{"id":1361,"date":"2026-01-21T00:55:37","date_gmt":"2026-01-21T00:55:37","guid":{"rendered":"https:\/\/gurututorku.com\/blog\/?p=1361"},"modified":"2026-01-21T00:55:38","modified_gmt":"2026-01-21T00:55:38","slug":"belajar-js-javascript","status":"publish","type":"post","link":"https:\/\/gurututorku.com\/blog\/belajar-js-javascript\/","title":{"rendered":"Belajar JS (Javascript)"},"content":{"rendered":"\n<p>JavaScript adalah <strong>bahasa pemrograman<\/strong> yang digunakan untuk:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Memberi respon saat tombol diklik<\/li>\n\n\n\n<li>Menampilkan pesan<\/li>\n\n\n\n<li>Mengubah isi halaman tanpa reload<\/li>\n\n\n\n<li>Membuat website terasa hidup dan interaktif<\/li>\n<\/ul>\n\n\n\n<p>Contoh di kehidupan nyata:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Saat klik tombol \u201cBeli\u201d lalu muncul pesan<\/li>\n\n\n\n<li>Saat angka keranjang bertambah<\/li>\n\n\n\n<li>Saat muncul peringatan \u201cForm belum diisi\u201d<\/li>\n<\/ul>\n\n\n\n<p>Semua itu dikendalikan oleh <strong>JavaScript<\/strong>.<\/p>\n\n\n\n<p>Jika HTML adalah tubuh,<br>CSS adalah pakaian,<br>maka <strong>JavaScript adalah otak<\/strong> dari sebuah website.<\/p>\n\n\n\n<p>Sekarang kita masuk ke <strong>TAHAP 3 \u2013 HTML + CSS + JavaScript<\/strong><\/p>\n\n\n\n<p>Di tahap ini kita belajar bahwa:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u201cWebsite bukan hanya untuk dilihat,<br>tapi juga bisa <em>merespon aksi pengguna<\/em>.\u201d<\/p>\n<\/blockquote>\n\n\n\n<p>Kita akan membuat tombol <strong>Beli<\/strong> benar-benar \u201chidup\u201d:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Saat diklik \u2192 muncul pesan<\/li>\n\n\n\n<li>Kita tambahkan penghitung sederhana \u201cKeranjang: 0\u201d<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">&#x1f7e1; Langkah 1 \u2013 Membuat File JavaScript<\/h2>\n\n\n\n<p>Buat file baru di folder project:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>script.js\n<\/code><\/pre>\n\n\n\n<p>Lalu hubungkan ke <code>index.html<\/code> tepat sebelum <code>&lt;\/body&gt;<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script src=\"script.js\"&gt;&lt;\/script&gt;\n&lt;\/body&gt;\n<\/code><\/pre>\n\n\n\n<p>Penjelasan:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u201cHTML untuk struktur,<br>CSS untuk tampilan,<br>JavaScript untuk logika dan interaksi.\u201d<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">&#x1f7e1; Langkah 2 \u2013 Alert Sederhana<\/h2>\n\n\n\n<p>Isi <code>script.js<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>function beliProduk() {\n    alert(\"Produk berhasil ditambahkan ke keranjang!\");\n}\n<\/code><\/pre>\n\n\n\n<p>Lalu ubah tombol di HTML:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;button onclick=\"beliProduk()\"&gt;Beli&lt;\/button&gt;\n<\/code><\/pre>\n\n\n\n<p>Sekarang, setiap tombol <strong>Beli<\/strong> diklik \u2192 muncul pesan.<\/p>\n\n\n\n<p>Penjelasan:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>function<\/code> = membuat perintah sendiri<\/li>\n\n\n\n<li><code>onclick<\/code> = menjalankan perintah saat diklik<\/li>\n\n\n\n<li><code>alert()<\/code> = menampilkan pesan<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">&#x1f7e1; Langkah 3 \u2013 Menampilkan Jumlah Keranjang<\/h2>\n\n\n\n<p>Di bagian atas halaman (misalnya di header), tambahkan:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;p&gt;Keranjang: &lt;span id=\"cart\"&gt;0&lt;\/span&gt;&lt;\/p&gt;\n<\/code><\/pre>\n\n\n\n<p>Lalu ubah <code>script.js<\/code> menjadi:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let jumlah = 0;\n\nfunction beliProduk() {\n    jumlah = jumlah + 1;\n    document.getElementById(\"cart\").innerText = jumlah;\n    alert(\"Produk berhasil ditambahkan ke keranjang!\");\n}\n<\/code><\/pre>\n\n\n\n<p>Penjelasan:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>\u201cSetiap kali tombol diklik,<br>angka keranjang akan bertambah.\u201d<\/p>\n<\/blockquote>\n\n\n\n<p>Penjelasan sederhana:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>let jumlah = 0<\/code> \u2192 menyimpan angka<\/li>\n\n\n\n<li><code>getElementById(\"cart\")<\/code> \u2192 mengambil elemen HTML<\/li>\n\n\n\n<li><code>innerText<\/code> \u2192 mengubah isinya<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">&#x1f7e1; Langkah 4 \u2013 Memberi Pesan Dinamis<\/h2>\n\n\n\n<p>Agar lebih menarik, kita kirim nama produk.<\/p>\n\n\n\n<p>Ubah tombol HTML:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;button onclick=\"beliProduk('Kaos Polos')\"&gt;Beli&lt;\/button&gt;\n&lt;button onclick=\"beliProduk('Sepatu Sneakers')\"&gt;Beli&lt;\/button&gt;\n&lt;button onclick=\"beliProduk('Tas Ransel')\"&gt;Beli&lt;\/button&gt;\n<\/code><\/pre>\n\n\n\n<p>Ubah <code>script.js<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let jumlah = 0;\n\nfunction beliProduk(namaProduk) {\n    jumlah++;\n    document.getElementById(\"cart\").innerText = jumlah;\n    alert(namaProduk + \" berhasil ditambahkan ke keranjang!\");\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>JavaScript adalah bahasa pemrograman yang digunakan untuk: Contoh di kehidupan nyata: Semua itu dikendalikan oleh JavaScript. Jika HTML adalah tubuh,CSS adalah pakaian,maka JavaScript adalah otak dari sebuah website. Sekarang kita masuk ke TAHAP 3 \u2013 HTML + CSS + JavaScript Di tahap ini kita belajar bahwa: \u201cWebsite bukan hanya untuk dilihat,tapi juga bisa merespon aksi [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[83,38],"tags":[158,159,160],"class_list":["post-1361","post","type-post","status-publish","format-standard","hentry","category-javascript","category-tutorial-programming","tag-javascript","tag-js","tag-vanila-js"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Belajar JS (Javascript) - Gurututorku<\/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:\/\/gurututorku.com\/blog\/belajar-js-javascript\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Belajar JS (Javascript) - Gurututorku\" \/>\n<meta property=\"og:description\" content=\"JavaScript adalah bahasa pemrograman yang digunakan untuk: Contoh di kehidupan nyata: Semua itu dikendalikan oleh JavaScript. 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