{"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\/da\/blog\/news\/osnovatel-qemu-i-ffmpeg-opublikoval-javascript-dvizhok-quickjs","title":{"rendered":"Grundl\u00e6ggeren af QEMU og FFmpeg har offentliggjort JavaScript-motoren QuickJS","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Den franske matematiker Fabrice Bellard, der grundlagde projekterne QEMU og FFmpeg, samt skabte den hurtigste formel til beregning af tallet Pi og udviklede billedformatet <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=41198\">BPG<\/a><\/noindex>, har udgivet den f\u00f8rste version af den nye JavaScript-motor <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/\">QuickJS<\/a><\/noindex>. Motoren er kompakt og designet til at blive integreret i andre systemer. Koden til projektet er skrevet i C og distribueres under MIT-licensen. Der er ogs\u00e5 en version af motoren, der er kompileret til WebAssembly ved hj\u00e6lp af Emscripten og egnet til brug i webbrowsere.<\/p>\n<p>Implementeringen af JavaScript <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/quickjs.html\">even Linus Torvalds himself \u2014 he called the WireGuard code \"a work of art.\"<\/a><\/noindex> specifikationen ES2019, inklusiv moduler, asynkrone generatorer og proxyer. Valgfrit underst\u00f8ttes ikke-standard matematiske <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/jsbignum.html\">udvidelsen<\/a><\/noindex> funktioner til JavaScript, s\u00e5som typerne BigInt og BigFloat, samt <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\">operatoroverbelastning<\/a><\/noindex>. I ydeevne ligger QuickJS betydeligt <noindex><a rel=\"nofollow\" href=\"https:\/\/bellard.org\/quickjs\/bench.html\">overlegen<\/a><\/noindex> for eksisterende alternativer, for eksempel i testen<br \/>\n bench-v8 sl\u00e5r motoren <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/Moddable-OpenSource\/moddable\">XS<\/a><\/noindex> med 35%, <noindex><a rel=\"nofollow\" href=\"https:\/\/duktape.org\/\">DukTape<\/a><\/noindex> mere end dobbelt s\u00e5 hurtig, <noindex><a rel=\"nofollow\" href=\"http:\/\/jerryscript.net\/\">JerryScript<\/a><\/noindex> tre gange hurtigere, og <noindex><a rel=\"nofollow\" href=\"https:\/\/mujs.com\/\">MuJS<\/a><\/noindex> med syv gange.<\/p>\n<p>Udover biblioteket til integration af motoren i applikationer tilbyder projektet ogs\u00e5 fortolkeren qjs, som kan bruges til at k\u00f8re JavaScript-kode fra kommandolinjen. Desuden er kompilatoren qjsc tilg\u00e6ngelig, som kan generere selvst\u00e6ndige eksekverbare filer uden eksterne afh\u00e6ngigheder. <\/p>\n<p>Hovedfunktioner:<\/p>\n<ul>\n<li class=\"l\"> Kompakthed og enkel integration i andre projekter. Koden inkluderer kun et par filer i C, som ikke kr\u00e6ver eksterne afh\u00e6ngigheder for at blive samlet. En simpel kompileret applikation fylder omkring 190 KB;\n<li class=\"l\"> Meget h\u00f8j ydeevne og kort opstartstid. Gennemf\u00f8relse af 56.000 tests for kompatibilitet med ECMAScript tager omkring 100 sekunder, n\u00e5r det udf\u00f8res p\u00e5 et enkelt kerne p\u00e5 en almindelig desktop-PC. Initialisering af runtime tager under 300 mikrosekunder;\n<li class=\"l\"> N\u00e6sten fuld support for specifikationen ES2019 og fuld support for applikationen &#171;B&#187;, som definerer komponenter for kompatibilitet med \u00e6ldre webapplikationer;\n<li class=\"l\"> Fuldst\u00e6ndig gennemgang af alle tests fra ECMAScript Test Suite;\n<li class=\"l\"> Underst\u00f8ttelse af kompilering af JavaScript-kode til eksekverbare filer uden eksterne afh\u00e6ngigheder;\n<li class=\"l\"> En affaldsindsamler baseret p\u00e5 referenceopt\u00e6lling uden cyklisk rydning, hvilket har resulteret i forudsigeligt adf\u00e6rd og reduceret hukommelsesforbrug;\n<li class=\"l\"> Et s\u00e6t udvidelser til matematiske beregninger i JavaScript;\n<li class=\"l\"> En shell til at k\u00f8re kode i kommandolinjemodus, der underst\u00f8tter syntaksfarvning;\n<li class=\"l\"> En kompakt standardbibliotek med bindings til C-biblioteket.\n<\/ul>\n<p>Projektet udvikler ogs\u00e5 tre tilknyttede C-biblioteker, der bruges i QuickJS og er velegnede til selvst\u00e6ndig anvendelse: <\/p>\n<ul>\n<li class=\"l\"> libregexp &#8212; en hurtig implementering af regul\u00e6re udtryk, der er fuldt kompatible med Javascript ES 2019 specifikationen;\n<li class=\"l\"> libunicode &#8212; et kompakt bibliotek til arbejde med Unicode;\n<li class=\"l\"> libbf &#8212; en implementering af operationer med flydende komma med vilk\u00e5rlig pr\u00e6cision og transcendente funktioner med pr\u00e6cis afrunding.\n<\/ul>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Kilde: <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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