{"id":8389,"date":"2021-08-23T11:02:48","date_gmt":"2021-08-23T08:02:48","guid":{"rendered":"https:\/\/www.limonhost.net\/makaleler\/?p=8389"},"modified":"2021-12-08T15:57:16","modified_gmt":"2021-12-08T12:57:16","slug":"javascript-nedir-yeni-baslayanlara-javascript-rehberi","status":"publish","type":"post","link":"https:\/\/www.limonhost.net\/makaleler\/genel\/javascript-nedir-yeni-baslayanlara-javascript-rehberi\/","title":{"rendered":"JavaScript Nedir? Yeni Ba\u015flayanlara JavaScript Rehberi"},"content":{"rendered":"<h2>JavaScript Nedir?<\/h2>\n<p>JavaScript, \u00f6zellikle <a href=\"https:\/\/www.limonhost.net\/web-site-mimari\">haz\u0131r web sitelerinde<\/a> kullan\u0131c\u0131lar i\u00e7in etkile\u015fimli ve dinamik bir hale getirmek amac\u0131yla hem sunucu hem de istemci taraf\u0131nda kullan\u0131lan metin tabanl\u0131 bir programlama dilidir. Her g\u00fcn kullan\u0131lan ve hayat\u0131n \u00f6nemli birer par\u00e7as\u0131 hale gelen uygulamalar\u0131n \u00e7o\u011fu JavaScript dilinde kodlanm\u0131\u015ft\u0131r. Web sitelerine HTML ile CSS kullan\u0131larak yap\u0131 ve stil kazand\u0131r\u0131l\u0131rken JavaScript ile kullan\u0131c\u0131larla etkile\u015fim yaratan \u00f6\u011feler olu\u015fturulur. G\u00fcnl\u00fck olarak kulland\u0131\u011f\u0131m\u0131z Youtube, Twitter veya Facebook gibi sayfalar\u0131n ana ekranlar\u0131n\u0131n yenilenme \u00f6zelli\u011fi, haber sitelerinin i\u00e7erisindeki videolar gibi bir\u00e7ok web sitesi \u00f6\u011fesi JavaScript dili olu\u015fturulmu\u015ftur.<\/p>\n<p>K\u0131saltmas\u0131 .js olan JavaScript\u2019in ne oldu\u011funu daha iyi kavramak amac\u0131yla, standart web teknolojilerini HTML, CSS ve JavaScript olarak 3 katmana ay\u0131rarak incelemek mant\u0131kl\u0131 olacakt\u0131r.<\/p>\n<ol>\n<li>HTML, bir web sitesindeki ba\u015fl\u0131klar\u0131 yerle\u015ftirmek, veri tablolar\u0131n\u0131 tan\u0131mlamak ya da sayafaya g\u00f6rsel veya video g\u00f6mmek i\u00e7in kullan\u0131lan; k\u0131sacas\u0131 web i\u00e7eri\u011fini yap\u0131land\u0131rmada ve \u015fekillendirmede \u00f6nemli bir yere sahip bi\u00e7imlendirme dilidir.<\/li>\n<li>CSS, HTML ile olu\u015fturulmu\u015f i\u00e7eri\u011fe g\u00f6r\u00fcn\u00fcm (renk, stil, vb.) kazand\u0131rmak i\u00e7in kullan\u0131lan stil kurallar\u0131 dilidir.<\/li>\n<li>JavaScript ise g\u00fcncellenen i\u00e7erikler olu\u015fturmak, multimedya kontrollerini ger\u00e7ekle\u015ftirmek ve genel olarak siteyi dinamikle\u015ftirmek i\u00e7in kullan\u0131lan metin tabanl\u0131 bir programlama dilidir.<\/li>\n<\/ol>\n<h2>JavaScript Neden Kullan\u0131l\u0131r?<\/h2>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-8567\" src=\"https:\/\/cdn2.limonhost.net\/wp-content\/uploads\/2021\/07\/javascript1.png\" alt=\"\" width=\"225\" height=\"225\" srcset=\"https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript1.png 225w, https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript1-150x150.png 150w, https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript1-100x100.png 100w\" sizes=\"(max-width: 225px) 100vw, 225px\" \/><\/p>\n<p>\u201cJavaScript nedir, ne i\u015fe yarar?\u201d sorular\u0131n\u0131n yan\u0131t\u0131 arand\u0131\u011f\u0131nda, JavaScript\u2019in \u00f6n y\u00fcz web geli\u015ftiricili\u011fi s\u00f6z konusu oldu\u011funda vazge\u00e7ilmez oldu\u011fu bilgisiyle kar\u015f\u0131la\u015f\u0131l\u0131r. Ancak, JavaScript \u00e7ok daha farkl\u0131 alanlarda da kullan\u0131l\u0131r. Bu alanlar aras\u0131ndan \u00f6n plana \u00e7\u0131kan 4 tanesi a\u015fa\u011f\u0131da listelenmi\u015ftir:<\/p>\n<ol>\n<li>\u00d6n y\u00fcz (Front-end) Web Geli\u015ftiricili\u011fi<\/li>\n<\/ol>\n<p>JavaScript kullan\u0131larak, daha sonra de\u011fi\u015ftirilebilir i\u00e7erikler ve kendini yeniden boyutland\u0131rabilen g\u00f6rseller gibi dinamik i\u00e7erikler olu\u015fturulabilir. Kullan\u0131c\u0131 deneyimini do\u011frudan de\u011fi\u015ftiren bu katman\u0131n (front-end) temeli JavaScript ile haz\u0131rlan\u0131r. JavaScript dili ile bir web sitesinin \u00f6n y\u00fcz\u00fcnde yap\u0131labilecek de\u011fi\u015fikliklere<\/p>\n<ul>\n<li>site i\u00e7erisine video ya da g\u00f6rsel yerle\u015ftirmek,<\/li>\n<li>site i\u00e7eri\u011fine yak\u0131nla\u015ft\u0131r-uzakla\u015ft\u0131r komutlar\u0131 eklemek,<\/li>\n<li>t\u0131kland\u0131\u011f\u0131nda etkile\u015fime giren men\u00fcler\u00a0tasarlamak,<\/li>\n<li>t\u0131kland\u0131\u011f\u0131nda bilgi g\u00f6steren butonlar koymak \u00f6rnek verilebilir.<\/li>\n<\/ul>\n<ol start=\"2\">\n<li>Arka y\u00fcz (Back-end) Web Geli\u015ftiricili\u011fi<\/li>\n<\/ol>\n<p>Arka y\u00fcz geli\u015ftiricili\u011fi, sunucu \u00fczerindeki kullan\u0131c\u0131lar taraf\u0131ndan g\u00f6r\u00fcnmeyen kodlar\u0131n kullan\u0131m alan\u0131d\u0131r. JavaScript ile arka y\u00fcz taraf\u0131n\u0131 geli\u015ftirmek i\u00e7in Node.js gibi ara\u00e7larla birlikte kullan\u0131labilir.\u00a0\u00d6rne\u011fin, sayfa i\u00e7erisindeki \u00fcyelik formlar\u0131ndan gelen bilgilerin tablolarda toplanmas\u0131 i\u00e7in Node.js ve JavaScript beraber kullan\u0131l\u0131r.\u00a0 Node.js hakk\u0131nda detayl\u0131 bilgi sahibi olmak i\u00e7in <a href=\"https:\/\/www.limonhost.net\/makaleler\/nedir\/node-js-nedir-ve-avantajlari-nelerdir\/\">\u201cNode Js Nedir ve Avantajlar\u0131 Nelerdir?\u201d<\/a> ba\u015fl\u0131kl\u0131 yaz\u0131m\u0131z\u0131 okuyabilirsiniz.<\/p>\n<ol start=\"3\">\n<li>Mobil Uygulama Geli\u015ftiricili\u011fi<\/li>\n<\/ol>\n<p>Birka\u00e7 y\u0131l \u00f6ncesine kadar mobil uygulama geli\u015ftirilirken kullan\u0131lacak programlama dili i\u015fletim sistemine ba\u011fl\u0131 olarak de\u011fi\u015firken art\u0131k JavaScript kullan\u0131larak neredeyse t\u00fcm i\u015fletim sistemleri i\u00e7in mobil uygulama geli\u015ftirilebilmektedir. \u00d6zellikle Android tabanl\u0131 ak\u0131ll\u0131 telefonlarda bulunan mobil uygulamalar\u0131n \u00e7ok b\u00fcy\u00fck bir k\u0131sm\u0131 JavaScript dili kullan\u0131larak geli\u015ftirilmi\u015ftir.<\/p>\n<ol start=\"4\">\n<li>Video Oyunu Geli\u015ftiricisi<\/li>\n<\/ol>\n<p>Oyun geli\u015ftirme alan\u0131nda JavaScript\u2019e g\u00f6re daha g\u00fc\u00e7l\u00fc olan programlama dilleri bulunsa da basit oyunlar\u0131n tasar\u0131m\u0131nda JavaScript \u00f6n plana \u00e7\u0131kar. Y\u00fcksek g\u00f6rselli\u011fe sahip b\u00fcy\u00fck \u00e7apl\u0131 oyunlarda ise JavaScript tek ba\u015f\u0131na yeterli bir dil de\u011fildir.<\/p>\n<h2>JavaScript\u2019in Di\u011fer Yaz\u0131l\u0131m Dillerinden Fark\u0131 Nedir?<\/h2>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-8568\" src=\"https:\/\/cdn2.limonhost.net\/wp-content\/uploads\/2021\/07\/javascript3-300x200.jpg\" alt=\"\" width=\"600\" height=\"400\" srcset=\"https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript3-300x200.jpg 300w, https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript3-800x534.jpg 800w, https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript3-600x400.jpg 600w, https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript3-400x267.jpg 400w, https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript3.jpg 910w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<p>JavaScript ortaya \u00e7\u0131kt\u0131\u011f\u0131 g\u00fcnden itibaren internet d\u00fcnyas\u0131n\u0131 \u00f6nemli oranda etkileyen ve de\u011fi\u015ftiren bir dil olmu\u015ftur. 25 y\u0131ldan uzun s\u00fcredir kullan\u0131lan JavaScript, geni\u015f \u00f6zellik yelpazesi ve \u00f6\u011frenme kolayl\u0131\u011f\u0131 sayesinde ba\u015far\u0131s\u0131n\u0131 s\u00fcrd\u00fcrmektedir. JavaScript\u2019i di\u011fer programlama dillerinden ay\u0131ran temel farkl\u0131l\u0131klar \u015fu \u015fekilde s\u0131ralanabilir:<\/p>\n<ul>\n<li>Web taray\u0131c\u0131lar\u0131na \u00f6zg\u00fc olarak tasarlanm\u0131\u015f tek programlama dilidir.<\/li>\n<li>Stack Overflow\u2019un 2020 y\u0131l\u0131nda yapt\u0131\u011f\u0131 ara\u015ft\u0131rmaya g\u00f6re JavaScript, d\u00fcnya genelinde en \u00e7ok tercih edilen programlama dilidir.<\/li>\n<li>Stackify\u2019a g\u00f6re JavaScript, bir\u00e7ok programlama diline g\u00f6re daha kolay \u00f6\u011frenilir.<\/li>\n<li>Olduk\u00e7a h\u0131zl\u0131d\u0131r ve az yer kaplar.<\/li>\n<\/ul>\n<h2>JavaScript Nas\u0131l \u00d6\u011frenilir?<\/h2>\n<p><img decoding=\"async\" class=\"aligncenter size-full wp-image-8569\" src=\"https:\/\/cdn2.limonhost.net\/wp-content\/uploads\/2021\/07\/javascript2.png\" alt=\"\" width=\"225\" height=\"225\" srcset=\"https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript2.png 225w, https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript2-150x150.png 150w, https:\/\/www.limonhost.net\/makaleler\/wp-content\/uploads\/2021\/07\/javascript2-100x100.png 100w\" sizes=\"(max-width: 225px) 100vw, 225px\" \/><\/p>\n<p>Bir programlama dilini \u00f6\u011frenmenin bir\u00e7ok farkl\u0131 yolu bulunmakla beraber en \u00e7ok tercih edilen y\u00f6ntemlerden biri online e\u011fitimlerden faydalanmakt\u0131r. JavaScript programlama dilini \u00f6\u011fretmeyi ama\u00e7layan \u00e7ok say\u0131da e\u011fitim program\u0131 ve video serisi olsa da ger\u00e7ekten verimli olanlar\u0131 bulmak i\u00e7in titizlikle ara\u015ft\u0131rmak gerekir. E\u011fitimcilerle do\u011frudan ileti\u015fim kurulabilen kurslar sayesinde JavaScript dilinde ciddi derecede ilerlenebilir. E\u011fitimci ile ileti\u015fime ge\u00e7ilemeyen programlardan veya video serilerinden elde edilen temel bilgilerle bile \u00e7e\u015fitli oyunlar ve uygulamalar geli\u015ftirilebilir.<\/p>\n<p>&nbsp;<\/p>\n<p>Video serilerine ek olarak kod payla\u015f\u0131m siteleri de JavaScript \u00f6\u011frenmeye yard\u0131mc\u0131 olur. Bir\u00e7ok kod geli\u015ftirici yazd\u0131\u011f\u0131 kodlar\u0131 online platformlarda \u00fccretsiz olarak payla\u015f\u0131r. Bu sayede s\u00f6z dizimi ve i\u015f ak\u0131\u015f\u0131 \u00f6\u011frenilebilir ve kod yazarken gerekebilecek baz\u0131 k\u0131s\u0131mlar bu kaynaklardan al\u0131nabilir.<\/p>\n<h2>Ge\u00e7mi\u015ften G\u00fcn\u00fcm\u00fcze JavaScript<\/h2>\n<p>Bug\u00fcn kullan\u0131lan JavaScript\u2019in temelleri 1990\u2019l\u0131 y\u0131llar\u0131n en pop\u00fcler arama motoru olan Netscape Communication \u015firketinde \u00e7al\u0131\u015fan Brendan Eich taraf\u0131ndan 1995 y\u0131l\u0131nda at\u0131lm\u0131\u015ft\u0131r. \u00d6nceleri Mocha olarak adland\u0131r\u0131lan dilin ilk versiyonlar\u0131 Netscape\u2019e \u00f6zel olarak haz\u0131rlanm\u0131\u015ft\u0131r. Zamanla di\u011fer programc\u0131lar taraf\u0131ndan ilgi g\u00f6rmesiyle g\u00fcn\u00fcm\u00fczde kullan\u0131lan versiyona do\u011fru bir ge\u00e7i\u015f olmu\u015ftur.<\/p>\n<p>Olu\u015fturulan ilk versiyonun amat\u00f6rler i\u00e7in karma\u015f\u0131k olmas\u0131 nedeniyle JavaScript de\u011fi\u015fim ge\u00e7irmi\u015ftir. Bu geli\u015ftirilen versiyonlar s\u00fcresince LiveScript ismi de kullan\u0131lm\u0131\u015f fakat 1995 y\u0131l\u0131n\u0131n sonlar\u0131nda JavaScript ismine ge\u00e7ilmi\u015ftir.<\/p>\n<p>Hen\u00fcz geli\u015fmi\u015f web teknolojileri yokken, ilk zamanlarda JavaScript \u00f6zellikle web sayfas\u0131 geli\u015ftiricileri taraf\u0131ndan tercih edilen bir yaz\u0131l\u0131m diliydi. Web geli\u015ftiriciler JavaScript sayesinde statik web sitelerini geli\u015ftirme olanaklar\u0131na sahip oldular. Sitelerinde hareketli yaz\u0131lar, hareketli \u015fekiller gibi nesnelerin yarat\u0131lmas\u0131 i\u00e7in kulland\u0131lar. D\u00f6neminde her taray\u0131c\u0131 i\u00e7in ayr\u0131 kod yap\u0131s\u0131na sahip olabilmesi sebebiyle geli\u015ftiricilerine zorluk \u00e7\u0131karsa da, g\u00fcn\u00fcm\u00fczdeki g\u00fc\u00e7l\u00fc alternatifleri sebebiyle \u00e7ok k\u0131s\u0131tl\u0131 bir alanda kullan\u0131lmaktad\u0131r. \u00d6zellikle Web \u00fczerinden y\u00f6netilen a\u011f cihazlar\u0131n\u0131n y\u00f6netim sayfalar\u0131 halen do\u011fru taray\u0131c\u0131 ve JavaScript&#8217;e ihtiya\u00e7 duyabilmektedir.<\/p>\n<p>Microsoft\u2019un arama motoru Internet Explorer\u2019a kar\u015f\u0131 pazar\u0131 domine etmek isteyen Netscape taraf\u0131ndan geli\u015ftirilen JavaScript, \u015firket i\u00e7in bu alanda ba\u015far\u0131 getirmese de en temel programlama dillerinden biri olarak tarihteki yerini alm\u0131\u015ft\u0131r ve en s\u0131k tercih edilen programlama dili olarak yerini korumaktad\u0131r.<\/p>\n<h2>Web Sitesine Javascript Nas\u0131l Eklenir?<\/h2>\n<p>&nbsp;<\/p>\n<p>Bir websitesine JavaScript kodu eklemenin iki yolu bulunmaktad\u0131r: \u201cDo\u011frudan Ekleme\u201d ve \u201cHarici Dosya Ekleme\u201d. Bu ikisi aras\u0131ndan en \u00e7ok tercih edilen ise \u201cHarici Dosya Ekleme\u201d y\u00f6ntemidir.<\/p>\n<p>Do\u011frudan kod ekleme y\u00f6nteminde, geli\u015ftirilen kodlar\u0131n tamam\u0131 &lt;script&gt;&lt;\/script&gt; etiketinin i\u00e7ine yaz\u0131l\u0131r. Haz\u0131rlanan kodun site i\u00e7erisindeki \u00e7\u0131kt\u0131s\u0131 (g\u00f6r\u00fcn\u00fcm\u00fc) HTML dosyas\u0131nda yerle\u015ftirilen yere g\u00f6re de\u011fi\u015fiklik g\u00f6sterir. &lt;head&gt; etiketiyle yaz\u0131lan kodlar JavaScript b\u00f6l\u00fcm\u00fcn\u00fcn, kodun di\u011fer k\u0131s\u0131mlar\u0131ndan ayr\u0131 tutulmas\u0131n\u0131 sa\u011fl\u0131yor olsa da, &lt;body&gt; etiketiyle girilen kodlar sayfan\u0131n daha h\u0131zl\u0131 y\u00fcklenmesini sa\u011flad\u0131\u011f\u0131 i\u00e7in genellikle &lt;body&gt; &lt;\/body&gt; etiketleri aras\u0131ndaki b\u00f6l\u00fcm kullan\u0131l\u0131r.<\/p>\n<p>A\u015fa\u011f\u0131da bir olay i\u015fleyici kodunun \u00f6rne\u011fi bulunmaktad\u0131r.<\/p>\n<p>&nbsp;<\/p>\n<p>&lt;script&gt;<\/p>\n<p>window.addEventListener(&#8216;load&#8217;, function () {<\/p>\n<p>console.log(&#8216;This function is executed once the user clicked&#8217;);<\/p>\n<p>});<\/p>\n<p>&lt;\/script&gt;<\/p>\n<p>Daha \u00f6nce bahsedildi\u011fi gibi do\u011frudan HTML dosyas\u0131na kod yazmak site performans\u0131n\u0131 art\u0131rabilece\u011fi gibi yanl\u0131\u015f uygulamalarda h\u0131z ve y\u00fcklenmeme problemleri de yaratabilmektedir. Ayn\u0131 zamanda ayn\u0131 kod par\u00e7as\u0131n\u0131n birden fazla kez kullan\u0131lmas\u0131, s\u0131kl\u0131kla kar\u015f\u0131la\u015f\u0131lan problemlerden biridir. Bu nedenle ayr\u0131 bir dosyada haz\u0131rlanan JavaScript kod dosyalar\u0131n\u0131 HTML dosyas\u0131na tan\u0131tmak, dosyan\u0131n daha d\u00fczenli olmas\u0131na katk\u0131 sa\u011flayacak ve sayfa d\u00fczenleme s\u00fcresini de k\u0131saltacakt\u0131r.<\/p>\n<p>Haz\u0131rlanan JavaScript belgeleri HTML \u00fczerinde referans verilerek tan\u0131t\u0131l\u0131r. Bu sayede okunmas\u0131 ve takip edilmesi daha kolay dosyalara sahip olunur.\u00a0 A\u015fa\u011f\u0131daki kod par\u00e7as\u0131 HTML dosyas\u0131na d\u0131\u015far\u0131dan dosya eklemek i\u00e7in kullan\u0131labilir.<\/p>\n<p>&lt;script src=&#8221;my\/first\/script.js&#8221;&gt;&lt;\/script&gt;<\/p>\n<h2>JavaScript Fonksiyonlar\u0131<\/h2>\n<p>Fonksiyon, belirli bir say\u0131daki veriyi kullanarak i\u015fleyen ve sonu\u00e7 \u00fcreten komut grubudur. Her bir fonksiyonun belirli bir ad\u0131 ve i\u00e7erisindeki de\u011ferleri g\u00f6steren parametreleri bulunur. Fakat her fonksiyonun parametresi olmak zorunda de\u011fildir. Parametresiz fonksiyonlar olarak bilenen bu kategorideki kodlar, herhangi bir de\u011fi\u015fkene gerek duymadan yaln\u0131zca i\u00e7erisindeki kodu \u00e7al\u0131\u015ft\u0131r\u0131r ve sonucunu g\u00f6sterir. Fonksiyonlar\u0131n genel \u00f6zellikleri a\u015fa\u011f\u0131daki gibi s\u0131ralanabilir:<\/p>\n<ul>\n<li>Fonksiyonlar belirli bir amaca hizmet eder.<\/li>\n<li>Method, prosed\u00fcr gibi farkl\u0131 isimlerle kullan\u0131l\u0131rlar.<\/li>\n<li>Fonksiyonlar sayesinde yap\u0131lacak i\u015fler ufak par\u00e7alara b\u00f6l\u00fcnebilir ve olu\u015fturma kolayl\u0131\u011f\u0131 sa\u011flan\u0131r.<\/li>\n<li>Bir fonksiyon \u00e7al\u0131\u015ft\u0131r\u0131ld\u0131\u011f\u0131 zaman, bir i\u015flemi geri getirmesi ya da bir de\u011fer getirmesi beklenir.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript Nedir? JavaScript, \u00f6zellikle haz\u0131r web sitelerinde kullan\u0131c\u0131lar i\u00e7in etkile\u015fimli ve dinamik bir hale getirmek amac\u0131yla hem sunucu hem de istemci taraf\u0131nda kullan\u0131lan metin tabanl\u0131 bir programlama dilidir. Her g\u00fcn kullan\u0131lan ve hayat\u0131n \u00f6nemli birer par\u00e7as\u0131 hale gelen uygulamalar\u0131n \u00e7o\u011fu JavaScript dilinde kodlanm\u0131\u015ft\u0131r. Web sitelerine HTML ile CSS kullan\u0131larak yap\u0131 ve stil kazand\u0131r\u0131l\u0131rken JavaScript ile [&hellip;]<\/p>\n","protected":false},"author":261,"featured_media":8566,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v20.11 (Yoast SEO v21.8.1) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>JavaScript Nedir? 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