{"id":101400,"date":"2021-09-25T10:22:59","date_gmt":"2021-09-25T08:22:59","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/proekt-elk-razvivaet-kompaktnyj-javascript-dvizhok-dlya-mikrokontrollerov"},"modified":"2021-09-25T10:22:59","modified_gmt":"2021-09-25T08:22:59","slug":"proekt-elk-razvivaet-kompaktnyj-javascript-dvizhok-dlya-mikrokontrollerov","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/proekt-elk-razvivaet-kompaktnyj-javascript-dvizhok-dlya-mikrokontrollerov","title":{"rendered":"Projektet elk udvikler en kompakt JavaScript-motor til mikrocontrollere.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Den nye version af JavaScript-motoren elk 2.0.9 er tilg\u00e6ngelig og er designet til brug i systemer med begr\u00e6nsede ressourcer, s\u00e5som mikrokontrollere, inklusive ESP32- og Arduino Nano-kort med 2 KB RAM og 30 KB Flash. For at k\u00f8re den leverede virtuelle maskine kr\u00e6ves der kun 100 byte hukommelse og 20 KB lagerplads. Projektkoden er skrevet i C og distribueres under GPLv2-licensen. For at bygge projektet er en C-kompilator tilstr\u00e6kkelig \u2014 der anvendes ingen yderligere afh\u00e6ngigheder. Projektet udvikles af udviklerne bag Mongoose OS-operativsystemet for IoT-enheder, JavaScript-motoren mJS og indlejret. webserveren<\/a> Mongoose (bruges i produkter fra virksomheder som Siemens, Schneider Electric, Broadcom, Bosch, Google, Samsung og Qualcomm). <\/p>\n

Hovedform\u00e5let med Elk er at skabe firmware til mikrokontrollere i JavaScript, der udf\u00f8rer forskellige automatiseringsopgaver. Motoren er ogs\u00e5 velegnet til indlejring af JavaScript-behandlere i C\/C++-applikationer. For at bruge motoren i din kode er det tilstr\u00e6kkeligt at placere elk.c-filen i kildekodetr\u00e6et, inkludere elm.h headerfilen og bruge js_eval-funktionen. Det er tilladt at kalde fra JavaScript-scripts funktioner, der er defineret i C\/C++-koden, og omvendt. JavaScript-koden k\u00f8rer i et beskyttet og isoleret milj\u00f8 fra hovedkoden ved hj\u00e6lp af en fortolker, der ikke genererer bytecode og ikke bruger dynamisk hukommelsestildeling. <\/p>\n

I Elk er der implementeret et lille, men tilstr\u00e6kkeligt subset af Ecmascript 6-specifikationen til at skabe arbejdsfilscenarier. Specifikt underst\u00f8ttes et grundl\u00e6ggende s\u00e6t af operatorer og datatyper, men der er ingen underst\u00f8ttelse af arrays, prototyper, this-udtryk, new og delete. I stedet for var og const anbefales det at bruge let, og for do, switch og for \u2014 while. Der leveres ikke en standardbibliotek, dvs. der er ingen s\u00e5danne objekter som Date, Regexp, Function, String og Number.
\n
Kilde: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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