| genre = [[JavaScript引擎]]<br />
| license = [[BSD許可證]]<br />
}}<br />
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'''V8'''是一個由[[Google]]開發的[[開源]][[JavaScript引擎]]，用於[[Google Chrome]]及[[Chromium]]中<ref name="comic">{{cite web |author=Philipp Lenssen |date=2008-09-01 |title=Google on Google Chrome - comic book |url=http://blogoscoped.com/google-chrome/ |work=[[Google Blogoscoped]] |accessdate=2008-09-01 |archive-date=2015-06-18 |archive-url=https://web.archive.org/web/20150618214149/http://blogoscoped.com/google-chrome/ |dead-url=no }}</ref>，項目以[[V8发动机]]其命名<ref>{{cite web|url=https://v8.dev/blog/10-years|title=Celebrating 10 years of V8|last=Bynens|first=Mathias|date=September 11, 2018|accessdate=2019-05-21|archive-date=2022-05-06|archive-url=https://web.archive.org/web/20220506082447/https://v8.dev/blog/10-years}}</ref>。此項目由[[Lars Bak]]主導開發<ref>{{cite web|last=Minto|first=Rob|date=27 March 2009|title=The genius behind Google's web browser|url=http://www.ft.com/cms/s/2/03775904-177c-11de-8c9d-0000779fd2ac.html|url-status=live|archive-url=https://web.archive.org/web/20111201001419/http://www.ft.com:80/cms/s/2/03775904-177c-11de-8c9d-0000779fd2ac.html|archive-date=1 December 2011|access-date=1 June 2021|publisher=[[Financial Times]]}}{{subscription required}}</ref>。<br />
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== 運作方式 ==<br />
V8在執行之前將[[JavaScript]][[編譯]]成了[[機器碼]]，而非[[位元組碼]]或是[[解释器|解释执行]]它，以此提升效能。更進一步，使用了如[[內聯緩存]]（inline caching）等方法來提高性能。有了這些功能，[[JavaScript]]程序與V8引擎的速度媲美二進制編譯。<ref name="SearchSOA">{{cite news<br />
|url=http://searchsoa.techtarget.com/news/article/0,289142,sid26_gci1328625,00.html<br />
|title=Google Chrome shifts architects' equations as V8 powers the browser<br />
|publisher=SOA News<br />
|date=5 September 2008<br />
|accessdate=2008-09-07<br />
|first=Rich<br />
|last=Seeley<br />
|author2=Jack Vaughan<br />
|archive-date=2010-04-27<br />
|archive-url=https://web.archive.org/web/20100427070124/http://searchsoa.techtarget.com/news/article/0,289142,sid26_gci1328625,00.html<br />
}}</ref><br />
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传统的Javascript是动态语言，又可稱之為Prototype-based Language，JavaScript繼承方法是使用prototype，透過指定prototype屬性，便可以指定要繼承的目標。属性可以在运行时添加到或从对象中删除，引擎會为執行中的物件建立一個属性字典，新的属性都要透過字典查找属性在内存中的位置。V8為object新增属性的时候，就以上次的hidden class为父类別，创建新属性的hidden class的子类別，如此一來属性访问不再需要动态字典查找了。<br />
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為了缩短由[[垃圾回收 (计算机科学)|垃圾回收]]造成的停顿，V8使用stop-the-world, generational, accurate的垃圾回收器<ref>{{cite web |url=http://code.google.com/intl/sv/apis/v8/intro.html |title=V8 JavaScript Engine: Introduction |work=[[Google Code]] |publisher=[[Google]] |accessdate=17 August 2010 |deadurl=yes |archiveurl=https://web.archive.org/web/20100606062020/http://code.google.com/intl/sv/apis/v8/intro.html |archivedate=2010年6月6日 }}</ref>。在执行回收之时会暫時中断程序的执行，而且只处理物件堆疊。還會收集內存內所有物件的指標，可以避免内存溢位的情况。V8[[汇编语言#工具|組譯器]]是基於[[Strongtalk]]組譯器<ref>{{Cite web |url=http://code.google.com/p/v8/source/browse/trunk/LICENSE |title=v8 Licenses |access-date=2010-03-17 |archive-date=2015-11-27 |archive-url=https://web.archive.org/web/20151127013211/http://code.google.com/p/v8/source/browse/trunk/LICENSE }}</ref>。<br />
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== 参考文献 ==<br />
{{Reflist|30em}}<br />
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== 外部連結 ==<br />
* [http://code.google.com/p/v8/ Google Code project page] {{Wayback|url=http://code.google.com/p/v8/ |date=20151207152859 }}<br />
* [http://code.google.com/p/cproxyv8/ cproxyv8] {{Wayback|url=http://code.google.com/p/cproxyv8/ |date=20151228010533 }}及[http://code.google.com/p/v8-juice/ v8-juice] {{Wayback|url=http://code.google.com/p/v8-juice/ |date=20160404234809 }} are C++ libraries for extending v8, e.g. to assist in binding client-side C++ classes to JavaScript.<br />
* [http://code.google.com/p/v8cgi/ v8cgi] {{Wayback|url=http://code.google.com/p/v8cgi/ |date=20161228145503 }} is a v8-based framework for serving web application written in JavaScript.<br />
* [http://nodejs.org/ node.js]{{Wayback|url=http://nodejs.org/ |date=20200710114002 }}[http://simonwillison.net/2009/Nov/23/node/]{{Wayback|url=http://simonwillison.net/2009/Nov/23/node/ |date=20100323181904 }} is a toolkit for writing performant non-blocking event-driven network servers in JavaScript.<br />
* [http://channel9.msdn.com/shows/Going+Deep/Expert-to-Expert-Erik-Meijer-and-Lars-Bak-Inside-V8-A-Javascript-Virtual-Machine/ Inside V8 - A Javascript Virtual Machine] {{Wayback|url=http://channel9.msdn.com/shows/Going+Deep/Expert-to-Expert-Erik-Meijer-and-Lars-Bak-Inside-V8-A-Javascript-Virtual-Machine/ |date=20211106165123 }}<br />
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== 參見 ==<br />
{{Portal|Google|软件|计算机程序设计}}<br />
* [[Google Chrome]]<br />
* [[Chromium (浏览器)]]<br />
* [[WebKit#JavaScriptCore|JavaScriptCore]]<br />
* [[Dart]]<br />
* [[SpiderMonkey]]<br />
* [[即时编译]]<br />
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{{-}}<br />
{{Google Inc.|corporate=yes|products=yes}}<br />
{{ECMAScript}}<br />
{{Node.js}}<br />
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[[Category:JavaScript引擎]]<br />
[[Category:虛擬機器]]<br />
[[Category:Google軟體]]<br />
[[Category:使用BSD许可证的软件]]<br />
[[Category:自由編譯器與直譯器]]</div>
imported>Adachan06