{"id":7552,"date":"2022-12-05T22:31:45","date_gmt":"2022-12-05T13:31:45","guid":{"rendered":"https:\/\/kininariantenna.com\/?p=7552"},"modified":"2022-12-05T22:31:45","modified_gmt":"2022-12-05T13:31:45","slug":"react%e3%81%a7%e5%88%9d%e5%9b%9euseeffect%e3%81%8c2%e5%9b%9e%e5%91%bc%e3%81%b0%e3%82%8c%e3%82%8b%e5%8e%9f%e5%9b%a0%e3%81%a8%e5%af%be%e5%87%a6%e6%b3%95%ef%bc%81","status":"publish","type":"post","link":"https:\/\/kininariantenna.com\/?p=7552","title":{"rendered":"React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5\uff01"},"content":{"rendered":"<p>\u3051\u3069\u3001\u305d\u3093\u306a\u4e2d\u3067\u60a9\u3080\u3053\u3068\u306f\u3001<\/p>\n<div class=\"kininarukoto1\">\u30fbReact\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u3066\u3057\u307e\u3046\u304c\u539f\u56e0\u304c\u308f\u304b\u3089\u306a\u3044<br \/>\n\u30fbReact\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u3066\u3057\u307e\u3046\u304c\u3069\u3046\u5bfe\u51e6\u3057\u3066\u3088\u3044\u304b\u308f\u304b\u3089\u306a\u3044<\/div>\n<p>\u3067\u3059\u3088\u306d\u3002<\/p>\n<p>\u4eca\u56de\u306f\u305d\u3093\u306a\u304a\u60a9\u307f\u3092\u89e3\u6c7a\u3059\u308b<\/p>\n<div class=\"rdinfo\">\u30fbReact\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/div>\n<p>\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3059\uff01<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_46 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">\u3082\u304f\u3058<\/p>\n<span class=\"ez-toc-title-toggle\"><\/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:\/\/kininariantenna.com\/?p=7552\/#React%E3%81%A7%E5%88%9D%E5%9B%9EuseEffect%E3%81%8C2%E5%9B%9E%E5%91%BC%E3%81%B0%E3%82%8C%E3%82%8B%E5%8E%9F%E5%9B%A0\" title=\"React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u539f\u56e0\">React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u539f\u56e0<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kininariantenna.com\/?p=7552\/#React%E3%81%A7%E5%88%9D%E5%9B%9EuseEffect%E3%81%8C2%E5%9B%9E%E5%91%BC%E3%81%B0%E3%82%8C%E3%82%8B%E4%BA%8B%E8%B1%A1%E3%82%92%E5%86%8D%E7%8F%BE\" title=\"React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u4e8b\u8c61\u3092\u518d\u73fe\">React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u4e8b\u8c61\u3092\u518d\u73fe<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kininariantenna.com\/?p=7552\/#React%E3%81%A7%E5%88%9D%E5%9B%9EuseEffect%E3%81%8C2%E5%9B%9E%E5%91%BC%E3%81%B0%E3%82%8C%E3%82%8B%E5%95%8F%E9%A1%8C%E3%81%AE%E5%AF%BE%E5%87%A6%E6%B3%95\" title=\"React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u554f\u984c\u306e\u5bfe\u51e6\u6cd5\">React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u554f\u984c\u306e\u5bfe\u51e6\u6cd5<\/a><ul class='ez-toc-list-level-3'><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kininariantenna.com\/?p=7552\/#React18%E3%81%AEStrictMode%E3%82%92%E7%84%A1%E5%8A%B9%E3%81%AB%E3%81%99%E3%82%8B\" title=\"React18\u306eStrictMode\u3092\u7121\u52b9\u306b\u3059\u308b\">React18\u306eStrictMode\u3092\u7121\u52b9\u306b\u3059\u308b<\/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:\/\/kininariantenna.com\/?p=7552\/#%E3%81%95%E3%81%84%E3%81%94%E3%81%AB\" title=\"\u3055\u3044\u3054\u306b\">\u3055\u3044\u3054\u306b<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"React%E3%81%A7%E5%88%9D%E5%9B%9EuseEffect%E3%81%8C2%E5%9B%9E%E5%91%BC%E3%81%B0%E3%82%8C%E3%82%8B%E5%8E%9F%E5%9B%A0\"><\/span>React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u539f\u56e0<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u539f\u56e0\u306f<\/p>\n<p>React18\u304b\u3089\u8ffd\u52a0\u3055\u308c\u305fStrictMode\u306b\u3088\u308b\u3082\u306e\u3068\u3044\u3046\u3053\u3068\u306e\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>\u3053\u306eStrictMode\u3067React\u3092\u5b9f\u884c\u3055\u305b\u305f\u5834\u5408\u306f\u610f\u56f3\u7684\u306b2\u91cd\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u3059\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<p><!--\u5439\u304d\u51fa\u3057\u306f\u3058\u307e\u308a--><\/p>\n<div class=\"fukidashi1\">\n<div class=\"icon\">\n<div class=\"wphg\"><img loading=\"lazy\" src=\"\/wp-content\/uploads\/2021\/07\/taka_kao3.gif\" alt=\"\u30bf\u30ab\u30d2\u30ed\" width=\"110\" height=\"110\" \/><\/div>\n<div class=\"iconfont\">\u30bf\u30ab\u30d2\u30ed<\/div>\n<\/div>\n<div class=\"bubble\">\u691c\u67fb\u306e\u305f\u3081\u306b\u4e8c\u91cd\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3059\u308b\u65b0\u8a2d\u6a5f\u80fd\u306e\u3088\u3046\u3067\u3059\u306d\u3002\u3002<\/div>\n<\/div>\n<p><!--\u5439\u304d\u51fa\u3057\u7d42\u308f\u308a--><\/p>\n<p>\u53c2\u8003\uff1ahttps:\/\/github.com\/facebook\/react\/issues\/24502<\/p>\n<h3><span class=\"ez-toc-section\" id=\"React%E3%81%A7%E5%88%9D%E5%9B%9EuseEffect%E3%81%8C2%E5%9B%9E%E5%91%BC%E3%81%B0%E3%82%8C%E3%82%8B%E4%BA%8B%E8%B1%A1%E3%82%92%E5%86%8D%E7%8F%BE\"><\/span>React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u4e8b\u8c61\u3092\u518d\u73fe<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u4e8b\u8c61\u3092\u518d\u73fe\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002<br \/>\n\u307e\u305a\u306fStrictMode\u306b\u5909\u66f4\u3057\u307e\u3059\u3002<\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">  root.render(\r\n  &lt;React.StrictMode&gt;\r\n    &lt;App \/&gt;\r\n  &lt;\/React.StrictMode&gt;\r\n);<\/code><\/pre>\n<p>useEffect\u4ed8\u304d\u306e\u30b3\u30fc\u30c9\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002<\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">import { useEffect }  from \"react\"\r\n\r\nfunction App() {\r\n\r\n  console.log(\"\u521d\u56de\u8d77\u52d5\u3057\u307e\u3057\u305f\")\r\n\r\n  \/\/useEffect\u306e\u51e6\u7406-\u3053\u3053\u304b\u3089\r\n  useEffect(() =&gt; {\r\n    console.log(\"useEffect\u304c\u547c\u3070\u308c\u307e\u3057\u305f\")\r\n  },[]);\r\n  \/\/useEffect\u306e\u51e6\u7406-\u3053\u3053\u307e\u3067\r\n\r\n  return (\r\n    &lt;div&gt;\r\n      useEffect\u8d77\u52d5\u56de\u6570\u78ba\u8a8d\r\n    &lt;\/div&gt;\r\n  );\r\n}\r\n\r\nexport default App;<\/code><\/pre>\n<p>useEffect\u306e\u7b2c\u4e8c\u5f15\u6570\u306e\u95a2\u6570\u306b\u5909\u6570\u300c[]\u300d\u3092\u6307\u5b9a\u3057\u3001\u521d\u56de\u30d6\u30e9\u30a6\u30b6\u8868\u793a\u304c\u3055\u308c\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u306e\u307f\u95a2\u6570\u306e\u51e6\u7406\u304c\u5b9f\u884c\u3059\u308b\u3088\u3046\u8a2d\u5b9a\u3092\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">  useEffect(() =&gt; {\r\n   \u2026\r\n    });\r\n  },[]);<\/code><\/pre>\n<p>\u30d6\u30e9\u30a6\u30b6\u3067\u8868\u793a\u3055\u305b\u308b\u3068\u3001<\/p>\n<p>\u521d\u56de\u30d6\u30e9\u30a6\u30b6\u8d77\u52d5\u6642\u306b\u4e8c\u56de\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u306d\u3002<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-7557\" src=\"http:\/\/kininariantenna.com\/wp-content\/uploads\/2022\/12\/120522_1329_1.png\" alt=\"\" width=\"602\" height=\"152\" \/><\/p>\n<p><!--\u5439\u304d\u51fa\u3057\u306f\u3058\u307e\u308a--><\/p>\n<div class=\"fukidashi1\">\n<div class=\"icon\">\n<div class=\"wphg\"><img loading=\"lazy\" src=\"\/wp-content\/uploads\/2021\/07\/taka_kao3.gif\" alt=\"\u30bf\u30ab\u30d2\u30ed\" width=\"110\" height=\"110\" \/><\/div>\n<div class=\"iconfont\">\u30bf\u30ab\u30d2\u30ed<\/div>\n<\/div>\n<div class=\"bubble\">\u3053\u306e\u7d50\u679c\u3092\u898b\u308b\u9650\u308a\u3001useEffect\u3068\u95a2\u4fc2\u306a\u304f2\u56de\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u3067\u3059\u306d\u2026<\/div>\n<\/div>\n<p><!--\u5439\u304d\u51fa\u3057\u7d42\u308f\u308a--><\/p>\n<h2><span class=\"ez-toc-section\" id=\"React%E3%81%A7%E5%88%9D%E5%9B%9EuseEffect%E3%81%8C2%E5%9B%9E%E5%91%BC%E3%81%B0%E3%82%8C%E3%82%8B%E5%95%8F%E9%A1%8C%E3%81%AE%E5%AF%BE%E5%87%A6%E6%B3%95\"><\/span>React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u554f\u984c\u306e\u5bfe\u51e6\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u554f\u984c\u306e\u5bfe\u51e6\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3092\u3057\u307e\u3059\u3002<\/p>\n<h3><span class=\"ez-toc-section\" id=\"React18%E3%81%AEStrictMode%E3%82%92%E7%84%A1%E5%8A%B9%E3%81%AB%E3%81%99%E3%82%8B\"><\/span>React18\u306eStrictMode\u3092\u7121\u52b9\u306b\u3059\u308b<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>React18\u306eStrictMode\u3092\u7121\u52b9\u306b\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<p>\u5909\u66f4\u524d<\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">  root.render(\r\n  &lt;React.StrictMode&gt;\r\n    &lt;App \/&gt;\r\n  &lt;\/React.StrictMode&gt;\r\n);<\/code><\/pre>\n<p>\u5909\u66f4\u5f8c<\/p>\n<pre style=\"padding: 0;\"><code class=\"language-javascript line-numbers\">  root.render(\r\n    &lt;App \/&gt;\r\n);<\/code><\/pre>\n<p>\u30d6\u30e9\u30a6\u30b6\u3092\u30ea\u30ed\u30fc\u30c9\u3059\u308b\u3068\u3001<\/p>\n<p>1\u56de\u306e\u307f\u306e\u5b9f\u884c\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u306d\uff01<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-7558\" src=\"http:\/\/kininariantenna.com\/wp-content\/uploads\/2022\/12\/120522_1329_2.png\" alt=\"\" width=\"602\" height=\"136\" \/><\/p>\n<p><!--\u5439\u304d\u51fa\u3057\u306f\u3058\u307e\u308a--><\/p>\n<div class=\"fukidashi1\">\n<div class=\"icon\">\n<div class=\"wphg\"><img loading=\"lazy\" src=\"\/wp-content\/uploads\/2021\/07\/taka_kao3.gif\" alt=\"\u30bf\u30ab\u30d2\u30ed\" width=\"110\" height=\"110\" \/><\/div>\n<div class=\"iconfont\">\u30bf\u30ab\u30d2\u30ed<\/div>\n<\/div>\n<div class=\"bubble\">\u304a\u305b\u3063\u304b\u3044\u6a5f\u80fd\u306e\u8a2d\u5b9a\u3092\u5916\u3057\u305f\u306e\u30671\u56de\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306b\u623b\u3063\u305f\u3068\u3044\u3046\u308f\u3051\u3067\u3059\u306d\u3002<\/div>\n<\/div>\n<p><!--\u5439\u304d\u51fa\u3057\u7d42\u308f\u308a--><\/p>\n<h2><span class=\"ez-toc-section\" id=\"%E3%81%95%E3%81%84%E3%81%94%E3%81%AB\"><\/span>\u3055\u3044\u3054\u306b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u3044\u304b\u304c\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n<p>\u4eca\u56de\u306f\u3001<\/p>\n<div class=\"endinfo\">\u30fbReact\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5<\/div>\n<p>\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n<p>\u307e\u305f\u3001\u4ed6\u306b\u3082\u4fbf\u5229\u306a\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u3088\u308d\u3057\u3051\u308c\u3070\u3054\u53c2\u7167\u9802\u3051\u308c\u3070\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3051\u3069\u3001\u305d\u3093\u306a\u4e2d\u3067\u60a9\u3080\u3053\u3068\u306f\u3001 \u30fbReact\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u3066\u3057\u307e\u3046\u304c\u539f\u56e0\u304c\u308f\u304b\u3089\u306a\u3044 \u30fbReact\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u3066\u3057\u307e\u3046\u304c\u3069\u3046\u5bfe\u51e6\u3057\u3066\u3088\u3044\u304b\u308f\u304b\u3089\u306a\u3044 \u3067\u3059\u3088\u306d\u3002 \u4eca\u56de\u306f\u305d\u3093\u306a\u304a&#8230;<\/p>\n","protected":false},"author":1,"featured_media":7390,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[169],"tags":[179],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.4.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5\uff01 - \u30ad\u30cb\u30ca\u30ea\u30a2\u30f3\u30c6\u30ca<\/title>\n<meta name=\"description\" content=\"React\u3067\u521d\u56deuseEffect\u304c2\u56de\u547c\u3070\u308c\u308b\u539f\u56e0\u3068\u5bfe\u51e6\u6cd5\u306b\u3064\u3044\u3066\u307e\u3068\u3081\u307e\u3059\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/kininariantenna.com\/?p=7552\" \/>\n<meta property=\"og:locale\" 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