{"id":82139,"date":"2026-01-28T09:00:00","date_gmt":"2026-01-28T00:00:00","guid":{"rendered":"https:\/\/www.creationline.com\/tech-blog\/?p=82139"},"modified":"2026-02-03T17:03:16","modified_gmt":"2026-02-03T08:03:16","slug":"%e4%bf%a1%e9%a0%bc%e3%81%a7%e3%81%8d%e3%81%aa%e3%81%84%e3%82%af%e3%83%a9%e3%82%a4%e3%82%a2%e3%83%b3%e3%83%88%e3%82%b5%e3%82%a4%e3%83%89javascript%e3%82%b3%e3%83%bc%e3%83%89%e3%81%8c%e5%a4%96%e9%83%a8","status":"publish","type":"post","link":"https:\/\/www.creationline.com\/tech-blog\/microservices\/frontend_development\/82139","title":{"rendered":"\u4fe1\u983c\u3067\u304d\u306a\u3044\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b5\u30a4\u30c9JavaScript\u30b3\u30fc\u30c9\u304c\u5916\u90e8\u306b\u60c5\u5831\u3092\u9001\u4fe1\u3059\u308b\u3053\u3068\u3092\u9632\u3050"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u306f\u3058\u3081\u306b<\/h2>\n\n\n\n<p>\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u30e9\u30a4\u30d6\u30e9\u30ea (<a href=\"https:\/\/nodejs.org\/ja\" target=\"_blank\" rel=\"noreferrer noopener\">Node.js<\/a>\u306a\u3069\u3001\u30d6\u30e9\u30a6\u30b6\u5916\u3067\u52d5\u4f5c\u3059\u308b\u30e9\u30a4\u30d6\u30e9\u30ea) \u306e\u30b5\u30d7\u30e9\u30a4\u30c1\u30a7\u30fc\u30f3\u653b\u6483\u304c\u4e16\u9593\u3092\u9a12\u304c\u305b\u307e\u3057\u305f\u304c\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b5\u30a4\u30c9\u30e9\u30a4\u30d6\u30e9\u30ea (Web\u30d6\u30e9\u30a6\u30b6\u3067\u52d5\u4f5c\u3059\u308b\u30e9\u30a4\u30d6\u30e9\u30ea) \u306e\u30b5\u30d7\u30e9\u30a4\u30c1\u30a7\u30fc\u30f3\u653b\u6483\u3082\u5927\u304d\u306a\u8105\u5a01\u3067\u3059\u3002\u4eca\u56de\u3001\u79c1\u306f\u4fe1\u983c\u3067\u304d\u306a\u3044\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30b5\u30a4\u30c9\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u5b89\u5168\u306b\u5b9f\u884c\u3059\u308b\u65b9\u6cd5\u304c\u306a\u3044\u304b\u8abf\u3079\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u5bfe\u8c61\u3068\u3059\u308b\u653b\u6483<\/h2>\n\n\n\n<p>\u4eca\u56de\u306f\u3001\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u542b\u307e\u308c\u308b\u60aa\u610f\u306e\u3042\u308b\u30b3\u30fc\u30c9\u306b\u3088\u3063\u3066\u3001\u610f\u56f3\u305b\u305a\u60c5\u5831\u304c\u5916\u90e8\u306b\u9001\u4fe1\u3055\u308c\u3066\u3057\u307e\u3046\u30ea\u30b9\u30af\u3092\u5bfe\u8c61\u3068\u3057\u307e\u3059\u3002\u4f1a\u54e1\u767b\u9332\u30da\u30fc\u30b8\u306b\u30d1\u30b9\u30ef\u30fc\u30c9\u81ea\u52d5\u751f\u6210\u6a5f\u80fd\u3092\u4f7f\u3046\u305f\u3081\u3001\u30d1\u30b9\u30ef\u30fc\u30c9\u751f\u6210\u30e9\u30a4\u30d6\u30e9\u30ea\u3092\u6d3b\u7528\u3059\u308b\u3068\u3057\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u305d\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u306b\u306f\u751f\u6210\u3057\u305f\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u5916\u90e8\u306b\u9001\u4fe1\u3057\u3066\u3057\u307e\u3046\u3068\u3044\u3046\u3001\u60aa\u610f\u306e\u3042\u308b\u30b3\u30fc\u30c9\u304c\u6df7\u5165\u3057\u3066\u3044\u307e\u3057\u305f\u3002\u305d\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3092\u4eee\u5b9a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"js\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ evil-pwgen.js\nexport const pwgen = (length) => {\n  const letters = 'abcdefghijklmnopqrstuvwxyz';\n  const numbers = '0123456789';\n  const source = letters + letters.toUpperCase() + numbers;\n  let password = '';\n  for (var i = 0; i &lt; length; i++) {\n    password += source.charAt(Math.floor(Math.random() * source.length));\n  }\n\n  \/\/ \u60aa\u610f\u306e\u3042\u308b\u30b3\u30fc\u30c9: \u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u4f5c\u3063\u305f\u3089\u3001\u547c\u3073\u51fa\u3057\u5143\u306b\u8fd4\u3059\u524d\u306b\u5916\u90e8\u306b\u9001\u4fe1\u3059\u308b\n  fetch(`http:\/\/localhost:30001\/?pw=${password}`);\n  return password;\n};<\/pre>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"js\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ index.js\nimport { pwgen } from '.\/evil-pwgen.js';\ndocument.addEventListener('DOMContentLoaded', () => {\n  const buttonAutogen = document.querySelector('input[type=button]');\n  const inputPassword = document.querySelector('input[type=password]');\n  buttonAutogen.addEventListener('click', () => {\n    inputPassword.value = pwgen(16);\n  }); \n}); <\/pre>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"css\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/* index.css *\/\nform { display: flex; flex-direction: column; max-width: 30%; }\n<\/pre>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"html\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">&lt;!DOCTYPE html>\n&lt;html>\n  &lt;head>\n    &lt;title>\u4f1a\u54e1\u767b\u9332&lt;\/title>\n    &lt;link rel=\"stylesheet\" href=\"index.css\"\/>\n    &lt;script type=\"module\" src=\"index.js\">&lt;\/script>\n  &lt;\/head>\n  &lt;body>\n    &lt;h1>\u4f1a\u54e1\u767b\u9332&lt;\/h1>\n    &lt;form>\n      &lt;label>\u30e6\u30fc\u30b6\u30fc\u540d&lt;\/label>\n      &lt;input type=\"text\"\/>\n      &lt;label>\u30d1\u30b9\u30ef\u30fc\u30c9&lt;\/label>\n      &lt;input type=\"button\" value=\"\u81ea\u52d5\u751f\u6210\u3059\u308b\"\/>\n      &lt;input type=\"password\"\/>\n      &lt;input type=\"submit\" value=\"\u767b\u9332\u3059\u308b\"\/>\n    &lt;\/form>\n  &lt;\/body>\n&lt;\/html>\n<\/pre>\n\n\n\n<p>\u3053\u306e\u30da\u30fc\u30b8 (index.html) \u3092\u30d6\u30e9\u30a6\u30b6\u3067\u958b\u304f\u3068\u6b21\u306e\u3088\u3046\u306a\u30d5\u30a9\u30fc\u30e0\u304c\u8868\u793a\u3055\u308c\u307e\u3059:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-68-1024x576.png\" alt=\"\" class=\"wp-image-82145\" srcset=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-68-1024x576.png 1024w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-68-360x203.png 360w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-68-460x260.png 460w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-68-768x432.png 768w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-68-512x288.png 512w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-68.png 1056w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u958b\u767a\u8005\u30b3\u30f3\u30bd\u30fc\u30eb\u3092\u958b\u3044\u305f\u72b6\u614b\u3067\u300c\u81ea\u52d5\u751f\u6210\u3059\u308b\u300d\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u751f\u6210\u3055\u308c\u305f\u30d1\u30b9\u30ef\u30fc\u30c9\u304cfetch()\u306b\u3088\u308a\u9001\u4fe1\u3055\u308c\u308b\u306f\u305a\u3067\u3059:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"266\" src=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-69-1024x266.png\" alt=\"\" class=\"wp-image-82146\" srcset=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-69-1024x266.png 1024w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-69-360x94.png 360w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-69-768x200.png 768w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-69.png 1308w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u5bfe\u7b56<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Content-Security-Policy \u30d8\u30c3\u30c0\u30fc\u3092\u4f7f\u3046<\/h3>\n\n\n\n<p>Web\u30b5\u30fc\u30d0\u30fc\u5074\u3067 <a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/HTTP\/Guides\/CSP\" target=\"_blank\" rel=\"noreferrer noopener\">Content-Security-Policy<\/a> \u30d8\u30c3\u30c0\u30fc\u3092\u9069\u5207\u306b\u8a2d\u5b9a\u3059\u308b\u3068\u3001\u4e88\u671f\u3057\u306a\u3044\u30aa\u30ea\u30b8\u30f3\u304b\u3089\u306e\u30ea\u30bd\u30fc\u30b9\u306e\u8aad\u307f\u8fbc\u307f (\u8a00\u3044\u63db\u3048\u308b\u3068\u3001\u4e88\u671f\u3057\u306a\u3044\u30aa\u30ea\u30b8\u30f3\u3078\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u9001\u4fe1) \u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/expressjs.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">express<\/a>\u3067\u306e\u4f8b:<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">import express from 'express'\n\nconst app = express()\nconst port = 30000\n\napp.use((req, res, next) => {\n  res.set({'Content-Security-Policy': \"default-src 'self'\"});\n  next();\n})\napp.use(express.static('..\/frontend'));\napp.get('\/', (req, res) => {\n  res.send('Hello World!')\n})\n\nawait app.listen(port, () => {\n  console.log(`Example app listening on port ${port}`)\n})\n<\/pre>\n\n\n\n<p>Content-Security-Policy \u30d8\u30c3\u30c0\u306b <code>default-src 'self'<\/code> \u3092\u30bb\u30c3\u30c8\u3057\u305f\u72b6\u614b\u3067\u300c\u81ea\u52d5\u751f\u6210\u3059\u308b\u300d\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b\u3068\u3001<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/Fetch_API\" target=\"_blank\" rel=\"noreferrer noopener\">fetch()<\/a> \u304c\u5931\u6557\u3059\u308b\u306f\u305a\u3067\u3059\u3002\u3053\u308c\u3067\u30d1\u30b9\u30ef\u30fc\u30c9\u304c\u5916\u90e8\u306b\u9001\u4fe1\u3055\u308c\u308b\u5fc3\u914d\u304c\u306a\u304f\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"163\" src=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-70-1024x163.png\" alt=\"\" class=\"wp-image-82150\" srcset=\"https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-70-1024x163.png 1024w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-70-360x57.png 360w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-70-768x122.png 768w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-70-1536x244.png 1536w, https:\/\/www.creationline.com\/tech-blog\/cms_x3GWkuX\/wp-content\/uploads\/2026\/01\/image-70-2048x325.png 2048w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">fetch() \u3092\u7121\u52b9\u5316\u3059\u308b<\/h3>\n\n\n\n<p>JavaScript\u3067\u306f\u3001fetch() \u3092\u4e0a\u66f8\u304d\u3057\u3066\u7121\u52b9\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u305d\u306e\u307e\u307e fetch() \u3092\u4e0a\u66f8\u304d\u3057\u3066\u3057\u307e\u3046\u3068\u3001\u81ea\u5206\u3067\u4f5c\u6210\u3057\u305f\u30b3\u30fc\u30c9\u3067\u3082fetch()\u3092\u4f7f\u3048\u306a\u304f\u306a\u3063\u3066\u3057\u307e\u3046\u305f\u3081\u3001<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/Web_Workers_API\/Using_web_workers\" target=\"_blank\" rel=\"noreferrer noopener\">Web Worker<\/a>\u3092\u4f5c\u6210\u3057\u3001\u305d\u306e\u4e2d\u306efetch()\u3092\u4e0a\u66f8\u304d\u3057\u3001\u305d\u3053\u3067\u4fe1\u983c\u3067\u304d\u306a\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u884c\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u51e6\u7406\u306e\u6d41\u308c\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30a4\u30f3\u30b9\u30ec\u30c3\u30c9: Worker\u3092\u8d77\u52d5\u3059\u308b<\/li>\n\n\n\n<li>Worker: fetch() \u3092\u7121\u52b9\u5316\u3059\u308b<\/li>\n\n\n\n<li>\u30e1\u30a4\u30f3\u30b9\u30ec\u30c3\u30c9: \u30e6\u30fc\u30b6\u30fc\u304c \u300c\u81ea\u52d5\u751f\u6210\u3059\u308b\u300d\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3059\u308b<\/li>\n\n\n\n<li>\u30e1\u30a4\u30f3\u30b9\u30ec\u30c3\u30c9: Worker\u306b<a href=\"https:\/\/developer.mozilla.org\/ja\/docs\/Web\/API\/Worker\/postMessage\" target=\"_blank\" rel=\"noreferrer noopener\">postMessage()<\/a> \u3059\u308b<\/li>\n\n\n\n<li>Worker: evil-pwgen.js \u306e pwgen() \u3092\u547c\u3073\u51fa\u3059<\/li>\n\n\n\n<li>Worker: pwgen() \u3067 fetch() \u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u4f8b\u5916\u304c\u767a\u751f\u3059\u308b<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"js\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ index.js\ndocument.addEventListener('DOMContentLoaded', () => {\n  const worker = new Worker('index-safe.worker.js', {type: 'module'});\n  let pwgenResolve = undefined;\n  const pwgen = async (length) => {\n    return new Promise((resolve) => {\n      worker.postMessage({parameters: [length]});\n      pwgenResolve = resolve;\n    }); \n  };  \n  window.addEventListener('message', (event) => {\n    pwgenResolve(event.data); \n  }); \n  const buttonAutogen = document.querySelector('input[type=button]');\n  const inputPassword = document.querySelector('input[type=password]');\n  buttonAutogen.addEventListener('click', async () => {\n    inputPassword.value = await pwgen(16);\n  }); \n});<\/pre>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"js\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ index.worker.js\n\/\/ fetch \u3092\u7121\u52b9\u5316\u3059\u308b\n\/\/ XMLHttpRequest \u3082\u7121\u52b9\u5316\u3057\u305f\u307b\u3046\u304c\u826f\u3044\u304b\u3082\u3057\u308c\u306a\u3044\nself.fetch = () => {\n  throw Error(\"fetch() is disabled!\");\n};\n\n\/\/ \u9759\u7684import \u3057\u305f\u3060\u3051\u3067\u30b3\u30fc\u30c9\u304c\u5b9f\u884c\u3055\u308c\u308b\u30ea\u30b9\u30af\u304c\u3042\u308b\u305f\u3081\u3001fetch() \u7121\u52b9\u5316\u5f8c\u306b\u52d5\u7684\u306bimport\u3059\u308b\nconst { pwgen } = await import('.\/evil-pwgen.js');\nself.addEventListener('message', (event) => {\n  self.postMessage({response: pwgen(event.data.parameters[0])});\n});<\/pre>\n\n\n\n<p>\u3053\u306e\u72b6\u614b\u3067\u300c\u81ea\u52d5\u751f\u6210\u3059\u308b\u300d\u30dc\u30bf\u30f3\u3092\u30af\u30ea\u30c3\u30af\u3057\u3066\u3082\u3001fetch() 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