{"id":55548,"date":"2020-01-23T00:00:00","date_gmt":"2020-01-22T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/novaya-versiya-vstraivaemogo-javascript-dvizhka-ot-osnovatelya-qemu-i-ffmpeg"},"modified":"2020-02-18T14:03:40","modified_gmt":"2020-02-18T11:03:40","slug":"novaya-versiya-vstraivaemogo-javascript-dvizhka-ot-osnovatelya-qemu-i-ffmpeg","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/novaya-versiya-vstraivaemogo-javascript-dvizhka-ot-osnovatelya-qemu-i-ffmpeg","title":{"rendered":"Ny version af den indlejrede JavaScript-motor fra skaberen af QEMU og FFmpeg","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Den franske matematiker Fabrice Bellard, der engang grundlagde projekterne QEMU og FFmpeg, har offentliggjort en opdatering af sin kompakte indlejrede JavaScript-motor. QuickJS<\/a><\/noindex>. Motoren underst\u00f8tter ES2019-specifikationen og yderligere matematiske udvidelser som typerne BigInt og BigFloat. QuickJS er m\u00e6rkbart overlegen<\/a><\/noindex> i forhold til eksisterende alternativer (XS<\/a><\/noindex> med 35%, DukTape<\/a><\/noindex> mere end dobbelt s\u00e5 hurtig, JerryScript<\/a><\/noindex> tre gange hurtigere, og MuJS<\/a><\/noindex> syv gange hurtigere). Projektet tilbyder et bibliotek til indlejring af motoren, en qjs-interpretator til at k\u00f8re JavaScript-kode fra kommandolinjen og en qjsc-kompilator til at generere selvst\u00e6ndige eksekverbare filer. Koden er skrevet i C og distribueres<\/a><\/noindex> under MIT-licensen. Du kan l\u00e6se mere om projektet i teksten til annonceringen af den f\u00f8rste udgivelse.<\/a><\/noindex>.<\/p>\n

Den nye version har tilf\u00f8jet eksperimentel st\u00f8tte til typen BigDecimal<\/a><\/noindex>, som g\u00f8r det muligt at manipulere decimaltal med vilk\u00e5rlig pr\u00e6cision (analogt med BigInt for tal med basis 10). Implementeringen af operatoroverbelastning er blevet opdateret. Der er tilf\u00f8jet eksempler<\/a><\/noindex> programmer til effektiv beregning af tallet \u03c0 med pr\u00e6cision op til en milliard decimaler efter kommaet (som matematiker er Fabrice Bellard kendt for at v\u00e6re skaberen af den hurtigste formel til beregning af tallet \u03c0).<\/p>\n

<\/a><\/noindex><\/p>\n

Kilde: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\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\u0451 \u0432\u0440\u0435\u043c\u044f \u043f\u0440\u043e\u0435\u043a\u0442\u044b QEMU \u0438 FFmpeg, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0435 \u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0435\u043c\u043e\u0433\u043e \u0438\u043c \u043a\u043e\u043c\u043f\u0430\u043a\u0442\u043d\u043e\u0433\u043e \u0432\u0441\u0442\u0440\u0430\u0438\u0432\u0430\u0435\u043c\u043e\u0433\u043e JavaScript-\u0434\u0432\u0438\u0436\u043a\u0430 QuickJS. \u0414\u0432\u0438\u0436\u043e\u043a \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u0442 \u0441\u043f\u0435\u0446\u0438\u0444\u0438\u043a\u0430\u0446\u0438\u044e ES2019 \u0438 \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043c\u0430\u0442\u0435\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0435 \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u044f, \u0442\u0430\u043a\u0438\u0435 \u043a\u0430\u043a \u0442\u0438\u043f\u044b BigInt \u0438 BigFloat. \u041f\u043e \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 QuickJS \u0437\u0430\u043c\u0435\u0442\u043d\u043e \u043f\u0440\u0435\u0432\u043e\u0441\u0445\u043e\u0434\u0438\u0442 \u0438\u043c\u0435\u044e\u0449\u0438\u0435\u0441\u044f \u0430\u043d\u0430\u043b\u043e\u0433\u0438 (XS \u043d\u0430 35%, DukTape \u0431\u043e\u043b\u0435\u0435 \u0447\u0435\u043c \u0432 \u0434\u0432\u0430 \u0440\u0430\u0437\u0430, JerryScript \u0432 \u0442\u0440\u0438 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