{"id":60,"date":"2022-02-10T01:28:28","date_gmt":"2022-02-09T16:28:28","guid":{"rendered":"https:\/\/engineering.webstudio168.jp\/?p=60"},"modified":"2022-03-18T11:31:28","modified_gmt":"2022-03-18T02:31:28","slug":"react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab","status":"publish","type":"post","link":"https:\/\/engineering.webstudio168.jp\/blog\/react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab\/","title":{"rendered":"React\u3001React Native\u306b\u304a\u3051\u308b\u30d5\u30c3\u30af\u3068\u306f\u4f55\u304b\u3010\u57fa\u672c\u3068\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3011"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab\/#React_Hooks%EF%BC%88%E3%83%95%E3%83%83%E3%82%AF%EF%BC%89%E3%81%A8%E3%81%AF%E4%BD%95%E3%81%8B\" >React Hooks\uff08\u30d5\u30c3\u30af\uff09\u3068\u306f\u4f55\u304b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab\/#React_Hooks%E3%82%92%E5%88%A9%E7%94%A8%E3%81%99%E3%82%8B%E3%81%A8%E4%BD%95%E3%81%8C%E4%BE%BF%E5%88%A9%E3%81%AA%E3%81%AE%E3%81%8B%E3%80%82\" >React Hooks\u3092\u5229\u7528\u3059\u308b\u3068\u4f55\u304c\u4fbf\u5229\u306a\u306e\u304b\u3002<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab\/#%E3%82%B9%E3%83%86%E3%83%BC%E3%82%BF%E3%82%B9%E3%83%95%E3%83%83%E3%82%AF%E7%B7%A8\" >\u30b9\u30c6\u30fc\u30bf\u30b9\u30d5\u30c3\u30af\u7de8<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab\/#%E5%89%AF%E4%BD%9C%E7%94%A8%E3%83%95%E3%83%83%E3%82%AF%E7%B7%A8\" >\u526f\u4f5c\u7528\u30d5\u30c3\u30af\u7de8<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab\/#%E5%9F%BA%E6%9C%AC%E3%81%A8%E3%81%AA%E3%82%8B%E5%9E%8B\" >\u57fa\u672c\u3068\u306a\u308b\u578b<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab\/#%E3%82%B9%E3%83%86%E3%83%BC%E3%83%88%E3%83%95%E3%83%83%E3%82%AF%EF%BC%88state%E3%83%95%E3%83%83%E3%82%AF%EF%BC%89%E3%81%AE%E3%82%B9%E3%83%8B%E3%83%9A%E3%83%83%E3%83%88\" >\u30b9\u30c6\u30fc\u30c8\u30d5\u30c3\u30af\uff08state\u30d5\u30c3\u30af\uff09\u306e\u30b9\u30cb\u30da\u30c3\u30c8<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab\/#%E5%89%AF%E4%BD%9C%E7%94%A8%E3%83%95%E3%83%83%E3%82%AF%EF%BC%88effect%E3%83%95%E3%83%83%E3%82%AF%EF%BC%89%E3%81%AE%E3%82%B9%E3%83%8B%E3%83%9A%E3%83%83%E3%83%88\" >\u526f\u4f5c\u7528\u30d5\u30c3\u30af\uff08effect\u30d5\u30c3\u30af\uff09\u306e\u30b9\u30cb\u30da\u30c3\u30c8<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab\/#%E5%AE%9F%E3%81%AF%E3%81%BE%E3%81%A0%E3%81%82%E3%82%8BReact_Hooks\" >\u5b9f\u306f\u307e\u3060\u3042\u308bReact Hooks<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/engineering.webstudio168.jp\/blog\/react%e3%80%81react-native%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%83%95%e3%83%83%e3%82%af%e3%81%a8%e3%81%af%e4%bd%95%e3%81%8b%e3%80%90%e5%9f%ba%e6%9c%ac%e3%81%a8%e3%82%b5%e3%83%b3%e3%83%97%e3%83%ab\/#%E5%8F%AF%E8%AA%AD%E6%80%A7%E3%81%A8%E3%83%A1%E3%83%B3%E3%83%86%E3%81%AE%E3%81%97%E3%82%84%E3%81%99%E3%81%95%E6%8A%9C%E7%BE%A4%E3%81%AEReact_Hooks\" >\u53ef\u8aad\u6027\u3068\u30e1\u30f3\u30c6\u306e\u3057\u3084\u3059\u3055\u629c\u7fa4\u306eReact Hooks<\/a><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\">React Native\u306b\u89e6\u308c\u308b\u6a5f\u4f1a\u304c\u591a\u304f\u306a\u3063\u3066\u3001\u30d5\u30c3\u30af\uff08\u82f1\u8a9e\uff1ahooks\uff09\u3068\u3044\u3046\u8a00\u8449\u306b\u3076\u3064\u304b\u308a\u307e\u3057\u305f\u3002hook\u3092\u548c\u8a33\u3059\u308b\u3068\u3001\u52d5\u8a5e\u306e\u5834\u5408\u306f\u3001\u91d8\u306b\u304b\u3051\u308b\u3001\u3084\u30db\u30c3\u30af\u3067\u7559\u3081\u308b\u3001\u3072\u3063\u304b\u3051\u308b\u3001\u306a\u3069\u639b\u3051\u308b\u30fb\u7559\u3081\u308b\u3068\u3044\u3046\u610f\u5473\u3067\u3059\u3002\u540d\u8a5e\u3068\u3057\u3066\u4f7f\u3048\u3070\u3001\u304b\u304e\u30fb\u7559\u3081\u91d1\u30fb\u30db\u30c3\u30af\u3067\u3059\u306d\u3002\u305f\u3060\u3001React\u3084React Native\u306b\u304a\u3051\u308b\u3044\u308f\u3086\u308bReact Hooks\u306e\u5834\u5408\u3001\u3061\u3087\u3063\u3068\u3053\u306e\u610f\u5473\u3092\u3044\u3063\u305f\u3093\u5fd8\u308c\u3066\u3057\u307e\u3063\u305f\u65b9\u304c\u3001\u3059\u3093\u306a\u308a\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"react-hooks-\u30d5\u30c3\u30af-\u3068\u306f\u4f55\u304b\"><span class=\"ez-toc-section\" id=\"React_Hooks%EF%BC%88%E3%83%95%E3%83%83%E3%82%AF%EF%BC%89%E3%81%A8%E3%81%AF%E4%BD%95%E3%81%8B\"><\/span>React Hooks\uff08\u30d5\u30c3\u30af\uff09\u3068\u306f\u4f55\u304b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30d5\u30c3\u30af\u306fReact \u30d0\u30fc\u30b8\u30e7\u30f3 16.8.0 \u304b\u3089\u63a1\u7528\u3055\u308c\u305f\u65b0\u6a5f\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<br>state\uff08*1\uff09 \u306a\u3069\u306e React \u306e\u6a5f\u80fd\u3092\u3001\u30af\u30e9\u30b9\uff08class\uff09\u3092\u66f8\u304b\u305a\u306b\u4f7f\u3048\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u308a\u95a2\u6570\u5185\u90e8\u3067\u4f7f\u7528\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<br>\uff08*1 sate\u3068\u805e\u3044\u3066\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3068\u95a2\u9023\u4ed8\u3051\u3089\u308c\u308b\u65b9\u306f\u3055\u3059\u304c\u3060\u3068\u601d\u3044\u307e\u3059\u3002\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u72b6\u614b\u3092\u3064\u304b\u3055\u3069\u308b\u306e\u3067\u307b\u307c\u307b\u307c\u540c\u7fa9\u3060\u3068\u8003\u3048\u3066\u3082\u826f\u3044\u304b\u3082\u3067\u3059\u3002\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">React\u3001React Native\u306b\u304a\u3051\u308bhooks\u306f\u4ee3\u8868\u7684\u306a\uff12\u3064\u306e\u4ed5\u7d44\u307f\u304c\u3042\u308a\u307e\u3059\u3002<br>state\u30d5\u30c3\u30af\uff08\u30b9\u30c6\u30fc\u30c8\u30d5\u30c3\u30af\uff09\u3068effect\u30d5\u30c3\u30af\uff08\u526f\u4f5c\u7528\u30d5\u30c3\u30af\uff09\u3067\u3059\u306d\u3002\u305d\u308c\u305d\u308c\u306b\u3064\u3044\u3066\u306f\u5f8c\u8ff0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u3067\u306f\u3001\u5b9f\u969b\u3069\u3093\u306a\u30b3\u30fc\u30c9\u304c\u30d5\u30c3\u30af\u3092\u4f7f\u3063\u3066\u30bd\u30fc\u30b9\u3092\u7c21\u7565\u5316\u3057\u305f\u308a\u3001\u53ef\u8aad\u6027\u3092\u5411\u4e0a\u3055\u305b\u3089\u308c\u308b\u306e\u304b\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"react-hooks\u3092\u5229\u7528\u3059\u308b\u3068\u4f55\u304c\u4fbf\u5229\u306a\u306e\u304b\"><span class=\"ez-toc-section\" id=\"React_Hooks%E3%82%92%E5%88%A9%E7%94%A8%E3%81%99%E3%82%8B%E3%81%A8%E4%BD%95%E3%81%8C%E4%BE%BF%E5%88%A9%E3%81%AA%E3%81%AE%E3%81%8B%E3%80%82\"><\/span>React Hooks\u3092\u5229\u7528\u3059\u308b\u3068\u4f55\u304c\u4fbf\u5229\u306a\u306e\u304b\u3002<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u30b9\u30c6\u30fc\u30bf\u30b9\u30d5\u30c3\u30af\u7de8\"><span class=\"ez-toc-section\" id=\"%E3%82%B9%E3%83%86%E3%83%BC%E3%82%BF%E3%82%B9%E3%83%95%E3%83%83%E3%82%AF%E7%B7%A8\"><\/span>\u30b9\u30c6\u30fc\u30bf\u30b9\u30d5\u30c3\u30af\u7de8<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">React Hooks\u524d\u3068React Hooks\u5f8c\u3067\u3069\u306e\u3088\u3046\u306b\u7570\u306a\u308b\u306e\u304b\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u6b21\u306e\u30b3\u30fc\u30c9\u306fReact Hooks\u524d\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"state\u30d5\u30c3\u30af\u524d\" data-lang=\"JavaScript\"><code>import React from &#39;react&#39;;\nclass ExComponet extends React.Component {\n  constructor(props) {\n      super(propds);\n      this.state = { feeling: &#39;&#39; };\n      this.handleChange = this.changer.bind(this);\n  };\n  \n  changer(ev) {\n      this.setState({ feeling: ev.target.val });\n  };\n  \n  render() {\n      const { feeling } = this.state\n      return (\n            &lt;div&gt;\n                &lt;input value={feeling} onChange={this.changer} \/&gt;\n                &lt;p&gt;MARO fleels {age} now!&lt;\/p&gt;\n            &lt;\/div&gt;\n      );\n  };\n};<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c11\u3057\u8a71\u304c\u305d\u308c\u307e\u3059\u304c\u3001\u3068\u3042\u308b\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u5e2b\u5320\u304b\u3089\u300cstate\u306f\u72b6\u614b\u3084\u53ef\u5909\u306e\u3082\u306e\u300d\u3092\u6307\u3057\u3001Props\u306f\u300c\u6027\u8cea\u3084\u4e0d\u5909\u306a\u3082\u306e\u300d\u3068\u3001\u899a\u3048\u308b\u3068\u5206\u304b\u308a\u3084\u3059\u3044\u3068\u6559\u3048\u3066\u3044\u305f\u3060\u304d\u307e\u3057\u305f\u3002state\u306f\u300c\u8179\u6e1b\u3063\u305f\u30fb\u30fb\u30fb\u300d\u3068\u304b\u3001\u72b6\u614b\u3092\u793a\u3057\u3001Props\u306f\u300c\u76ee\u306e\u8272\u3001\u751f\u7269\u5b66\u7684\u306a\u6027\u5225\u300d\u3060\u3063\u305f\u308a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8a71\u304c\u3076\u3063\u3068\u3073\u307e\u3057\u305f\u304c\u3001\u6b21\u306e\u30b3\u30fc\u30c9\u306fReact Hooks\u306b\u3088\u308a\u4e0a\u8a18\u3088\u308a\u53ef\u8aad\u6027\u306e\u826f\u304f\u306a\u3063\u305f\u30b3\u30fc\u30c9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"state\u30d5\u30c3\u30af\u5f8c\" data-lang=\"JavaScript\"><code>import React, { useState } from &#39;react&#39;;\nconst ExComponent: React.FC = () =&gt; {\n    const [feeling, setFeeling] = useState(&#39;&#39;);\n    \n    const changer = (ev) =&gt; {\n        setFeeling(ev.target.value);\n    };\n\n    return (\n        &lt;div&gt;\n            &lt;input value={feeling} onChange={changer} \/&gt;\n            &lt;p&gt;I&#39;m {feeling}&lt;\/p&gt;\n        &lt;\/div&gt;\n    );\n};<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u76ee\u3059\u3079\u304d\u306fconst [feeling, setFeeling] = useState(&#8221;);\u3053\u306e\u90e8\u5206\u3068setFeeling(ev.target.value)\u306e\u90e8\u5206\u306b\u306a\u308a\u307e\u3059\u3002\u4e0a\u4e0b\u3067\u6bd4\u8f03\u3059\u308b\u3068\u30bd\u30fc\u30b9\u306e\u53ef\u8aad\u6027\u304c\u4e00\u6c17\u306b\u5411\u4e0a\u3057\u307e\u3059\u3002\u3082\u3061\u308d\u3093\u6700\u521d\u306e\u30b3\u30fc\u30c9\u3001\u6700\u5f8c\u306e\u30b3\u30fc\u30c9\u3069\u3061\u3089\u3082\u540c\u69d8\u306b\u52d5\u4f5c\u3057\u307e\u3059\u3002\u540c\u3058\u3082\u306e\u306a\u3089\u8aad\u307f\u3084\u3059\u3044\u65b9\u304c\u4fdd\u5b88\u6027\u3082\u9ad8\u307e\u308a\u307e\u3059\u306d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u526f\u4f5c\u7528\u30d5\u30c3\u30af\u7de8\"><span class=\"ez-toc-section\" id=\"%E5%89%AF%E4%BD%9C%E7%94%A8%E3%83%95%E3%83%83%E3%82%AF%E7%B7%A8\"><\/span>\u526f\u4f5c\u7528\u30d5\u30c3\u30af\u7de8<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b9\u30c6\u30fc\u30bf\u30b9\u30d5\u30c3\u30af\u306b\u6bd4\u3079\u308b\u3068\u5206\u304b\u308a\u3084\u3059\u3044\u306e\u3067\u3053\u3061\u3089\u304b\u3089\u7fd2\u5f97\u3059\u308b\u306e\u304c\u304a\u3059\u3059\u3081\u3067\u3059\u3002<br>\u3055\u304d\u307b\u3069\u53ef\u8aad\u6027\u304c\u826f\u304f\u306a\u308a\u307e\u3057\u305f\u3001\u3068\u66f8\u304d\u307e\u3057\u305f\u304c\u3076\u3063\u3061\u3083\u3051\u6570\u884c\u306e\u8a71\u3067\u3044\u307e\u3044\u3061\u8cdb\u540c\u304c\u5f97\u3089\u308c\u306a\u3044\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u4eca\u56de\u306f\u304d\u3063\u3068\u3001\u300c\u78ba\u304b\u306b\u300d\u3068\u601d\u3063\u3066\u3082\u3089\u3048\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002\u6b21\u306e\u30b3\u30fc\u30c9\u3092\u898b\u3066\u304f\u3060\u3055\u3044\u3002\u4e00\u756a\u5206\u304b\u308a\u3084\u3059\u3044\u306e\u3067<a href=\"https:\/\/ja.reactjs.org\/docs\/hooks-effect.html\">React\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>\u304b\u3089\u6301\u3063\u3066\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"https:\/\/ja.reactjs.org\/docs\/hooks-effect.html\" data-lang=\"JavaScript\"><code>class Example extends React.Component {\n  constructor(props) {\n    super(props);\n    this.state = {\n      count: 0\n    };\n  }\n\n  componentDidMount() {\n    document.title = `You clicked ${this.state.count} times`;\n  }\n  componentDidUpdate() {\n    document.title = `You clicked ${this.state.count} times`;\n  }\n\n  render() {\n    return (\n      &lt;div&gt;\n        &lt;p&gt;You clicked {this.state.count} times&lt;\/p&gt;\n        &lt;button onClick={() =&gt; this.setState({ count: this.state.count + 1 })}&gt;\n          Click me\n        &lt;\/button&gt;\n      &lt;\/div&gt;\n    );\n  }\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u7279\u306b\u6ce8\u76ee\u3059\u3079\u304d\u306f\u3001<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>  componentDidMount() {\n    document.title = `You clicked ${this.state.count} times`;\n  }\n  componentDidUpdate() {\n    document.title = `You clicked ${this.state.count} times`;\n  }<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u306e\u90e8\u5206\u3067\u3057\u3087\u3046\u3002componentDidMount()\u3001componentDidUpdate() \u95a2\u6570\u5185\u3067\u5168\u304f\u540c\u3058\u30b3\u30fc\u30c9\u304c2\u56de\u767b\u5834\u3057\u3066\u3057\u307e\u3063\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306f\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3084\u904b\u7528\u3092\u8003\u3048\u308b\u30682\u5ea6\u624b\u9593\u3067\u3059\u3057\u3001\u30df\u30b9\u304c\u767a\u751f\u3057\u3084\u3059\u304f\u306a\u308b\u539f\u56e0\u3068\u3082\u306a\u308a\u5f97\u307e\u3059\u306d\u3002\u305d\u3053\u3067\u3001\u526f\u4f5c\u7528\u30d5\u30c3\u30af\u3092\u7528\u3044\u305f\u30b3\u30fc\u30c9\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"https:\/\/ja.reactjs.org\/docs\/hooks-effect.html\" data-lang=\"JavaScript\"><code>import React, { useState, useEffect } from &#39;react&#39;;\n\nfunction Example() {\n  const [count, setCount] = useState(0);\n\n  useEffect(() =&gt; {\n    document.title = `You clicked ${count} times`;\n  });\n\n  return (\n    &lt;div&gt;\n      &lt;p&gt;You clicked {count} times&lt;\/p&gt;\n      &lt;button onClick={() =&gt; setCount(count + 1)}&gt;\n        Click me\n      &lt;\/button&gt;\n    &lt;\/div&gt;\n  );\n}<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u4eca\u56de\u306e\u6bd4\u8f03\u306f\u3060\u3044\u3076\u53ef\u8aad\u6027\u304c\u5b9f\u611f\u51fa\u6765\u308b\u3068\u601d\u3044\u307e\u3059\u3002\u4f55\u3088\u308a\u7121\u99c4\u306b\u3059\u3089\u601d\u3048\u3066\u3057\u307e\u30462\u304b\u6240\u306e\u8a18\u8ff0\u304c\u4e00\u3064\u306b\u307e\u3068\u3081\u3089\u308c\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u3082\u5927\u5e45\u306b\u4e0a\u304c\u3063\u3066\u3044\u308b\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6ce8\u76ee\u30dd\u30a4\u30f3\u30c8\u306f<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-ts\" data-lang=\"TypeScript\"><code>  useEffect(() =&gt; {\n    document.title = `You clicked ${count} times`;\n  });<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3067\u3057\u3087\u3046\u3002componentDidMount()\u3001componentDidUpdate()\u306e\u95a2\u6570\u3092\u4e00\u3064\u306b\u307e\u3068\u3081\u308b\u3053\u3068\u304c\u51fa\u6765\u3066\u3044\u307e\u3059\u3002\u3054\u5b58\u3058\u306e\u65b9\u3082\u591a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u4ed6\u306b\u3082componentWillUnmount()\u3082\u4f75\u7528\u3059\u308b\u3053\u3068\u304c\u3042\u308b\u306e\u30673\u3064\u307e\u3068\u3081\u3066\u3053\u306e3\u884c\u306b\u51dd\u7e2e\u3059\u308b\u3053\u3068\u304c\u53ef\u80fd\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u57fa\u672c\u3068\u306a\u308b\u578b\"><span class=\"ez-toc-section\" id=\"%E5%9F%BA%E6%9C%AC%E3%81%A8%E3%81%AA%E3%82%8B%E5%9E%8B\"><\/span>\u57fa\u672c\u3068\u306a\u308b\u578b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u30b9\u30c6\u30fc\u30c8\u30d5\u30c3\u30af\u3068\u526f\u4f5c\u7528\u30d5\u30c3\u30af\u3067\u3059\u304c\u3001\u305d\u308c\u305e\u308c\u57fa\u672c\u3068\u306a\u308b\u66f8\u304d\u65b9\uff08\u6587\u6cd5\uff09\u3092\u899a\u3048\u3066\u304a\u3051\u3070\u3055\u307b\u3069\u8e93\u304f\u3053\u3068\u306f\u306a\u3044\u304b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u30b9\u30c6\u30fc\u30c8\u30d5\u30c3\u30af-state\u30d5\u30c3\u30af-\u306e\u30b9\u30cb\u30da\u30c3\u30c8\"><span class=\"ez-toc-section\" id=\"%E3%82%B9%E3%83%86%E3%83%BC%E3%83%88%E3%83%95%E3%83%83%E3%82%AF%EF%BC%88state%E3%83%95%E3%83%83%E3%82%AF%EF%BC%89%E3%81%AE%E3%82%B9%E3%83%8B%E3%83%9A%E3%83%83%E3%83%88\"><\/span>\u30b9\u30c6\u30fc\u30c8\u30d5\u30c3\u30af\uff08state\u30d5\u30c3\u30af\uff09\u306e\u30b9\u30cb\u30da\u30c3\u30c8<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"https:\/\/ja.reactjs.org\/docs\/hooks-effect.html\" data-lang=\"JavaScript\"><code>const [count, setCount] = useState(&#39;banana&#39;);\n\u30fb\n\u30fb\n\u30fb\n&lt;button onClick={() =&gt; this.setState({ count: this.state.count + 1 })}&gt;<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">1\u884c\u76ee\u306euseState()\u306b\u3064\u3044\u3066\u306f\u300c\u201c\u5206\u5272\u4ee3\u5165 (destructuring)\u201d\u300d\u3068\u3044\u3046\u69cb\u6587\u3067\u3001\u4e0b\u8a18\u3068\u540c\u7fa9\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"https:\/\/ja.reactjs.org\/docs\/hooks-effect.html\" data-lang=\"JavaScript\"><code>  var fruitStateVariable = useState(&#39;banana&#39;); \/\/ Returns a pair\n  var fruit = fruitStateVariable[0]; \/\/ First item in a pair\n  var setFruit = fruitStateVariable[1]; \/\/ Second item in a pair<\/code><\/pre><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u304b\u306a\u30fc\u308a\u4fbf\u5229\u3067\u3059\u306d\uff01<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"\u526f\u4f5c\u7528\u30d5\u30c3\u30af-effect\u30d5\u30c3\u30af-\u306e\u30b9\u30cb\u30da\u30c3\u30c8\"><span class=\"ez-toc-section\" id=\"%E5%89%AF%E4%BD%9C%E7%94%A8%E3%83%95%E3%83%83%E3%82%AF%EF%BC%88effect%E3%83%95%E3%83%83%E3%82%AF%EF%BC%89%E3%81%AE%E3%82%B9%E3%83%8B%E3%83%9A%E3%83%83%E3%83%88\"><\/span>\u526f\u4f5c\u7528\u30d5\u30c3\u30af\uff08effect\u30d5\u30c3\u30af\uff09\u306e\u30b9\u30cb\u30da\u30c3\u30c8<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-file=\"https:\/\/ja.reactjs.org\/docs\/hooks-effect.html\" data-lang=\"JavaScript\"><code>  useEffect(() =&gt; {\n    document.title = `You clicked ${count} times`;\n  });<\/code><\/pre><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u5b9f\u306f\u307e\u3060\u3042\u308breact-hooks\"><span class=\"ez-toc-section\" id=\"%E5%AE%9F%E3%81%AF%E3%81%BE%E3%81%A0%E3%81%82%E3%82%8BReact_Hooks\"><\/span>\u5b9f\u306f\u307e\u3060\u3042\u308bReact Hooks<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4eca\u56de\u306f\u4ee3\u8868\u7684\u3067\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u57fa\u5e79\u306b\u5bc6\u63a5\u306b\u95a2\u4fc2\u3057\u304c\u3061\u306a\u3001\u30b9\u30c6\u30fc\u30c8\u30d5\u30c3\u30af\u3068\u526f\u4f5c\u7528\u30d5\u30c3\u30af\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u3066\u307f\u307e\u3057\u305f\u304c\u3001React\u3001React Native\u306b\u306f\u307e\u3060\u307e\u3060React Hooks\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u7d39\u4ecb\u3059\u308b\u3068\u4f55\u6587\u5b57\u306b\u306a\u308b\u304b\u5206\u304b\u3089\u306a\u3044\u306e\u3067\u307e\u305f\u5225\u306e\u6a5f\u4f1a\u306b\uff01\u3088\u304b\u3063\u305f\u3089\u30b5\u30a4\u30c8\u3092\u30d6\u30c3\u30af\u30de\u30fc\u30af\u3057\u3066\u7d9a\u5831\u3092\u304a\u5f85\u3061\u304f\u3060\u3055\u308b\u3068\u3001\u304a\u3058\u3055\u3093\u559c\u3073MAX\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"\u53ef\u8aad\u6027\u3068\u30e1\u30f3\u30c6\u306e\u3057\u3084\u3059\u3055\u629c\u7fa4\u306ereact-hooks\"><span class=\"ez-toc-section\" id=\"%E5%8F%AF%E8%AA%AD%E6%80%A7%E3%81%A8%E3%83%A1%E3%83%B3%E3%83%86%E3%81%AE%E3%81%97%E3%82%84%E3%81%99%E3%81%95%E6%8A%9C%E7%BE%A4%E3%81%AEReact_Hooks\"><\/span>\u53ef\u8aad\u6027\u3068\u30e1\u30f3\u30c6\u306e\u3057\u3084\u3059\u3055\u629c\u7fa4\u306eReact Hooks<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u3001\u3054\u7d39\u4ecb\u3057\u307e\u3057\u305fReact Hooks\u3001React Native 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