{"id":36081,"date":"2019-10-31T22:09:30","date_gmt":"2019-10-31T19:09:30","guid":{"rendered":"https:\/\/prohoster.info\/blog\/osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-quickjs\/"},"modified":"2019-10-31T22:09:30","modified_gmt":"2019-10-31T19:09:30","slug":"osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-quickjs","status":"publish","type":"post","link":"https:\/\/prohoster.info\/nl\/blog\/news\/osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-quickjs","title":{"rendered":"De oprichter van QEMU en FFmpeg heeft de JavaScript-engine QuickJS gepubliceerd","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>De Franse wiskundige Fabrice Bellard, die ooit de projecten QEMU en FFmpeg oprichtte, evenals de snelste formule voor het berekenen van Pi ontwikkelde en het afbeeldingsformaat BPG, <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=41198\">BPG<\/a><\/noindex>, heeft de eerste versie van de nieuwe JavaScript-engine <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/\">QuickJS<\/a><\/noindex>gepubliceerd. De engine is compact en gericht op integratie in andere systemen. De projectcode is geschreven in C en wordt verspreid onder de MIT-licentie. Ook is er een versie van de engine beschikbaar die in WebAssembly is gecompileerd met behulp van Emscripten en geschikt is voor gebruik in webbrowsers.<\/p>\n<p>De implementatie van JavaScript <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/quickjs.html\">wordt ondersteund<\/a><\/noindex> volgt de specificatie ES2019, inclusief modules, asynchrone generatoren en proxies. Optioneel worden niet-standaard wiskundige <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/jsbignum.html\">de extensie<\/a><\/noindex> types voor JavaScript ondersteund, zoals BigInt en BigFloat, evenals <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9F%D0%B5%D1%80%D0%B5%D0%B3%D1%80%D1%83%D0%B7%D0%BA%D0%B0_%D0%BE%D0%BF%D0%B5%D1%80%D0%B0%D1%82%D0%BE%D1%80%D0%BE%D0%B2\">operatoroverloading<\/a><\/noindex>. Wat prestaties betreft overtreft QuickJS aanzienlijk <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/bench.html\">de bestaande analogen, bijvoorbeeld in de test<\/a><\/noindex> bench-v8 overtreft het motortje<br \/>\n XS <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/Moddable-OpenSource\/moddable\">met 35%,<\/a><\/noindex> DukTape <noindex><a rel=\"nofollow\" href=\"https:\/\/duktape.org\/\">meer dan twee keer,<\/a><\/noindex> JerryScript <noindex><a rel=\"nofollow\" href=\"http:\/\/jerryscript.net\/\">drie keer, en<\/a><\/noindex> MuJS <noindex><a rel=\"nofollow\" href=\"https:\/\/mujs.com\/\">zeven keer.<\/a><\/noindex> Naast de bibliotheek voor integratie van de motor in applicaties biedt het project ook de interpreter qjs aan, die kan worden gebruikt om JavaScript-code vanuit de opdrachtregel uit te voeren. Bovendien is er een compiler qjsc beschikbaar die uitvoerbare bestanden kan genereren die geschikt zijn voor onafhankelijke uitvoering zonder externe afhankelijkheden.<\/p>\n<p>Compactheid en eenvoud van integratie in andere projecten. De code omvat slechts een paar C-bestanden, die geen externe afhankelijkheden vereisen voor compilatie. Een eenvoudig gecompileerde applicatie neemt ongeveer 190 kB in beslag; <\/p>\n<p>Belangrijkste kenmerken:<\/p>\n<ul>\n<li class=\"l\"> Zeer hoge prestaties en een korte opstarttijd. Het doorlopen van 56.000 tests voor compatibiliteit met ECMAScript duurt ongeveer 100 seconden wanneer uitgevoerd op \u00e9\u00e9n core van een gewone desktop-pc. De initialisatie van de runtime kost minder dan 300 microseconden;\n<li class=\"l\"> Bijna volledige ondersteuning van de ES2019-specificatie en volledige ondersteuning van de applicatie 'B', die componenten definieert voor compatibiliteit met oudere webapplicaties;\n<li class=\"l\"> Bijna volledige ondersteuning van de ES2019-specificatie en volledige ondersteuning van de applicatie &#171;B&#187;, die componenten definieert voor compatibiliteit met oudere webapplicaties;\n<li class=\"l\"> Ondersteuning voor het compileren van JavaScript-code naar uitvoerbare bestanden zonder externe afhankelijkheden;\n<li class=\"l\"> Een garbage collector op basis van referentietelling zonder cyclische opruimoperaties, wat heeft geleid tot voorspelbaar gedrag en een verminderd geheugengebruik;\n<li class=\"l\"> Een garbage collector op basis van referentietelling zonder cyclische opruiming, wat voorspelbaar gedrag en een lager geheugenverbruik mogelijk maakt.\n<li class=\"l\"> Een set extensies voor wiskundige berekeningen in de programmeertaal JavaScript;\n<li class=\"l\"> Een shell voor het uitvoeren van code in de opdrachtregelmodus, met ondersteuning voor syntaxhighlighting;\n<li class=\"l\"> Een compacte standaardbibliotheek met wrappers bovenop de C-bibliotheek.\n<\/ul>\n<p>Het project ontwikkelt ook drie bijbehorende C-bibliotheken, gebruikt in QuickJS en geschikt voor afzonderlijk gebruik: <\/p>\n<ul>\n<li class=\"l\"> libregexp \u2014 snelle implementatie van reguliere expressies, volledig compatibel met de Javascript ES 2019-specificatie;\n<li class=\"l\"> libunicode \u2014 compacte bibliotheek voor werken met Unicode;\n<li class=\"l\"> libbf \u2014 implementatie van bewerkingen met drijvende komma van willekeurige precisie en transcendente functies met nauwkeurige afronding.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Bron: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51079\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0424\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u0438\u0439 \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a \u0424\u0430\u0431\u0440\u0438\u0441 \u0411\u0435\u043b\u043b\u0430\u0440 (Fabrice Bellard), \u043e\u0441\u043d\u043e\u0432\u0430\u0432\u0448\u0438\u0439 \u0432 \u0441\u0432\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u043f\u0440\u043e\u0435\u043a\u0442\u044b QEMU \u0438 FFmpeg, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0441\u043e\u0437\u0434\u0430\u0432\u0448\u0438\u0439 \u0441\u0430\u043c\u0443\u044e \u0431\u044b\u0441\u0442\u0440\u0443\u044e \u0444\u043e\u0440\u043c\u0443\u043b\u0443 \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u044f \u0447\u0438\u0441\u043b\u0430 \u041f\u0438 \u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u0432\u0448\u0438\u0439 \u0444\u043e\u0440\u043c\u0430\u0442 \u0438\u0437\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u0439 BPG, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043f\u0435\u0440\u0432\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043d\u043e\u0432\u043e\u0433\u043e JavaScript-\u0434\u0432\u0438\u0436\u043a\u0430 QuickJS. \u0414\u0432\u0438\u0436\u043e\u043a \u043e\u0442\u043b\u0438\u0447\u0430\u0435\u0442\u0441\u044f \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u043e\u0441\u0442\u044c\u044e \u0438 \u043e\u0440\u0438\u0435\u043d\u0442\u0438\u0440\u043e\u0432\u0430\u043d \u043d\u0430 \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u043d\u0438\u0435 \u0432 \u0434\u0440\u0443\u0433\u0438\u0435 \u0441\u0438\u0441\u0442\u0435\u043c\u044b. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 \u044f\u0437\u044b\u043a\u0435 \u0421\u0438 \u0438 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 MIT. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-36081","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0424\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u0438\u0439 \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a \u0424\u0430\u0431\u0440\u0438\u0441 \u0411\u0435\u043b\u043b\u0430\u0440 (Fabrice Bellard), \u043e\u0441\u043d\u043e\u0432\u0430\u0432\u0448\u0438\u0439 \u0432 \u0441\u0432\u043e\u0435 \u0432\u0440\u0435\u043c\u044f \u043f\u0440\u043e\u0435\u043a\u0442\u044b QEMU \u0438 FFmpeg, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0441\u043e\u0437\u0434\u0430\u0432\u0448\u0438\u0439 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BPG,","canonical_url":"https:\/\/prohoster.info\/nl\/blog\/news\/osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-quickjs","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"nl_NL","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u041e\u0441\u043d\u043e\u0432\u0430\u0442\u0435\u043b\u044c QEMU \u0438 FFmpeg \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b JavaScript-\u0434\u0432\u0438\u0436\u043e\u043a QuickJS | ProHoster","og:description":"\u0424\u0440\u0430\u043d\u0446\u0443\u0437\u0441\u043a\u0438\u0439 \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u043a 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