{"id":13069,"date":"2026-03-13T17:46:29","date_gmt":"2026-03-13T17:46:29","guid":{"rendered":"https:\/\/withcode.tech\/media\/?p=13069"},"modified":"2026-07-01T15:28:44","modified_gmt":"2026-07-01T15:28:44","slug":"react-declarative-vs-imperative-ui","status":"publish","type":"post","link":"https:\/\/withcode.tech\/media\/react-declarative-vs-imperative-ui\/","title":{"rendered":"React\u5ba3\u8a00\u7684UI\u3068\u547d\u4ee4\u7684UI\u306e\u9055\u3044\u3068\u4f7f\u3044\u5206\u3051\u65b9\u3010\u56f3\u89e3\uff06\u30b3\u30fc\u30c9\u4ed8\u304d\u5b8c\u5168\u30ac\u30a4\u30c9\u3011"},"content":{"rendered":"<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p class=\"balloon balloon-left\"><strong>React\u3092\u52c9\u5f37\u3057\u59cb\u3081\u305f\u3093\u3067\u3059\u304c\u3001\u300c\u5ba3\u8a00\u7684UI\u300d\u3068\u300c\u547d\u4ee4\u7684UI\u300d\u306e\u9055\u3044\u304c\u6b63\u76f4\u3088\u304f\u308f\u304b\u308a\u307e\u305b\u3093\u3002Vanilla JS\u3068\u3069\u3046\u9055\u3046\u3093\u3067\u3057\u3087\u3046\u304b\uff1f<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p class=\"balloon balloon-right\"><strong>\u3088\u30fc\u304f\u805e\u304f\u3093\u3060\u305e\u3002\u5ba3\u8a00\u7684UI\u3068\u547d\u4ee4\u7684UI\u306e\u9055\u3044\u306f\u3001\u300c\u8ab0\u304cDOM\u306e\u66f4\u65b0\u3092\u62c5\u5f53\u3059\u308b\u304b\u300d\u3068\u3044\u3046\u305f\u3063\u305f1\u70b9\u306e\u9055\u3044\u3058\u3083\u3002\u3053\u3053\u3092\u7406\u89e3\u3059\u308b\u3068\u3001\u306a\u305cReact\u306e\u66f8\u304d\u65b9\u304cVanilla JS\u3068\u5168\u7136\u9055\u3046\u306e\u304b\u304c\u4e00\u6c17\u306b\u8151\u306b\u843d\u3061\u308b\u3093\u3058\u3083\u3002\u4eca\u65e5\u306f\u30b3\u30fc\u30c9\u4f8b\u30fb\u6bd4\u8f03\u8868\u30fb\u5b9f\u8df5\u30d1\u30bf\u30fc\u30f35\u9078\u3092\u4f7f\u3063\u3066\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3059\u308b\u305e\u3044\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<div class=\"wp-block-group swl-box swl-box--border\"><div class=\"wp-block-group__inner-container\">\n<h2 class=\"wp-block-heading\">\u3053\u306e\u8a18\u4e8b\u3067\u308f\u304b\u308b\u3053\u3068<\/h2>\n<ul class=\"wp-block-list\">\n  <li>\u5ba3\u8a00\u7684UI\u3068\u547d\u4ee4\u7684UI\u306e\u672c\u8cea\u7684\u306a\u9055\u3044\uff08\u6bd4\u8f03\u8868\u30fb\u30b3\u30fc\u30c9\u4f8b\u4ed8\u304d\uff09<\/li>\n  <li>\u300c\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3048\u3070\u5ba3\u8a00\u7684\u300d\u3068\u3044\u3046\u8aa4\u89e3\u3068\u6b63\u3057\u3044\u5224\u65ad\u57fa\u6e96<\/li>\n  <li>React\u3067\u547d\u4ee4\u7684\u306b\u306a\u3063\u3066\u3057\u307e\u30463\u3064\u306e\u30d1\u30bf\u30fc\u30f3\u3068\u5ba3\u8a00\u7684\u306a\u66f8\u304d\u63db\u3048\u65b9<\/li>\n  <li>useRef\u30fbDOM\u64cd\u4f5c\u304c\u9069\u5207\u306a\u30b1\u30fc\u30b9\u3068\u4f8b\u5916\u306e\u898b\u6975\u3081\u65b9<\/li>\n  <li>TODO\u30ea\u30b9\u30c8\u3067\u5b66\u3076Vanilla JS\u3068React\u306e\u5b9f\u88c5\u6bd4\u8f03<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u5ba3\u8a00\u7684UI\u3068\u547d\u4ee4\u7684UI\u306e\u9055\u3044\u306f\u300cUI\u306e\u66f4\u65b0\u8cac\u4efb\u304c\u8ab0\u306b\u3042\u308b\u304b\u300d\u3068\u3044\u30461\u70b9\u3060\u3051\u3067\u3059\u3002<\/strong>\u547d\u4ee4\u7684UI\uff08Vanilla JS\uff09\u3067\u306f\u958b\u767a\u8005\u304cDOM\u306e\u66f4\u65b0\u624b\u9806\u3092\u3059\u3079\u3066\u66f8\u304d\u3001\u5ba3\u8a00\u7684UI\uff08React\uff09\u3067\u306f\u300c\u72b6\u614b\u306b\u5fdc\u3058\u305fUI\u306e\u3042\u308b\u3079\u304d\u59ff\u300d\u3092\u5ba3\u8a00\u3059\u308b\u3060\u3051\u3067\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u81ea\u52d5\u3067DOM\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002\u3053\u306e\u6982\u5ff5\u3092\u7406\u89e3\u3057\u3066\u3044\u306a\u3044\u3068\u3001React\u3092\u4f7f\u3063\u3066\u3044\u3066\u3082jQuery\u306e\u3088\u3046\u306a\u547d\u4ee4\u7684\u306a\u30b3\u30fc\u30c9\u306b\u9665\u308a\u304c\u3061\u3067\u3059\u3002<\/p>\n\n\n<p class=\"related-links\"><strong>\u3042\u308f\u305b\u3066\u8aad\u307f\u305f\u3044\uff1a<\/strong><br>\n  <a href=\"https:\/\/withcode.tech\/media\/the_strongest_roadmap\/\">\u30102026\u5e74\u7248\u3011Web\u5236\u4f5c\u30fb\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u30a8\u30f3\u30b8\u30cb\u30a2\u306b\u306a\u308b\u305f\u3081\u306e\u6700\u5f37\u30ed\u30fc\u30c9\u30de\u30c3\u30d7<\/a>\uff08\u5b66\u7fd2\u9806\u5e8f\u306e\u5168\u4f53\u50cf\uff09<br>\n  <a href=\"https:\/\/withcode.tech\/media\/\">JavaScript\u306e\u975e\u540c\u671f\u51e6\u7406\u3092\u30bc\u30ed\u304b\u3089\u7406\u89e3\u3059\u308b\uff5cPromise\u30fbasync\/await\u3092\u56f3\u89e3\u3067\u89e3\u8aac<\/a>\uff08JavaScript\u57fa\u790e\uff09\n<\/p>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5ba3\u8a00\u7684UI\u3068\u547d\u4ee4\u7684UI\uff1a\u300c\u8ab0\u304cDOM\u3092\u66f4\u65b0\u3059\u308b\u304b\u300d\u304c\u552f\u4e00\u306e\u9055\u3044<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" src=\"img\/declarative_vs_imperative_ui.png\" alt=\"\u5ba3\u8a00\u7684UI\u3068\u547d\u4ee4\u7684UI\u306e\u8cac\u4efb\u7bc4\u56f2\u306e\u9055\u3044\u3092\u793a\u3059\u56f3\" class=\"wp-image-12390\"\/><\/figure>\n<\/div>\n\n\n<pre class=\"wp-block-code\"><code>\u3010\u5ba3\u8a00\u7684UI\u3068\u547d\u4ee4\u7684UI\u306e\u672c\u8cea\u7684\u306a\u9055\u3044\u3011\n\n\u547d\u4ee4\u7684UI\uff08Vanilla JS\u30fbjQuery \u306a\u3069\uff09\n\u2192 \u300cUI\u306e\u66f4\u65b0\u306e\u8cac\u4efb\u300d\u3092\u958b\u767a\u8005\u304c\u6301\u3064\n\u2192 \u72b6\u614b\u304c\u5909\u308f\u308b\u305f\u3073\u306b\u300c\u3069\u306eDOM\u3092\u3069\u3046\u5909\u3048\u308b\u304b\u300d\u3092\u81ea\u5206\u3067\u66f8\u304f\n\n\u5ba3\u8a00\u7684UI\uff08React\u30fbVue \u306a\u3069\uff09\n\u2192 \u300cUI\u306e\u66f4\u65b0\u306e\u8cac\u4efb\u300d\u3092\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u6301\u3064\n\u2192 \u958b\u767a\u8005\u306f\u300c\u72b6\u614b\u306b\u5fdc\u3058\u3066UI\u304c\u3069\u3046\u306a\u3063\u3066\u307b\u3057\u3044\u304b\u300d\u3092\u5ba3\u8a00\u3059\u308b\u3060\u3051\n\u2192 DOM\u306e\u66f4\u65b0\u306f\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u81ea\u52d5\u3067\u884c\u3046<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u547d\u4ee4\u7684UI\uff1a\u300c\u3069\u3046\u3059\u308b\u304b\u300d\u306e\u624b\u9806\u3092\u66f8\u304f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u547d\u4ee4\u7684UI\u3067\u306f\u3001<strong>\u72b6\u614b\u304c\u5909\u308f\u3063\u305f\u3068\u304d\u3001\u3069\u306eDOM\u3092\u3069\u306e\u3088\u3046\u306b\u66f4\u65b0\u3059\u308b\u304b\u3068\u3044\u3046\u624b\u9806\u3092\u3059\u3079\u3066\u958b\u767a\u8005\u304c\u66f8\u304d\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- Vanilla JS \u306b\u3088\u308b\u547d\u4ee4\u7684UI\u306e\u4f8b\uff08\u30ed\u30b0\u30a4\u30f3\u72b6\u614b\u306e\u5207\u308a\u66ff\u3048\uff09 --&gt;\n&lt;p id=\"message\"&gt;&lt;\/p&gt;\n&lt;button id=\"btn\"&gt;\u30ed\u30b0\u30a4\u30f3&lt;\/button&gt;\n\n&lt;script&gt;\n  let isLoggedIn = false;\n  const message = document.getElementById('message');\n  const btn = document.getElementById('btn');\n\n  \/\/ DOM \u306e\u521d\u671f\u72b6\u614b\u3092\u958b\u767a\u8005\u304c\u624b\u52d5\u3067\u30bb\u30c3\u30c8\u3059\u308b\n  message.textContent = '\u30ed\u30b0\u30a4\u30f3\u3057\u3066\u304f\u3060\u3055\u3044\u3002';\n\n  btn.addEventListener('click', () => {\n    isLoggedIn = !isLoggedIn;\n\n    \/\/ \u72b6\u614b\u304c\u5909\u308f\u308b\u305f\u3073\u306b\u300c\u3069\u306eDOM\u3092\u3069\u3046\u5909\u3048\u308b\u304b\u300d\u3092\u958b\u767a\u8005\u304c\u66f8\u304f\n    if (isLoggedIn) {\n      message.textContent = '\u3088\u3046\u3053\u305d\uff01';\n      btn.textContent = '\u30ed\u30b0\u30a2\u30a6\u30c8';\n    } else {\n      message.textContent = '\u30ed\u30b0\u30a4\u30f3\u3057\u3066\u304f\u3060\u3055\u3044\u3002';\n      btn.textContent = '\u30ed\u30b0\u30a4\u30f3';\n    }\n  });\n&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u5ba3\u8a00\u7684UI\uff1a\u300c\u3069\u3046\u306a\u3063\u3066\u307b\u3057\u3044\u304b\u300d\u306e\u30b4\u30fc\u30eb\u3092\u66f8\u304f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5ba3\u8a00\u7684UI\u3067\u306f\u3001<strong>\u300c\u72b6\u614b\u304c\u3053\u306e\u5024\u306e\u3068\u304d\u3001UI\u306f\u3053\u3046\u3042\u3063\u3066\u307b\u3057\u3044\u300d\u3068\u3044\u3046\u30b4\u30fc\u30eb\u3060\u3051\u3092\u5ba3\u8a00\u3057\u307e\u3059\u3002<\/strong>DOM\u3092\u3069\u3046\u66f4\u65b0\u3059\u308b\u304b\u306fReact\u304c\u81ea\u52d5\u3067\u5224\u65ad\u3057\u3066\u304f\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ React \u306b\u3088\u308b\u5ba3\u8a00\u7684UI\u306e\u4f8b\uff08\u540c\u3058\u30ed\u30b0\u30a4\u30f3\u72b6\u614b\u306e\u5207\u308a\u66ff\u3048\uff09\nimport { useState } from 'react';\n\nfunction LoginMessage() {\n  const [isLoggedIn, setIsLoggedIn] = useState(false);\n\n  return (\n    &lt;div&gt;\n      {\/* \u72b6\u614b\u306b\u5fdc\u3058\u305fUI\u306e\u300c\u3042\u308b\u3079\u304d\u59ff\u300d\u3092\u5ba3\u8a00\u3059\u308b\u3060\u3051 *\/}\n      &lt;p&gt;{isLoggedIn ? '\u3088\u3046\u3053\u305d\uff01' : '\u30ed\u30b0\u30a4\u30f3\u3057\u3066\u304f\u3060\u3055\u3044\u3002'}&lt;\/p&gt;\n      &lt;button onClick={() =&gt; setIsLoggedIn(!isLoggedIn)}&gt;\n        {isLoggedIn ? '\u30ed\u30b0\u30a2\u30a6\u30c8' : '\u30ed\u30b0\u30a4\u30f3'}\n      &lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n}\n\/\/ isLoggedIn \u304c\u5909\u308f\u308b\u3068\u3001React\u304cDOM\u3092\u81ea\u52d5\u66f4\u65b0\u3057\u3066\u304f\u308c\u308b\n\/\/ \u958b\u767a\u8005\u306fDOM\u64cd\u4f5c\u306e\u30b3\u30fc\u30c9\u3092\u4e00\u5207\u66f8\u304b\u306a\u3044<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u5ba3\u8a00\u7684UI vs \u547d\u4ee4\u7684UI\uff1a\u4e00\u89a7\u6bd4\u8f03\u8868<\/h3>\n\n\n<table>\n  <thead>\n    <tr><th>\u89b3\u70b9<\/th><th>\u5ba3\u8a00\u7684UI\uff08React\u30fbVue\uff09<\/th><th>\u547d\u4ee4\u7684UI\uff08Vanilla JS\u30fbjQuery\uff09<\/th><\/tr>\n  <\/thead>\n  <tbody>\n    <tr><td>UI\u306e\u66f4\u65b0\u8cac\u4efb<\/td><td>\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af<\/td><td>\u958b\u767a\u8005<\/td><\/tr>\n    <tr><td>\u958b\u767a\u8005\u304c\u66f8\u304f\u3053\u3068<\/td><td>\u300c\u72b6\u614b\u306b\u5fdc\u3058\u305fUI\u306e\u3042\u308b\u3079\u304d\u59ff\u300d<\/td><td>\u300c\u3069\u306eDOM\u3092\u3069\u3046\u66f4\u65b0\u3059\u308b\u304b\u300d\u306e\u624b\u9806<\/td><\/tr>\n    <tr><td>DOM\u64cd\u4f5c<\/td><td>\u4e0d\u8981\uff08\u81ea\u52d5\u3067\u53cd\u6620\uff09<\/td><td>\u624b\u52d5\u3067\u64cd\u4f5c\u304c\u5fc5\u8981<\/td><\/tr>\n    <tr><td>\u30b3\u30fc\u30c9\u306e\u8aad\u307f\u3084\u3059\u3055<\/td><td>UI\u306e\u72b6\u614b\u304c\u898b\u305f\u76ee\u3067\u308f\u304b\u308a\u3084\u3059\u3044<\/td><td>DOM\u3068\u30ed\u30b8\u30c3\u30af\u304c\u5165\u308a\u6df7\u3058\u308a\u3084\u3059\u3044<\/td><\/tr>\n    <tr><td>\u72b6\u614b\u304c\u5897\u3048\u305f\u3068\u304d<\/td><td>JSX\u306b\u72b6\u614b\u3092\u8ffd\u52a0\u3059\u308b\u3060\u3051<\/td><td>\u5168\u72b6\u614b\u30d1\u30bf\u30fc\u30f3\u306e\u66f4\u65b0\u30b3\u30fc\u30c9\u3092\u8ffd\u52a0\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b<\/td><\/tr>\n    <tr><td>\u4e3b\u306a\u6280\u8853<\/td><td>React\u30fbVue\u30fbSvelte<\/td><td>Vanilla JS\u30fbjQuery<\/td><\/tr>\n  <\/tbody>\n<\/table>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u300c\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3048\u3070\u5ba3\u8a00\u7684UI\u300d\u306f\u9593\u9055\u3044\uff5c\u6b63\u3057\u3044\u5224\u65ad\u57fa\u6e96<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u591a\u304f\u306e\u521d\u5b66\u8005\u304c\u306f\u307e\u308b\u8aa4\u89e3\u3068\u3057\u3066\u300c\u4e09\u9805\u6f14\u7b97\u5b50\u3067\u6761\u4ef6\u5206\u5c90\u3092\u66f8\u3051\u3070\u5ba3\u8a00\u7684\u300d\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u6b63\u78ba\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" src=\"img\/declarative_misconception.png\" alt=\"\u5ba3\u8a00\u7684UI\u306b\u95a2\u3059\u308b\u3088\u304f\u3042\u308b\u8aa4\u89e3\u3092\u89e3\u8aac\u3059\u308b\u56f3\" class=\"wp-image-12391\"\/><\/figure>\n<\/div>\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u274c \u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u3044\u308b\u304c\u3001\u547d\u4ee4\u7684UI\u306e\u30b3\u30fc\u30c9\nconst isLoggedIn = true;\n\n\/\/ \u8868\u793a\u3059\u308b\u30c6\u30ad\u30b9\u30c8\u3092\u4e09\u9805\u6f14\u7b97\u5b50\u3067\u6c7a\u3081\u3066\u3044\u308b\u304c\u2026\nconst message = isLoggedIn ? '\u3088\u3046\u3053\u305d\uff01' : '\u30ed\u30b0\u30a4\u30f3\u3057\u3066\u304f\u3060\u3055\u3044\u3002';\n\n\/\/ DOM\u3078\u306e\u300c\u53cd\u6620\u65b9\u6cd5\u300d\u306f\u958b\u767a\u8005\u304c\u8a18\u8ff0\u3057\u3066\u3044\u308b \u2192 \u547d\u4ee4\u7684UI\nconst p = document.createElement('p');\np.textContent = message;\ndocument.body.appendChild(p);<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\u3010\u5ba3\u8a00\u7684\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3059\u308b1\u3064\u306e\u554f\u3044\u3011\n\n\u300cDOM\u3092\u3069\u3046\u66f4\u65b0\u3059\u308b\u304b\u3001\u3092\u958b\u767a\u8005\u304c\u66f8\u3044\u3066\u3044\u308b\u304b\uff1f\u300d\n\n\u2705 \u5ba3\u8a00\u7684UI\uff1a\n\u2192 \u958b\u767a\u8005\u306f\u300cUI\u306e\u3042\u308b\u3079\u304d\u59ff\u300d\u3060\u3051\u66f8\u304f\n\u2192 DOM\u306e\u66f4\u65b0\u65b9\u6cd5\u306f\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u5224\u65ad\u3059\u308b\n\n\u274c \u547d\u4ee4\u7684UI\uff08\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u3044\u3066\u3082\uff09\uff1a\n\u2192 \u6700\u7d42\u7684\u306b document.createElement \/ textContent \/ appendChild\n   \u306a\u3069\u3067DOM\u66f4\u65b0\u306e\u300c\u65b9\u6cd5\u300d\u3092\u958b\u767a\u8005\u304c\u66f8\u3044\u3066\u3044\u308b\n\n\u25b6 \u5224\u65ad\u306e\u672c\u8cea\u306f\u300c\u69cb\u6587\u306e\u898b\u305f\u76ee\u300d\u3067\u306f\u306a\u304f\u300cDOM\u66f4\u65b0\u306e\u8cac\u4efb\u304c\u3069\u3053\u306b\u3042\u308b\u304b\u300d<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">React\u3067\u3082\u547d\u4ee4\u7684\u306b\u306a\u308b\u30b1\u30fc\u30b9\u304c\u3042\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u91cd\u8981\u306a\u306e\u306f\u3001<strong>React\u3092\u4f7f\u3063\u3066\u3044\u3066\u3082\u547d\u4ee4\u7684\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u306f\u3067\u304d\u307e\u3059<\/strong>\u3002\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304c\u5ba3\u8a00\u7684\u306b\u66f8\u3051\u308b\u624b\u6bb5\u3092\u63d0\u4f9b\u3057\u3066\u3044\u308b\u3060\u3051\u3067\u3001\u5f37\u5236\u3057\u3066\u3044\u308b\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u274c React\u306e\u4e2d\u3067\u547d\u4ee4\u7684\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3057\u307e\u3063\u3066\u3044\u308b\u30b1\u30fc\u30b9\nimport { useEffect } from 'react';\n\nfunction BadExample() {\n  useEffect(() => {\n    \/\/ document \u3092\u76f4\u63a5\u64cd\u4f5c \u2192 \u547d\u4ee4\u7684UI\n    const el = document.getElementById('title');\n    if (el) el.textContent = '\u5909\u66f4\u5f8c\u306e\u30bf\u30a4\u30c8\u30eb';\n  }, []);\n\n  return &lt;h1 id=\"title\"&gt;\u5143\u306e\u30bf\u30a4\u30c8\u30eb&lt;\/h1&gt;;\n}\n\n\/\/ \u2705 React\u3089\u3057\u3044\u5ba3\u8a00\u7684\u306a\u30b3\u30fc\u30c9\nimport { useState } from 'react';\n\nfunction GoodExample() {\n  const [title, setTitle] = useState('\u5143\u306e\u30bf\u30a4\u30c8\u30eb');\n\n  return (\n    &lt;div&gt;\n      &lt;h1&gt;{title}&lt;\/h1&gt; {\/* React\u304cstate\u306b\u5fdc\u3058\u3066DOM\u3092\u66f4\u65b0\u3059\u308b *\/}\n      &lt;button onClick={() =&gt; setTitle('\u5909\u66f4\u5f8c\u306e\u30bf\u30a4\u30c8\u30eb')}&gt;\u5909\u66f4&lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">React\u3067\u300c\u547d\u4ee4\u7684\u300d\u306b\u306a\u3063\u3066\u3057\u307e\u30463\u3064\u306e\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" src=\"img\/react_imperative_patterns.png\" alt=\"React\u3067\u3088\u304f\u3042\u308bDOM\u306e\u76f4\u63a5\u64cd\u4f5c\u30d1\u30bf\u30fc\u30f3\u56f3\" class=\"wp-image-12392\"\/><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f31\uff1auseRef \u3067DOM\u3092\u76f4\u63a5\u66f8\u304d\u63db\u3048\u308b<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><code>useRef<\/code> \u306fDOM\u53c2\u7167\u306e\u305f\u3081\u306b\u4f7f\u3046\u30d5\u30c3\u30af\u3067\u3059\u304c\u3001<strong>\u53d6\u5f97\u3057\u305fDOM\u3092\u76f4\u63a5\u66f8\u304d\u63db\u3048\u308b\u3068\u547d\u4ee4\u7684\u306b\u306a\u308a\u307e\u3059\u3002<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import { useRef } from 'react';\n\n\/\/ \u274c useRef \u3067DOM\u3092\u76f4\u63a5\u66f8\u304d\u63db\u3048\u3066\u3044\u308b\uff08\u547d\u4ee4\u7684\uff09\nfunction BadCounter() {\n  const countRef = useRef(null);\n  let count = 0;\n\n  const handleClick = () => {\n    count++;\n    \/\/ React\u306e\u7ba1\u7406\u5916\u3067DOM\u3092\u76f4\u63a5\u5909\u66f4\u3057\u3066\u3044\u308b\n    if (countRef.current) {\n      countRef.current.textContent = `\u30ab\u30a6\u30f3\u30c8: ${count}`;\n    }\n  };\n\n  return (\n    &lt;div&gt;\n      &lt;p ref={countRef}&gt;\u30ab\u30a6\u30f3\u30c8: 0&lt;\/p&gt;\n      &lt;button onClick={handleClick}&gt;+1&lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n}\n\n\/\/ \u2705 useState \u3067\u5ba3\u8a00\u7684\u306b\u66f8\u304f\nimport { useState } from 'react';\n\nfunction GoodCounter() {\n  const [count, setCount] = useState(0);\n\n  return (\n    &lt;div&gt;\n      &lt;p&gt;\u30ab\u30a6\u30f3\u30c8: {count}&lt;\/p&gt;\n      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;+1&lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f32\uff1auseEffect \u5185\u3067DOM\u3092\u76f4\u63a5\u64cd\u4f5c\u3059\u308b<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>import { useEffect, useState } from 'react';\n\n\/\/ \u274c useEffect \u5185\u3067DOM\u3092\u76f4\u63a5\u64cd\u4f5c\uff08\u547d\u4ee4\u7684\uff09\nfunction BadThemeToggle() {\n  const [isDark, setIsDark] = useState(false);\n\n  useEffect(() => {\n    \/\/ React\u306e\u7ba1\u7406\u5916\u3067DOM\u3092\u76f4\u63a5\u64cd\u4f5c\u3057\u3066\u3044\u308b\n    document.body.style.backgroundColor = isDark ? '#333' : '#fff';\n    document.body.style.color = isDark ? '#fff' : '#333';\n  }, [isDark]);\n\n  return (\n    &lt;button onClick={() =&gt; setIsDark(!isDark)}&gt;\n      {isDark ? '\u30e9\u30a4\u30c8\u30e2\u30fc\u30c9' : '\u30c0\u30fc\u30af\u30e2\u30fc\u30c9'}\u306b\u5207\u308a\u66ff\u3048\n    &lt;\/button&gt;\n  );\n}\n\n\/\/ \u2705 \u30af\u30e9\u30b9\u540d\u3092state\u3067\u7ba1\u7406\u3057\u3066\u5ba3\u8a00\u7684\u306b\u66f8\u304f\nfunction GoodThemeToggle() {\n  const [isDark, setIsDark] = useState(false);\n\n  return (\n    \/\/ className \u3092 state \u304b\u3089\u5c0e\u51fa\u3059\u308b\u306e\u304c\u5ba3\u8a00\u7684\n    &lt;div className={isDark ? 'theme-dark' : 'theme-light'}&gt;\n      &lt;button onClick={() =&gt; setIsDark(!isDark)}&gt;\n        {isDark ? '\u30e9\u30a4\u30c8\u30e2\u30fc\u30c9' : '\u30c0\u30fc\u30af\u30e2\u30fc\u30c9'}\u306b\u5207\u308a\u66ff\u3048\n      &lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u30d1\u30bf\u30fc\u30f33\uff1adocument.querySelector \u3067\u8981\u7d20\u3092\u53d6\u5f97\u30fb\u5909\u66f4\u3059\u308b<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u274c React \u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5185\u3067 document.querySelector \u3092\u4f7f\u3046\uff08\u547d\u4ee4\u7684\uff09\nfunction BadModal() {\n  const openModal = () => {\n    \/\/ React\u306e\u5916\u304b\u3089DOM\u3092\u64cd\u4f5c\u3057\u3066\u3044\u308b\n    const modal = document.querySelector('#modal');\n    if (modal) modal.style.display = 'block';\n  };\n\n  return (\n    &lt;div&gt;\n      &lt;div id=\"modal\" style={{ display: 'none' }}&gt;\u30e2\u30fc\u30c0\u30eb\u306e\u4e2d\u8eab&lt;\/div&gt;\n      &lt;button onClick={openModal}&gt;\u958b\u304f&lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n}\n\n\/\/ \u2705 isOpen \u3092 state \u3067\u7ba1\u7406\u3057\u3066\u5ba3\u8a00\u7684\u306b\u66f8\u304f\nimport { useState } from 'react';\n\nfunction GoodModal() {\n  const [isOpen, setIsOpen] = useState(false);\n\n  return (\n    &lt;div&gt;\n      {isOpen &amp;&amp; &lt;div&gt;\u30e2\u30fc\u30c0\u30eb\u306e\u4e2d\u8eab&lt;\/div&gt;}\n      &lt;button onClick={() =&gt; setIsOpen(true)}&gt;\u958b\u304f&lt;\/button&gt;\n      {isOpen &amp;&amp; (\n        &lt;button onClick={() =&gt; setIsOpen(false)}&gt;\u9589\u3058\u308b&lt;\/button&gt;\n      )}\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u547d\u4ee4\u7684\u306a\u30b3\u30fc\u30c9\u304c\u9069\u5207\u306a\u30b1\u30fc\u30b9<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\u3010useRef + DOM\u76f4\u63a5\u64cd\u4f5c\u304c\u9069\u5207\u306a\u30b1\u30fc\u30b9\u3011\n\n\u2705 \u30d5\u30a9\u30fc\u30ab\u30b9\u306e\u5236\u5fa1\n\u2192 input.focus() \u306f React \u3067\u306f\u5ba3\u8a00\u7684\u306b\u8868\u73fe\u3057\u306b\u304f\u3044\n\n\u2705 \u30b9\u30af\u30ed\u30fc\u30eb\u4f4d\u7f6e\u306e\u5236\u5fa1\n\u2192 element.scrollIntoView() \u306a\u3069\n\n\u2705 \u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u306eDOM\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u306e\u7d71\u5408\n\u2192 Chart.js\u30fbGoogle Maps \u306a\u3069 React \u3092\u4ecb\u3055\u306a\u3044\u30e9\u30a4\u30d6\u30e9\u30ea\n\n\u2705 \u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\u306e\u7d30\u304b\u306a\u5236\u5fa1\n\u2192 CSS \u3067\u306f\u5bfe\u5fdc\u3067\u304d\u306a\u3044\u8907\u96d1\u306a\u30a2\u30cb\u30e1\u30fc\u30b7\u30e7\u30f3\n\n\u2192 \u3053\u308c\u3089\u306f\u300c\u4f8b\u5916\u7684\u306b\u547d\u4ee4\u7684\u306a\u64cd\u4f5c\u304c\u5fc5\u8981\u306a\u30b1\u30fc\u30b9\u300d\u3068\u3057\u3066\u8a8d\u8b58\u3057\u3066\u304a\u304f<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u5ba3\u8a00\u7684UI\u306e\u30e1\u30ea\u30c3\u30c8\u30fb\u30c7\u30e1\u30ea\u30c3\u30c8<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img decoding=\"async\" src=\"img\/declarative_ui_merits.png\" alt=\"\u5ba3\u8a00\u7684UI\u306e\u30e1\u30ea\u30c3\u30c8\u3068\u30c7\u30e1\u30ea\u30c3\u30c8\u306e\u6bd4\u8f03\u56f3\" class=\"wp-image-12393\"\/><\/figure>\n<\/div>\n\n<table>\n  <thead>\n    <tr><th>\u30e1\u30ea\u30c3\u30c8<\/th><th>\u5185\u5bb9<\/th><th>\u5177\u4f53\u4f8b<\/th><\/tr>\n  <\/thead>\n  <tbody>\n    <tr><td>\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u304c\u9ad8\u3044<\/td><td>\u72b6\u614b\u3092\u898b\u308c\u3070UI\u306e\u8868\u793a\u304c\u4e88\u6e2c\u3067\u304d\u308b<\/td><td><code>{isLoggedIn ? '...' : '...'}<\/code> \u3067\u30ed\u30b0\u30a4\u30f3\u72b6\u614b\u304c\u4e00\u76ee\u3067\u308f\u304b\u308b<\/td><\/tr>\n    <tr><td>\u30d0\u30b0\u304c\u6e1b\u308b<\/td><td>DOM\u306e\u66f4\u65b0\u3092\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u4efb\u305b\u308b\u305f\u3081\u300c\u66f4\u65b0\u3057\u5fd8\u308c\u300d\u304c\u8d77\u304d\u306a\u3044<\/td><td>10\u500b\u306e\u72b6\u614b\u304c\u5909\u308f\u3063\u3066\u3082React\u304c\u5168\u90e8\u5bfe\u5fdc\u3059\u308bDOM\u3092\u81ea\u52d5\u66f4\u65b0\u3059\u308b<\/td><\/tr>\n    <tr><td>\u30c6\u30b9\u30c8\u304c\u66f8\u304d\u3084\u3059\u3044<\/td><td>\u300cstate \u2192 UI\u300d\u306e\u5909\u63db\u30ed\u30b8\u30c3\u30af\u306e\u307f\u30c6\u30b9\u30c8\u3059\u308c\u3070\u3088\u304f\u3001DOM\u64cd\u4f5c\u30c6\u30b9\u30c8\u304c\u4e0d\u8981<\/td><td><code>render(&lt;LoginMessage isLoggedIn={true} \/&gt;)<\/code> \u3067\u8868\u793a\u3092\u691c\u8a3c\u3067\u304d\u308b<\/td><\/tr>\n    <tr><td>\u72b6\u614b\u7ba1\u7406\u304c\u30b7\u30f3\u30d7\u30eb<\/td><td>UI\u306e\u72b6\u614b\u3092\u3059\u3079\u3066state\u3067\u4e00\u5143\u7ba1\u7406\u3067\u304d\u308b<\/td><td>\u30d5\u30a9\u30fc\u30e0\u306e\u5165\u529b\u5024\u30fb\u30a8\u30e9\u30fc\u30fb\u30ed\u30fc\u30c7\u30a3\u30f3\u30b0\u72b6\u614b\u3092state\u3067\u7ba1\u7406<\/td><\/tr>\n    <tr><td>\u518d\u5229\u7528\u30fb\u4fdd\u5b88\u3057\u3084\u3059\u3044<\/td><td>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u5358\u4f4d\u3067\u300c\u72b6\u614b\u3068UI\u300d\u304c\u30bb\u30c3\u30c8<\/td><td>Button\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u3069\u3053\u3067\u3082\u518d\u5229\u7528\u3067\u304d\u308b<\/td><\/tr>\n  <\/tbody>\n<\/table>\n\n\n<pre class=\"wp-block-code\"><code>\u3010\u5ba3\u8a00\u7684UI\u306e\u30c7\u30e1\u30ea\u30c3\u30c8\u3011\n\n\u274c \u5b66\u7fd2\u30b3\u30b9\u30c8\u304c\u9ad8\u3044\n\u2192 \u300c\u72b6\u614b\u3092\u5909\u3048\u305f\u3089UI\u304c\u5909\u308f\u308b\u300d\u3068\u3044\u3046\u601d\u8003\u30e2\u30c7\u30eb\u306b\u6163\u308c\u308b\u307e\u3067\u6642\u9593\u304c\u304b\u304b\u308b\n\u2192 Vanilla JS \u3067\u80b2\u3063\u305f\u958b\u767a\u8005\u306f\u6700\u521d\u306b\u6238\u60d1\u3044\u3084\u3059\u3044\n\n\u274c \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316\u304c\u96e3\u3057\u3044\u5834\u5408\u304c\u3042\u308b\n\u2192 \u4e0d\u8981\u306a\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u304c\u8d77\u304d\u3084\u3059\u3044\n\u2192 React.memo \/ useMemo \/ useCallback \u3067\u306e\u6700\u9069\u5316\u304c\u5fc5\u8981\u306b\u306a\u308b\n\n\u274c \u7d30\u304b\u306aDOM\u5236\u5fa1\u304c\u5fc5\u8981\u306a\u3068\u304d\u306b\u56de\u308a\u304f\u3069\u304f\u306a\u308b\n\u2192 \u30d5\u30a9\u30fc\u30ab\u30b9\u5236\u5fa1\u30fb\u30b9\u30af\u30ed\u30fc\u30eb\u30fb\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30e9\u30a4\u30d6\u30e9\u30ea\u306a\u3069\n\u2192 useRef \u3092\u4f7f\u3063\u305f\u547d\u4ee4\u7684\u30b3\u30fc\u30c9\u3092\u300c\u4f8b\u5916\u3068\u3057\u3066\u300d\u66f8\u304f\u5fc5\u8981\u304c\u3042\u308b<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">TODO\u30ea\u30b9\u30c8\u3067\u5b66\u3076\uff1aVanilla JS vs React \u306e\u5b9f\u88c5\u6bd4\u8f03<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Vanilla JS\uff08\u547d\u4ee4\u7684\uff09\uff1aTODO\u30ea\u30b9\u30c8<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!-- Vanilla JS \u306b\u3088\u308b\u547d\u4ee4\u7684TODO\u30ea\u30b9\u30c8 --&gt;\n&lt;input id=\"todo-input\" placeholder=\"TODO\u3092\u5165\u529b\"&gt;\n&lt;button id=\"add-btn\"&gt;\u8ffd\u52a0&lt;\/button&gt;\n&lt;ul id=\"todo-list\"&gt;&lt;\/ul&gt;\n\n&lt;script&gt;\n  const todos = [];\n  const input = document.getElementById('todo-input');\n  const btn = document.getElementById('add-btn');\n  const list = document.getElementById('todo-list');\n\n  btn.addEventListener('click', () => {\n    if (!input.value.trim()) return;\n    const todo = { text: input.value, done: false };\n    todos.push(todo);\n    input.value = '';\n\n    \/\/ DOM\u3092\u624b\u52d5\u3067\u751f\u6210\u30fb\u8ffd\u52a0\u3059\u308b\uff08\u547d\u4ee4\u7684\uff09\n    const li = document.createElement('li');\n    li.textContent = todo.text;\n\n    li.addEventListener('click', () => {\n      todo.done = !todo.done;\n      li.style.textDecoration = todo.done ? 'line-through' : 'none';\n    });\n\n    const deleteBtn = document.createElement('button');\n    deleteBtn.textContent = '\u524a\u9664';\n    deleteBtn.addEventListener('click', (e) => {\n      e.stopPropagation();\n      todos.splice(todos.indexOf(todo), 1);\n      list.removeChild(li); \/\/ DOM\u3092\u624b\u52d5\u3067\u524a\u9664\u3059\u308b\uff08\u547d\u4ee4\u7684\uff09\n    });\n\n    li.appendChild(deleteBtn);\n    list.appendChild(li);\n  });\n&lt;\/script&gt;<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">React\uff08\u5ba3\u8a00\u7684\uff09\uff1aTODO\u30ea\u30b9\u30c8<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ React \u306b\u3088\u308b\u5ba3\u8a00\u7684UI\u306eTODO\u30ea\u30b9\u30c8\nimport { useState } from 'react';\n\nfunction TodoApp() {\n  const [todos, setTodos] = useState([]);\n  const [input, setInput] = useState('');\n\n  const addTodo = () => {\n    if (!input.trim()) return;\n    \/\/ todos\uff08state\uff09\u3092\u66f4\u65b0\u3059\u308b\u3060\u3051 \u2192 React \u304c\u81ea\u52d5\u3067UI\u3092\u66f4\u65b0\u3059\u308b\n    setTodos([...todos, { id: Date.now(), text: input, done: false }]);\n    setInput('');\n  };\n\n  const toggleTodo = (id) => {\n    setTodos(todos.map(todo =>\n      todo.id === id ? { ...todo, done: !todo.done } : todo\n    ));\n  };\n\n  const deleteTodo = (id) => {\n    setTodos(todos.filter(todo => todo.id !== id));\n  };\n\n  \/\/ UI\u306e\u3042\u308b\u3079\u304d\u59ff\u3092\u5ba3\u8a00\u3059\u308b\u3060\u3051\u3002DOM\u64cd\u4f5c\u306f\u4e00\u5207\u66f8\u304b\u306a\u3044\n  return (\n    &lt;div&gt;\n      &lt;input\n        value={input}\n        onChange={(e) =&gt; setInput(e.target.value)}\n        placeholder=\"TODO\u3092\u5165\u529b\"\n      \/&gt;\n      &lt;button onClick={addTodo}&gt;\u8ffd\u52a0&lt;\/button&gt;\n      &lt;ul&gt;\n        {todos.map(todo =&gt; (\n          &lt;li key={todo.id} style={{ textDecoration: todo.done ? 'line-through' : 'none' }}&gt;\n            &lt;span onClick={() =&gt; toggleTodo(todo.id)}&gt;{todo.text}&lt;\/span&gt;\n            &lt;button onClick={() =&gt; deleteTodo(todo.id)}&gt;\u524a\u9664&lt;\/button&gt;\n          &lt;\/li&gt;\n        ))}\n      &lt;\/ul&gt;\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>\u3010TODO\u30ea\u30b9\u30c8\u5b9f\u88c5\u306e\u6bd4\u8f03\u307e\u3068\u3081\u3011\n\nVanilla JS\uff08\u547d\u4ee4\u7684\uff09        React\uff08\u5ba3\u8a00\u7684\uff09\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\nDOM \u3092\u624b\u52d5\u3067 createElement  \u2192 JSX\u3067\u5ba3\u8a00\u3059\u308b\u3060\u3051\nDOM \u3092\u624b\u52d5\u3067 appendChild    \u2192 React\u304c\u81ea\u52d5\u633f\u5165\nDOM \u3092\u624b\u52d5\u3067 removeChild    \u2192 state \u304b\u3089\u9664\u5916\u3059\u308b\u3060\u3051\nstyle \u3092\u624b\u52d5\u3067\u66f8\u304d\u63db\u3048\u308b    \u2192 state \u304b\u3089 style \u3092\u5c0e\u51fa\n\u5909\u66f4\u306e\u305f\u3073\u306b\u518d\u63cf\u753b\u30ed\u30b8\u30c3\u30af  \u2192 setTodos \u3059\u308b\u3060\u3051\n\n\u2192 \u300c\u72b6\u614b\u3092\u66f4\u65b0\u3059\u308c\u3070\u3001UI\u306f\u81ea\u52d5\u3067\u3064\u3044\u3066\u304f\u308b\u300d\u306e\u304c\u5ba3\u8a00\u7684UI\u306e\u672c\u8cea<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u3088\u304f\u3042\u308b\u8cea\u554f\uff08FAQ\uff09<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Vanilla JS\u3092\u30de\u30b9\u30bf\u30fc\u3057\u3066\u304b\u3089React\u3092\u5b66\u3076\u3079\u304d\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">JavaScript\u306e\u57fa\u790e\u306fReact\u3092\u5b66\u3076\u524d\u306b\u3057\u3063\u304b\u308a\u7406\u89e3\u3057\u3066\u304a\u304f\u3053\u3068\u3092\u5f37\u304f\u63a8\u5968\u3057\u307e\u3059\u3002\u5909\u6570\u30fb\u95a2\u6570\u30fb\u914d\u5217\u64cd\u4f5c\uff08map\u30fbfilter\u30fbspread\uff09\u30fb\u975e\u540c\u671f\u51e6\u7406\uff08Promise\u30fbasync\/await\uff09\u3092\u7406\u89e3\u3057\u305f\u4e0a\u3067React\u3092\u5b66\u3076\u3068\u3001\u300c\u306a\u305c\u3053\u3046\u3044\u3046\u66f8\u304d\u65b9\u3092\u3059\u308b\u306e\u304b\u300d\u304c\u8151\u306b\u843d\u3061\u307e\u3059\u3002\u7279\u306b<code>map()<\/code>\u30fb<code>filter()<\/code>\u30fb\u30b9\u30d7\u30ec\u30c3\u30c9\u6f14\u7b97\u5b50\u306fReact\u306e\u30b3\u30fc\u30c9\u3067\u983b\u7e41\u306b\u767b\u5834\u3059\u308b\u305f\u3081\u5fc5\u9808\u306e\u524d\u63d0\u77e5\u8b58\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">useEffect \u306e\u4e2d\u3067DOM\u3092\u64cd\u4f5c\u3057\u3066\u306f\u3044\u3051\u307e\u305b\u3093\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u7d76\u5bfeNG\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u304c\u3001state\u3067\u7ba1\u7406\u3067\u304d\u308b\u5834\u5408\u306fuseEffect\uff0bDOM\u76f4\u63a5\u64cd\u4f5c\u3092\u907f\u3051\u308b\u306e\u304c\u539f\u5247\u3067\u3059\u3002\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3\u30e9\u30a4\u30d6\u30e9\u30ea\u306e\u521d\u671f\u5316\uff08Google Maps\u30fbChart.js\u306a\u3069\uff09\u3084\u30d5\u30a9\u30fc\u30ab\u30b9\u5236\u5fa1\u30fb\u30b9\u30af\u30ed\u30fc\u30eb\u306a\u3069\u300c\u672c\u8cea\u7684\u306bDOM\u306e\u64cd\u4f5c\u304c\u5fc5\u8981\u306a\u30b1\u30fc\u30b9\u300d\u306f\u4f8b\u5916\u3068\u3057\u3066\u8a31\u5bb9\u3055\u308c\u307e\u3059\u3002\u5224\u65ad\u306e\u76ee\u5b89\u306f\u300c\u3053\u308c\u306fstate\u3067\u8868\u73fe\u3067\u304d\u308b\u304b\uff1f\u300d\u3092\u81ea\u554f\u3059\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Vue\u3084Svelte\u3082\u300c\u5ba3\u8a00\u7684UI\u300d\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u306f\u3044\u3001Vue\u30fbSvelte\u30fbAngular\u306a\u3069\u3082\u5ba3\u8a00\u7684UI\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3067\u3059\u3002\u3044\u305a\u308c\u3082\u300c\u72b6\u614b\u3092\u5ba3\u8a00\u3057\u305f\u3089\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u304cDOM\u3092\u66f4\u65b0\u3059\u308b\u300d\u3068\u3044\u3046\u30e2\u30c7\u30eb\u3092\u63a1\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u5ba3\u8a00\u7684UI\u306e\u6982\u5ff5\u306fReact\u56fa\u6709\u3067\u306f\u306a\u304f\u3001\u30e2\u30c0\u30f3\u30d5\u30ed\u30f3\u30c8\u30a8\u30f3\u30c9\u5168\u4f53\u306b\u5171\u901a\u3059\u308b\u8a2d\u8a08\u601d\u60f3\u3067\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5ba3\u8a00\u7684UI\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u60aa\u3044\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308c\u3070\u3001\u5ba3\u8a00\u7684UI\u304c\u547d\u4ee4\u7684UI\u3088\u308a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3067\u52a3\u308b\u3053\u3068\u306f\u307b\u307c\u3042\u308a\u307e\u305b\u3093\u3002React\u306f<strong>\u4eee\u60f3DOM\uff08Virtual DOM\uff09<\/strong>\u3092\u4f7f\u3044\u3001\u5909\u66f4\u304c\u3042\u3063\u305f\u7b87\u6240\u3060\u3051\u52b9\u7387\u7684\u306bDOM\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u4e0d\u8981\u306a\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u304c\u591a\u3044\u5834\u5408\u306f<code>React.memo<\/code>\u30fb<code>useMemo<\/code>\u30fb<code>useCallback<\/code>\u3067\u306e\u6700\u9069\u5316\u304c\u5fc5\u8981\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">React\u3092\u4f7f\u3063\u3066\u3044\u308b\u306e\u306b\u30b3\u30fc\u30c9\u304c\u8907\u96d1\u306b\u306a\u3063\u3066\u304d\u307e\u3057\u305f\u3002\u306a\u305c\u3067\u3059\u304b\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u3088\u304f\u3042\u308b\u30b1\u30fc\u30b9\u3067\u3059\u3002\u30b3\u30fc\u30c9\u304c\u8907\u96d1\u306b\u306a\u308b\u4e3b\u306a\u539f\u56e0\u3068\u3057\u3066\u3001(1) state\u3092\u8907\u6570\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u5206\u6563\u3055\u305b\u3066\u3044\u308b\u3001(2) useEffect\u306e\u4f9d\u5b58\u914d\u5217\u304c\u8907\u96d1\u306b\u306a\u3063\u3066\u3044\u308b\u3001(3) 1\u3064\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u591a\u304f\u306e\u8cac\u4efb\u3092\u6301\u3061\u3059\u304e\u3066\u3044\u308b\u3001\u306e3\u70b9\u304c\u6319\u3052\u3089\u308c\u307e\u3059\u3002<strong>\u300c1\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c81\u8cac\u4efb\u300d\u3068\u300cstate\u30921\u3064\u4e0a\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u7ba1\u7406\u3059\u308bstate lifting\u300d<\/strong>\u3092\u610f\u8b58\u3059\u308b\u3068\u6574\u7406\u3057\u3084\u3059\u304f\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-14.48.08.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p class=\"balloon balloon-left\"><strong>\u306a\u3093\u3068\u306a\u304f\u308f\u304b\u3063\u3066\u304d\u305f\u3093\u3067\u3059\u304c\u3001React\u3092\u4f7f\u3048\u3070Vanilla JS\u306f\u899a\u3048\u306a\u304f\u3066\u3044\u3044\u3093\u3058\u3083\u306a\u3044\u3067\u3059\u304b\uff1f<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-right\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.11.23.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u30da\u30f3\u535a\u58eb<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p class=\"balloon balloon-right\"><strong>\u305d\u308c\u306f\u5927\u304d\u306a\u8aa4\u89e3\u3058\u3083\u305e\uff01React\u306fJavaScript\u306e\u4e0a\u306b\u6210\u308a\u7acb\u3063\u3066\u3044\u308b\u304b\u3089\u3001JavaScript\u304c\u5f31\u3044\u3068React\u3067\u3064\u307e\u305a\u304d\u7d9a\u3051\u308b\u3053\u3068\u306b\u306a\u308b\u3093\u3058\u3083\u3002map\u30fbfilter\u30fbasync\/await\u3068\u3044\u3063\u305fJS\u306e\u57fa\u790e\u304c\u3057\u3063\u304b\u308a\u3057\u3066\u3044\u3066\u3053\u305d\u3001\u5ba3\u8a00\u7684UI\u306e\u6069\u6075\u3092\u6700\u5927\u9650\u306b\u53d7\u3051\u3089\u308c\u308b\u3093\u3058\u3083\u3002WithCode\u3067\u57fa\u790e\u3092\u3057\u3063\u304b\u308a\u56fa\u3081\u305f\u4e0a\u3067React\u306b\u9032\u3080\u306e\u304c\u6700\u77ed\u30eb\u30fc\u30c8\u3058\u3083\u305e\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n<div class=\"swell-block-balloon\"><div class=\"c-balloon -bln-left\" data-col=\"gray\"><div class=\"c-balloon__icon -square\"><img decoding=\"async\" loading=\"lazy\" src=\"https:\/\/withcode.tech\/media\/wp-content\/uploads\/2025\/06\/\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8-2025-06-15-15.06.05.jpg\" alt=\"\" class=\"c-balloon__iconImg\" width=\"80px\" height=\"80px\"><span class=\"c-balloon__iconName\">\u751f\u5f92<\/span><\/div><div class=\"c-balloon__body -speaking -border-none\"><div class=\"c-balloon__text\">\n<p class=\"balloon balloon-left\"><strong>\u306a\u308b\u307b\u3069\uff01\u300c\u5ba3\u8a00\u7684UI\u306fDOM\u306e\u66f4\u65b0\u3092\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u306b\u4efb\u305b\u308b\u300d\u3068\u3044\u3046\u672c\u8cea\u304c\u3084\u3063\u3068\u3064\u304b\u3081\u307e\u3057\u305f\u3002\u307e\u305aJS\u306e\u57fa\u790e\u3092\u56fa\u3081\u3066\u304b\u3089React\u306b\u9032\u307f\u307e\u3059\uff01<\/strong><\/p>\n<span class=\"c-balloon__shapes\"><span class=\"c-balloon__before\"><\/span><span class=\"c-balloon__after\"><\/span><\/span><\/div><\/div><\/div><\/div>\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">\u307e\u3068\u3081<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n  <li><strong>\u672c\u8cea\u7684\u306a\u9055\u3044<\/strong>\uff1a\u5ba3\u8a00\u7684UI\u306f\u300c\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u300d\u304cDOM\u3092\u66f4\u65b0\u3057\u3001\u547d\u4ee4\u7684UI\u306f\u300c\u958b\u767a\u8005\u300d\u304cDOM\u3092\u66f4\u65b0\u3059\u308b\u3002<\/li>\n  <li><strong>\u3088\u304f\u3042\u308b\u8aa4\u89e3<\/strong>\uff1a\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u3082\u3001DOM\u64cd\u4f5c\u306e\u65b9\u6cd5\u3092\u958b\u767a\u8005\u304c\u66f8\u3044\u3066\u3044\u308c\u3070\u547d\u4ee4\u7684UI\u3002\u5224\u65ad\u57fa\u6e96\u306f\u300cDOM\u66f4\u65b0\u306e\u8cac\u4efb\u304c\u3069\u3053\u306b\u3042\u308b\u304b\u300d\u3002<\/li>\n  <li><strong>\u547d\u4ee4\u7684\u306b\u306a\u3063\u3066\u3057\u307e\u3046\u30d1\u30bf\u30fc\u30f3<\/strong>\uff1auseRef\u3067DOM\u3092\u76f4\u63a5\u66f8\u304d\u63db\u3048\u308b\u30fbuseEffect\u5185\u3067DOM\u64cd\u4f5c\u30fbdocument.querySelector\u3092\u4f7f\u3046\u306e3\u3064\u3092\u8981\u6ce8\u610f\u3002<\/li>\n  <li><strong>\u547d\u4ee4\u7684\u304c\u9069\u5207\u306a\u30b1\u30fc\u30b9<\/strong>\uff1a\u30d5\u30a9\u30fc\u30ab\u30b9\u5236\u5fa1\u30fb\u30b9\u30af\u30ed\u30fc\u30eb\u30fb\u30b5\u30fc\u30c9\u30d1\u30fc\u30c6\u30a3DOM\u30e9\u30a4\u30d6\u30e9\u30ea\u3068\u306e\u7d71\u5408\u306f\u4f8b\u5916\u3068\u3057\u3066\u8a31\u5bb9\u3055\u308c\u308b\u3002<\/li>\n  <li><strong>\u30e1\u30ea\u30c3\u30c8<\/strong>\uff1a\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u5411\u4e0a\u30fb\u30d0\u30b0\u524a\u6e1b\u30fb\u30c6\u30b9\u30c8\u306e\u3057\u3084\u3059\u3055\u30fb\u72b6\u614b\u7ba1\u7406\u306e\u30b7\u30f3\u30d7\u30eb\u5316\u30fb\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u5229\u7528\u6027\u3002<\/li>\n  <li><strong>\u524d\u63d0\u77e5\u8b58<\/strong>\uff1amap\u30fbfilter\u30fb\u30b9\u30d7\u30ec\u30c3\u30c9\u6f14\u7b97\u5b50\u30fbasync\/await\u306a\u3069JavaScript\u306e\u57fa\u790e\u304c\u5ba3\u8a00\u7684UI\u3092\u6d3b\u304b\u3059\u305f\u3081\u306e\u571f\u53f0\u306b\u306a\u308b\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><span class=\"swl-marker mark_yellow\">React\u5ba3\u8a00\u7684UI\u306e\u672c\u8cea\u306f\u300c\u72b6\u614b\u3092\u5909\u3048\u308b\u3060\u3051\u3067UI\u304c\u8ffd\u968f\u3059\u308b\u300d\u3068\u3044\u3046\u8a2d\u8a08\u30e2\u30c7\u30eb\u3067\u3042\u308a\u3001JavaScript\u306e\u57fa\u790e\u3068\u30bb\u30c3\u30c8\u3067\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u521d\u3081\u3066\u305d\u306e\u6069\u6075\u3092\u6700\u5927\u9650\u306b\u53d7\u3051\u3089\u308c\u307e\u3059<\/span><\/strong>\u3002<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">WithCode\u3092\u4f53\u9a13\u3067\u304d\u308b\u521d\u7d1a\u30b3\u30fc\u30b9\u516c\u958b\u4e2d\uff01<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">\u521d\u7d1a\u30b3\u30fc\u30b9\uff08\u00a549,800\uff09\u304c\u5b8c\u5168\u7121\u6599\u306b\uff01<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n  <li><strong>\u671f\u9593\uff1a<\/strong>1\u9031\u9593<\/li>\n  <li><strong>\u5b66\u7fd2\u5185\u5bb9\uff1a<\/strong>\u30ed\u30fc\u30c9\u30de\u30c3\u30d7\uff0f\u57fa\u790e\u77e5\u8b58\uff0f\u74b0\u5883\u69cb\u7bc9\uff0fHTML\uff0fCSS\uff0fJavaScript <strong><span class=\"swl-marker mark_yellow\">\u2192 \u5ba3\u8a00\u7684UI\u3092\u7406\u89e3\u3057\u3066React\u3092\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306e\u5fc5\u9808\u306eJavaScript\u57fa\u790e\u3092\u3001\u5b9f\u8df5\u7684\u306a\u30ab\u30ea\u30ad\u30e5\u30e9\u30e0\u3067\u4f53\u7cfb\u7684\u306b\u7fd2\u5f97\u3067\u304d\u307e\u3059<\/span><\/strong><\/li>\n<\/ul>\n\n\n\n<p 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