{"id":3618,"date":"2022-08-29T19:14:23","date_gmt":"2022-08-29T10:14:23","guid":{"rendered":"https:\/\/dennie.tokyo\/it\/?p=3618"},"modified":"2022-09-03T09:25:02","modified_gmt":"2022-09-03T00:25:02","slug":"%e3%80%90react%e3%80%91%e5%89%af%e4%bd%9c%e7%94%a8","status":"publish","type":"post","link":"https:\/\/dennie.tokyo\/it\/?p=3618","title":{"rendered":"\u3010React\u3011\u526f\u4f5c\u7528"},"content":{"rendered":"\n<p>React\u306f\u30c7\u30fc\u30bf\u306e\u5909\u66f4\u3092\u8d77\u56e0\u3068\u3057\u3066\u753b\u9762\u304c\u63cf\u753b\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<!--more-->\n\n\n\n<p>\u63cf\u753b\u3057\u305f\u5f8c\u306b\u4f55\u304b\u51e6\u7406\u3092\u884c\u3044\u305f\u3044\u5834\u5408\u304c\u3042\u308a\u307e\u3059\u3002<br>useEffect\u30d5\u30c3\u30af \u3092\u4f7f\u3046\u4e8b\u3067\u63cf\u753b\u5f8c\u306b\u884c\u3044\u305f\u3044\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">\u63cf\u753b\u5f8c\u306e\u51e6\u7406<\/h1>\n\n\n\n<p>\u63cf\u753b\u5f8c\u306b\u884c\u3046\u51e6\u7406\u3068\u3057\u3066\u306f\u3001\u63cf\u753b\u3068\u306f\u95a2\u4fc2\u306a\u3044\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u3068\u826f\u3044\u3067\u3057\u3087\u3046\u3002\u4f8b\u3048\u3070\u3001WEB API\u306e\u3088\u3046\u306a\u975e\u540c\u671f\u51e6\u7406\u306fuseEffect\u3092\u7528\u3044\u3066\u5b9f\u884c\u3059\u308b\u4e8b\u304c\u591a\u3044\u3067\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\">useEffect\u306e\u4f7f\u3044\u65b9<\/h1>\n\n\n\n<p>useEffect \u306f\u95a2\u6570\u3092\u5f15\u6570\u3068\u3057\u307e\u3059\u3002\u63cf\u753b\u5f8c\u306b\u884c\u3044\u305f\u3044\u51e6\u7406\u3092\u95a2\u6570\u3068\u3057\u3066 useEffect \u3078\u6e21\u3057\u307e\u3059\u3002\u3053\u306e\u95a2\u6570\u306e\u4e8b\u3092 <strong>\u63cf\u753b\u95a2\u6570<\/strong> \u3068\u8a00\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>  const showLog = () =&gt; console.log(count + &quot;\u56de&quot;);\n\n  useEffect(showLog)<\/code><\/pre><\/div>\n\n\n\n<h1 class=\"wp-block-heading\">useEffect\u306e\u4f8b<\/h1>\n\n\n\n<p>\u7c21\u5358\u306a\u4f8b\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<br>\u4eca\u56de\u306f\u30dc\u30bf\u30f3\u3092\u62bc\u3059\u3068\u3001\u62bc\u3057\u305f\u56de\u6570\u3092\u30ed\u30b0\u306b\u51fa\u529b\u3059\u308b\u3088\u3046\u306b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/h2>\n\n\n\n<p>\u4eca\u56de\u306fApp\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u307f\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">App\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8<\/h3>\n\n\n\n<p>App\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-js\" data-lang=\"JavaScript\"><code>import React, {useState, useEffect} from &#39;react&#39;;\n\nfunction App() {\n\n  const [count, setCount] = useState(0);\n\n  useEffect(() =&gt; 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