{"id":12809,"date":"2025-02-18T08:45:11","date_gmt":"2025-02-18T05:45:11","guid":{"rendered":"https:\/\/fatihsoysal.com\/blog\/javascriptte-defer-ve-async-ile-performans-artisi\/"},"modified":"2025-02-18T08:45:11","modified_gmt":"2025-02-18T05:45:11","slug":"javascriptte-defer-ve-async-ile-performans-artisi","status":"publish","type":"post","link":"https:\/\/fatihsoysal.com\/blog\/javascriptte-defer-ve-async-ile-performans-artisi\/","title":{"rendered":"JavaScript’te Defer ve Async ile Performans Art\u0131\u015f\u0131"},"content":{"rendered":"

<\/p>\n

JavaScript’te Defer ve Async ile Performans Art\u0131\u015f\u0131<\/p>\n

Merhaba! Ben Fatih Soysal ve bug\u00fcn size JavaScript’te defer<\/strong> ve async<\/strong> \u00f6zelliklerinin web sitenizin performans\u0131n\u0131 nas\u0131l \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131raca\u011f\u0131n\u0131 anlataca\u011f\u0131m. Bu \u00f6zellikler, \u00f6zellikle sayfan\u0131z\u0131n h\u0131zl\u0131 y\u00fcklenmesi a\u00e7\u0131s\u0131ndan b\u00fcy\u00fck bir \u00f6nem ta\u015f\u0131yor. Bildi\u011finiz gibi, yava\u015f y\u00fcklenen bir web sitesi kullan\u0131c\u0131 deneyimini olumsuz etkiler ve arama motorlar\u0131nda s\u0131ralamada d\u00fc\u015f\u00fc\u015fe neden olabilir. Bu nedenle, JavaScript dosyalar\u0131n\u0131 do\u011fru \u015fekilde y\u00fcklemek, web sitenizin ba\u015far\u0131s\u0131 i\u00e7in kritik bir ad\u0131md\u0131r.<\/p>\n

\u00d6ncelikle, klasik bir <script><\/code> etiketinin nas\u0131l \u00e7al\u0131\u015ft\u0131\u011f\u0131n\u0131 hat\u0131rlayal\u0131m. Varsay\u0131lan olarak, taray\u0131c\u0131 bu etiketi g\u00f6rd\u00fc\u011f\u00fcnde, HTML yorumlamas\u0131n\u0131 durdurur ve belirtilen JavaScript dosyas\u0131n\u0131 indirmeye ve \u00e7al\u0131\u015ft\u0131rmaya ba\u015flar. Bu durum, \u00f6zellikle b\u00fcy\u00fck JavaScript dosyalar\u0131 s\u00f6z konusu oldu\u011funda, sayfan\u0131n renderlanmas\u0131n\u0131 geciktirebilir ve kullan\u0131c\u0131lar\u0131n sayfan\u0131z\u0131n y\u00fcklenmesini beklemelerine neden olabilir. \u0130\u015fte tam bu noktada defer<\/strong> ve async<\/strong> devreye giriyor.<\/p>\n

Defer \u00d6zniteli\u011fi<\/h2>\n

defer<\/code> \u00f6zniteli\u011fi, JavaScript dosyas\u0131n\u0131n HTML yorumlamas\u0131n\u0131n tamamlanmas\u0131n\u0131 beklemesini sa\u011flar. Ba\u015fka bir deyi\u015fle, taray\u0131c\u0131 \u00f6nce HTML’i i\u015fler ve sayfay\u0131 render eder. Daha sonra, HTML’in i\u015flenmesi tamamland\u0131ktan sonra, defer<\/code> \u00f6zniteli\u011fine sahip JavaScript dosyalar\u0131 s\u0131rayla \u00e7al\u0131\u015ft\u0131r\u0131l\u0131r. Bu sayede, sayfan\u0131n daha h\u0131zl\u0131 bir \u015fekilde y\u00fcklenmesini ve kullan\u0131c\u0131 deneyiminin iyile\u015ftirilmesini sa\u011flar. <\/p>\n

\u0130\u015fte defer<\/code> \u00f6zniteli\u011finin kullan\u0131m\u0131:<\/p>\n

<script src=\"script.js\" defer><\/script><\/code><\/p>\n

Async \u00d6zniteli\u011fi<\/h2>\n

async<\/code> \u00f6zniteli\u011fi ise defer<\/code>‘dan farkl\u0131 olarak, JavaScript dosyas\u0131n\u0131n indirme ve \u00e7al\u0131\u015ft\u0131rma i\u015flemlerini HTML yorumlamas\u0131ndan ba\u011f\u0131ms\u0131z olarak ger\u00e7ekle\u015ftirir. Bu, dosya indirme i\u015flemi tamamlan\u0131r tamamlanmaz, taray\u0131c\u0131 bunu hemen \u00e7al\u0131\u015ft\u0131r\u0131r. Ancak, async<\/code> ile y\u00fcklenen dosyalar defer<\/code> ile y\u00fcklenen dosyalar gibi s\u0131rayla \u00e7al\u0131\u015ft\u0131r\u0131lmazlar. Dolay\u0131s\u0131yla, dosyalar aras\u0131ndaki ba\u011f\u0131ml\u0131l\u0131klara dikkat edilmesi gerekir.<\/p>\n

async<\/code> \u00f6zniteli\u011finin kullan\u0131m\u0131:<\/p>\n

<script src=\"script.js\" async><\/script><\/code><\/p>\n

Hangi \u00d6zniteli\u011fi Ne Zaman Kullanmal\u0131y\u0131z?<\/h2>\n

Peki, hangi \u00f6zniteli\u011fi ne zaman kullanmal\u0131y\u0131z? Bu durum, JavaScript dosyalar\u0131n\u0131z\u0131n ba\u011f\u0131ml\u0131l\u0131klar\u0131na ve \u00e7al\u0131\u015fma s\u0131ralar\u0131na ba\u011fl\u0131d\u0131r. E\u011fer JavaScript dosyalar\u0131n\u0131z aras\u0131nda bir ba\u011f\u0131ml\u0131l\u0131k varsa (yani, bir dosya di\u011fer dosyaya ihtiya\u00e7 duyuyorsa), defer<\/code> kullanman\u0131z daha uygundur. E\u011fer dosyalar\u0131n\u0131z birbirinden ba\u011f\u0131ms\u0131zsa ve \u00e7al\u0131\u015fma s\u0131ralar\u0131n\u0131n \u00f6nemi yoksa, async<\/code> kullanabilirsiniz. Genel olarak, ba\u011f\u0131ms\u0131z dosyalar i\u00e7in async<\/code>, ba\u011f\u0131ml\u0131 dosyalar i\u00e7in defer<\/code> tercih edilir. Performans art\u0131\u015f\u0131 her iki \u00f6znitelikle de elde edilebilir, ancak do\u011fru \u00f6zniteli\u011fin se\u00e7ilmesi performans\u0131 optimize etmede kritik rol oynar.<\/p>\n

\u00d6rnek Kullan\u0131m Senaryolar\u0131<\/h2>\n

\u00d6rne\u011fin, analitik kodlar\u0131n\u0131z genellikle ba\u011f\u0131ms\u0131zd\u0131r ve \u00e7al\u0131\u015fma s\u0131ras\u0131 \u00f6nemli de\u011fildir, bu nedenle async<\/code> kullanabilirsiniz. Ancak, sayfan\u0131z\u0131n i\u015flevselli\u011fi i\u00e7in gerekli olan JavaScript dosyalar\u0131n\u0131z varsa, bunlar i\u00e7in defer<\/code> kullanmak daha do\u011fru olabilir. Bu \u015fekilde, sayfan\u0131z h\u0131zl\u0131 bir \u015fekilde y\u00fcklenir ve i\u015flevsellik daha sonra eklenir. \u00d6nemli olan, ihtiya\u00e7lar\u0131n\u0131z\u0131 do\u011fru analiz etmek ve buna g\u00f6re en uygun y\u00f6ntemi se\u00e7mektir.<\/p>\n

Sonu\u00e7<\/h2>\n

defer<\/code> ve async<\/code>, JavaScript dosyalar\u0131n\u0131 do\u011fru \u015fekilde y\u00fcklemek i\u00e7in g\u00fc\u00e7l\u00fc ara\u00e7lard\u0131r. Bu \u00f6zelliklerin do\u011fru kullan\u0131m\u0131, web sitenizin performans\u0131n\u0131 \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131rabilir ve kullan\u0131c\u0131 deneyimini iyile\u015ftirebilir. Umar\u0131m bu makale size bu konuda yard\u0131mc\u0131 olmu\u015ftur. Daha fazla bilgi i\u00e7in fatihsoysal.com<\/a> adresini ziyaret edebilirsiniz. Ayr\u0131ca, konu hakk\u0131nda daha fazla bilgi edinmek i\u00e7in a\u015fa\u011f\u0131daki kaynaklara g\u00f6z atabilirsiniz: <\/p>\n

Mastering Defer & Async Loading in JavaScript<\/a><\/p>\n

#Etiketler:<\/b> JavaScript, defer, async, performans, optimizasyon, web geli\u015ftirme, h\u0131zland\u0131rma, kodlama, web sitesi performans\u0131, kullan\u0131c\u0131 deneyimi<\/p>\n

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Ben Fatih Soysal ve bug\u00fcn size JavaScript'te defer ve async \u00f6zelliklerinin web sitenizin performans\u0131n\u0131 nas\u0131l \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131raca\u011f\u0131n\u0131 anlataca\u011f\u0131m. Bu \u00f6zellikler, \u00f6zellikle sayfan\u0131z\u0131n h\u0131zl\u0131 y\u00fcklenmesi a\u00e7\u0131s\u0131ndan b\u00fcy\u00fck bir \u00f6nem ta\u015f\u0131yor. Bildi\u011finiz gibi, yava\u015f y\u00fcklenen bir web sitesi kullan\u0131c\u0131 deneyimini olumsuz etkiler ve arama motorlar\u0131nda s\u0131ralamada d\u00fc\u015f\u00fc\u015fe neden olabilir. Bu nedenle, JavaScript dosyalar\u0131n\u0131 do\u011fru \u015fekilde y\u00fcklemek, web sitenizin ba\u015far\u0131s\u0131 i\u00e7in kritik bir ad\u0131md\u0131r.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/fatihsoysal.com\/blog\/javascriptte-defer-ve-async-ile-performans-artisi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"JavaScript'te Defer ve Async ile Performans Art\u0131\u015f\u0131\" \/>\n<meta property=\"og:description\" content=\"Merhaba! Ben Fatih Soysal ve bug\u00fcn size JavaScript'te defer ve async \u00f6zelliklerinin web sitenizin performans\u0131n\u0131 nas\u0131l \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131raca\u011f\u0131n\u0131 anlataca\u011f\u0131m. 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Bu nedenle, JavaScript dosyalar\u0131n\u0131 do\u011fru \u015fekilde y\u00fcklemek, web sitenizin ba\u015far\u0131s\u0131 i\u00e7in kritik bir ad\u0131md\u0131r.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/fatihsoysal.com\/blog\/javascriptte-defer-ve-async-ile-performans-artisi\/\" \/>\n<meta property=\"og:site_name\" content=\"Kodlar\u0131n Gizemli D\u00fcnyas\u0131\" \/>\n<meta property=\"article:published_time\" content=\"2025-02-18T05:45:11+00:00\" \/>\n<meta name=\"author\" content=\"Fatih Soysal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Yazan:\" \/>\n\t<meta name=\"twitter:data1\" content=\"Fatih Soysal\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tahmini okuma s\u00fcresi\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 dakika\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javascriptte-defer-ve-async-ile-performans-artisi\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javascriptte-defer-ve-async-ile-performans-artisi\/\"},\"author\":{\"name\":\"Fatih Soysal\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"headline\":\"JavaScript’te Defer ve Async ile Performans Art\u0131\u015f\u0131\",\"datePublished\":\"2025-02-18T05:45:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javascriptte-defer-ve-async-ile-performans-artisi\/\"},\"wordCount\":654,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#\/schema\/person\/002a254750921dcfd568a99e48240dd1\"},\"inLanguage\":\"tr\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/fatihsoysal.com\/blog\/javascriptte-defer-ve-async-ile-performans-artisi\/#respond\"]}],\"copyrightYear\":\"2025\",\"copyrightHolder\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#organization\"}},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/fatihsoysal.com\/blog\/javascriptte-defer-ve-async-ile-performans-artisi\/\",\"url\":\"https:\/\/fatihsoysal.com\/blog\/javascriptte-defer-ve-async-ile-performans-artisi\/\",\"name\":\"JavaScript'te Defer ve Async ile Performans Art\u0131\u015f\u0131\",\"isPartOf\":{\"@id\":\"https:\/\/fatihsoysal.com\/blog\/#website\"},\"datePublished\":\"2025-02-18T05:45:11+00:00\",\"description\":\"Merhaba! 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