{"id":10020,"date":"2026-10-24T15:14:26","date_gmt":"2026-10-24T12:14:26","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10014"},"modified":"2026-10-24T15:14:26","modified_gmt":"2026-10-24T12:14:26","slug":"javascript-nedir-ilk-kod","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/javascript-nedir-ilk-kod\/","title":{"rendered":"JavaScript Nedir? Taray\u0131c\u0131da \u0130lk Kodunuzu Yaz\u0131n"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">JavaScript, web sayfalar\u0131na etkile\u015fim kazand\u0131ran programlama dilidir. HTML yap\u0131y\u0131, CSS g\u00f6r\u00fcn\u00fcm\u00fc belirler; JavaScript ise sayfan\u0131n davran\u0131\u015f\u0131n\u0131 y\u00f6netir. Bir d\u00fc\u011fmeye bas\u0131nca men\u00fcn\u00fcn a\u00e7\u0131lmas\u0131, formdaki hatalar\u0131n an\u0131nda g\u00f6sterilmesi ya da sayfa yenilenmeden verinin g\u00fcncellenmesi JavaScript ile yap\u0131l\u0131r. Java ile yaln\u0131zca ad benzerli\u011fi vard\u0131r, iki ayr\u0131 dildir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">JavaScript Nerede \u00c7al\u0131\u015f\u0131r?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Taray\u0131c\u0131lar JavaScript&#8217;i do\u011frudan \u00e7al\u0131\u015ft\u0131r\u0131r, yani ayr\u0131ca bir kurulum gerekmez. Node.js ile sunucu taraf\u0131nda da kullan\u0131labilir. Bu yaz\u0131da taray\u0131c\u0131 taraf\u0131na odaklan\u0131yoruz.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0130lk Kodunuz<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Taray\u0131c\u0131da herhangi bir sayfada F12 tu\u015funa bas\u0131n ve <strong>Konsol (Console)<\/strong> sekmesini a\u00e7\u0131n. \u015eunu yaz\u0131p Enter&#8217;a bas\u0131n:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>console.log(\"Merhaba D\u00fcnya\");<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Konsolda yaz\u0131y\u0131 g\u00f6r\u00fcrs\u00fcn\u00fcz. <code>console.log()<\/code> hata ay\u0131klamada en \u00e7ok kullan\u0131lan komuttur.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sayfaya JavaScript Eklemek<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html&gt;\n&lt;html lang=\"tr\"&gt;\n&lt;head&gt;\n    &lt;meta charset=\"UTF-8\"&gt;\n    &lt;title&gt;JS Deneme&lt;\/title&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n    &lt;button id=\"dugme\"&gt;T\u0131kla&lt;\/button&gt;\n    &lt;p id=\"mesaj\"&gt;&lt;\/p&gt;\n\n    &lt;script&gt;\n        document.getElementById(\"dugme\").addEventListener(\"click\", function () {\n            document.getElementById(\"mesaj\").textContent = \"D\u00fc\u011fmeye t\u0131klad\u0131n\u0131z!\";\n        });\n    &lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Kodun anlam\u0131 \u015f\u00f6yledir: <code>getElementById<\/code> ile <code>id<\/code> de\u011feri belirli \u00f6\u011fe se\u00e7ilir. <code>addEventListener<\/code> ile o \u00f6\u011feye bir olay dinleyicisi eklenir. D\u00fc\u011fmeye t\u0131klan\u0131nca (<code>click<\/code>) fonksiyon \u00e7al\u0131\u015f\u0131r ve paragraf\u0131n metni de\u011fi\u015fir. HTML sayfas\u0131ndaki \u00f6\u011felere bu \u015fekilde eri\u015fmeye <strong>DOM<\/strong> (Document Object Model) \u00fczerinden eri\u015fim denir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">De\u011fi\u015fkenler<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Modern JavaScript&#8217;te iki ana tan\u0131m y\u00f6ntemi vard\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let sayac = 0;\nconst site = \"yunuskaytan.com\";<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>let<\/code> sonradan de\u011feri de\u011fi\u015febilen de\u011fi\u015fkenler i\u00e7indir.<\/li>\n\n<li><code>const<\/code> de\u011feri de\u011fi\u015fmeyecek sabitler i\u00e7indir.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Eski kodlarda <code>var<\/code> g\u00f6rebilirsiniz ancak yeni yaz\u0131lan kodlarda genellikle tercih edilmez.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Veri T\u00fcrleri<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>let metin = \"Merhaba\";\nlet sayi = 42;\nlet dogruMu = true;\nlet liste = [\"elma\", \"armut\", \"kiraz\"];\nlet kisi = { ad: \"Yunus\", yas: 30 };<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Fonksiyonlar<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>function topla(a, b) {\n    return a + b;\n}\n\nconsole.log(topla(3, 4));<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu kod <code>7<\/code> yazar. Ayn\u0131 i\u015fi k\u0131saca <strong>ok fonksiyonu<\/strong> ile de yazabilirsiniz:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const topla = (a, b) =&gt; a + b;<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Ko\u015ful ve D\u00f6ng\u00fc<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>let puan = 72;\n\nif (puan &gt;= 50) {\n    console.log(\"Ge\u00e7tiniz\");\n} else {\n    console.log(\"Kald\u0131n\u0131z\");\n}\n\nfor (let i = 1; i &lt;= 5; i++) {\n    console.log(i);\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">S\u0131k Yap\u0131lan Hatalar<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>==<\/code> ile <code>===<\/code> kar\u0131\u015ft\u0131rmak. <code>===<\/code> hem de\u011feri hem t\u00fcr\u00fc kar\u015f\u0131la\u015ft\u0131r\u0131r ve genellikle tercih edilmelidir.<\/li>\n\n<li>Script&#8217;i, se\u00e7meye \u00e7al\u0131\u015ft\u0131\u011f\u0131 \u00f6\u011feden \u00f6nce y\u00fcklemek. Bu durumda \u00f6\u011fe hen\u00fcz bulunmad\u0131\u011f\u0131 i\u00e7in hata al\u0131rs\u0131n\u0131z. <code>&lt;script&gt;<\/code> etiketini <code>body<\/code> sonuna koymak bunu \u00e7\u00f6zer.<\/li>\n\n<li>Konsoldaki k\u0131rm\u0131z\u0131 hata mesajlar\u0131n\u0131 okumamak. Mesaj \u00e7o\u011fu zaman sat\u0131r numaras\u0131n\u0131 da s\u00f6yler.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Sonraki Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">S\u0131ras\u0131yla diziler ve nesneler, DOM i\u015flemleri, olaylar, form do\u011frulama, <code>fetch<\/code> ile veri \u00e7ekme ve sonra Node.js konular\u0131na ge\u00e7ebilirsiniz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript&#8217;in ne oldu\u011funu, de\u011fi\u015fken ve fonksiyonlar\u0131 ve bir d\u00fc\u011fmeye t\u0131klay\u0131nca sayfay\u0131 de\u011fi\u015ftirmeyi \u00f6\u011frenin.<\/p>","protected":false},"author":1,"featured_media":10019,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[228],"tags":[208,235,246,258],"class_list":["post-10020","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-baslangic","tag-dom","tag-javascript","tag-web"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>JavaScript Nedir? 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