{"id":149,"date":"2019-07-26T14:40:25","date_gmt":"2019-07-26T14:40:25","guid":{"rendered":"https:\/\/www.webhozz.com\/code\/?p=149"},"modified":"2019-09-03T11:48:59","modified_gmt":"2019-09-03T11:48:59","slug":"js-membuat-file-pertama","status":"publish","type":"post","link":"https:\/\/www.webhozz.com\/code\/js-membuat-file-pertama\/","title":{"rendered":"JavaScript : Membuat File Pertama"},"content":{"rendered":"\n<p>Di sini, kalian akan belajar betapa mudahnya menambahkan interaktivitas ke halaman web menggunakan JavaScript. Tapi, sebelum kita mulai, pastikan kalian telah memiliki pengetahuan tentang HTML dan CSS.<\/p>\n\n\n\n<p>Mari kita mulai pembahasannya.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Menambahkan JavaScript ke Halaman Web<\/h4>\n\n\n\n<p>Biasanya ada tiga cara untuk menambahkan JavaScript ke halaman web:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Menyematkan (embed) kode JavaScript di antara sepasang tag &lt;script&gt; dan &lt;\/script&gt;.<\/li><li>Membuat file JavaScript eksternal dengan ekstensi .js dan kemudian memuatnya di dalam halaman melalui atribut src dari tag &lt;script&gt;.<\/li><li>Menempatkan kode JavaScript langsung di dalam tag HTML menggunakan atribut tag khusus seperti onclick, onmouseover, onkeypress, onload, dll.<\/li><\/ul>\n\n\n\n<p>Bagian berikut akan menjelaskan masing-masing prosedur ini secara terperinci:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Embedding Kode JavaScript<\/h4>\n\n\n\n<p>Kalian dapat menyematkan kode JavaScript langsung di halaman web Kalian dengan menempatkannya di antara tag &lt;script&gt; dan &lt;\/script&gt;. Tag &lt;script&gt; menunjukkan browser bahwa pernyataan yang terkandung harus ditafsirkan sebagai skrip yang dapat dieksekusi dan bukan HTML. Berikut contohnya:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\n&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n    &lt;meta charset=&quot;UTF-8&quot;&gt;\n    &lt;title&gt;Embedding JavaScript&lt;\/title&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n    &lt;script&gt;\n    var greet = &quot;Hello World!&quot;;\n    document.write(greet); \/\/ Prints: Hello World!\n    &lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre><\/div>\n\n\n<p>Kode JavaScript pada contoh di atas hanya akan mencetak pesan teks pada halaman web. <\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Memanggil File External JavaScript<\/h4>\n\n\n\n<p>Kalian juga dapat menempatkan kode JavaScript ke file yang terpisah dengan ekstensi .js, dan kemudian memanggil file itu dalam dokumen kalian melalui atribut src dari tag &lt;script&gt;, seperti berikut:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\n&lt;script src=&quot;js\/hello.js&quot;&gt;&lt;\/script&gt;\n<\/pre><\/div>\n\n\n<p>Ini berguna jika kalian ingin skrip yang sama tersedia untuk\nbanyak dokumen. Ini dapat membantu kalian dari pengulangan tugas yang sama\nberulang-ulang, dan membuat situs web kalian lebih mudah dipelihara.<\/p>\n\n\n\n<p>Baiklah, mari kita buat file JavaScript bernama &#8220;hello.js&#8221; dan tempatkan kode berikut di dalamnya:&nbsp;&nbsp; <\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\n\/\/ A function to display a message\nfunction sayHello() {\n    alert(&quot;Hello World!&quot;);\n}\n\n\/\/ Call function on click of the button\ndocument.getElementById(&quot;myBtn&quot;).onclick = sayHello;\n<\/pre><\/div>\n\n\n<p>Sekarang, kalian dapat memanggil file JavaScript eksternal ini pada halaman web menggunakan tag &lt;script&gt;, seperti ini:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\n&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n    &lt;meta charset=&quot;UTF-8&quot;&gt;\n    &lt;title&gt;Including External JavaScript File&lt;\/title&gt;        \n&lt;\/head&gt;\n&lt;body&gt;    \n    &lt;button type=&quot;button&quot; id=&quot;myBtn&quot;&gt;Click Me&lt;\/button&gt;\n    &lt;script src=&quot;js\/hello.js&quot;&gt;&lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre><\/div>\n\n\n<h4 class=\"wp-block-heading\">Menempatkan Inline Kode JavaScript<\/h4>\n\n\n\n<p>Kalian juga dapat menempatkan kode inline JavaScript dengan menyisipkannya langsung di dalam tag HTML menggunakan atribut tag khusus seperti onclick, onmouseover, onkeypress, onload, dll. Berikut contoh kodenya:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: jscript; title: ; notranslate\" title=\"\">\n&lt;!DOCTYPE html&gt;\n&lt;html lang=&quot;en&quot;&gt;\n&lt;head&gt;\n    &lt;meta charset=&quot;UTF-8&quot;&gt;\n    &lt;title&gt;Inlining JavaScript&lt;\/title&gt;        \n&lt;\/head&gt;\n&lt;body&gt;    \n    &lt;button onclick=&quot;alert('Hello World!')&quot;&gt;Click Me&lt;\/button&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre><\/div>\n\n\n<p>Contoh di atas akan menampilkan pesan peringatan pada klik elemen tombol.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Penempatan Script dalam Dokumen HTML<\/h4>\n\n\n\n<p>Elemen &lt;script&gt; dapat ditempatkan di bagian &lt;head&gt;, atau &lt;body&gt; dari dokumen HTML. Namun idealnya, skrip harus ditempatkan di akhir bagian body, tepat sebelum tag penutup &lt;\/body&gt;, itu akan membuat halaman web kalian lebih cepat dimuat, karena mencegah penghambatan rendering halaman awal, jadi tidak terbebani waktu untuk memuat kode JavaScript terlebih dahulu.<\/p>\n\n\n\n<p>Setiap tag &lt;script&gt; akan memblokir proses pembuatan halaman hingga sepenuhnya ter-unduh dan mengeksekusi kode JavaScript, jadi menempatkannya di bagian kepala (mis. Elemen &lt;head&gt;) dari dokumen tanpa alasan yang jelas akan secara signifikan memengaruhi kinerja situs web kalian.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Perbedaan Antara Skrip Client-side dan Server-side<\/h4>\n\n\n\n<p>Bahasa skrip client-side &nbsp;seperti JavaScript, VBScript, dll. Ditafsirkan dan dieksekusi oleh browser web, sementara bahasa skrip server-side seperti PHP, ASP, Java, Python, Ruby, dll. Berjalan di server web dan output dikirim kembali ke browser web dalam format HTML.<\/p>\n\n\n\n<p>Skrip client-side memiliki banyak keunggulan dibandingkan pendekatan skrip server-side tradisional. Misalnya, kalian dapat menggunakan JavaScript untuk memeriksa apakah pengguna telah memasukkan data yang tidak valid pada formulir dan menunjukkan pemberitahuan untuk kesalahan input yang sesuai secara real-time sebelum mengirimkan formulir ke server web untuk validasi data akhir dan pemrosesan lebih lanjut untuk mencegah penggunaan bandwidth yang tidak perlu dan eksploitasi sumber daya sistem server.<\/p>\n\n\n\n<p>Selain itu, respons dari skrip server-side lebih lambat\ndibandingkan dengan skrip client-side, karena skrip server-side diproses pada\nkomputer jarak jauh (remote computer) bukan pada komputer lokal pengguna (user\nlocal computer).<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Di sini, kalian akan belajar betapa mudahnya menambahkan interaktivitas ke halaman web menggunakan JavaScript. Tapi, sebelum kita mulai, pastikan kalian telah memiliki pengetahuan tentang HTML<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-149","post","type-post","status-publish","format-standard","hentry","category-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Belajar JavaScript : Membuat File Pertama - WebHozz Code<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.webhozz.com\/code\/js-membuat-file-pertama\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Belajar JavaScript : Membuat File Pertama - WebHozz Code\" \/>\n<meta property=\"og:description\" content=\"Di sini, kalian akan belajar betapa mudahnya menambahkan interaktivitas ke halaman web menggunakan JavaScript. 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