{"id":3493,"date":"2022-08-04T19:02:57","date_gmt":"2022-08-04T10:02:57","guid":{"rendered":"https:\/\/dennie.tokyo\/it\/?p=3493"},"modified":"2022-08-04T19:39:02","modified_gmt":"2022-08-04T10:39:02","slug":"%e3%80%90react%e3%80%91%e3%82%a4%e3%83%99%e3%83%b3%e3%83%88%e3%83%8f%e3%83%b3%e3%83%89%e3%83%a9","status":"publish","type":"post","link":"https:\/\/dennie.tokyo\/it\/?p=3493","title":{"rendered":"\u3010React\u3011\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9"},"content":{"rendered":"\n

\u524d\u56de\u306f\u30bf\u30a4\u30de\u30fc\u95a2\u6570\u3092\u4f7f\u7528\u3057\u30b9\u30c6\u30fc\u30c8\u5024\u3092\u66f4\u65b0\u3057\u3001\u753b\u9762\u3078\u8868\u793a\u3055\u308c\u308b\u5185\u5bb9\u3092\u52d5\u7684\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n\n\n\n\n\n\n\n

\u524d\u56de<\/span>\n

<\/p>\n

\u3010React\u3011\u30b9\u30c6\u30fc\u30c8\u306b\u3088\u308b\u30c7\u30fc\u30bf\u66f4\u65b0<\/a><\/p>\n<\/div>\n\n\n\n

\u4eca\u56de\u306f\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u3092\u4f7f\u7528\u3057\u3066\u30b9\u30c6\u30fc\u30c8\u5024\u3092\u66f4\u65b0\u3057\u753b\u9762\u306b\u8868\u793a\u3055\u308c\u308b\u5185\u5bb9\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\u3084\u308a\u305f\u3044\u3053\u3068<\/h1>\n\n\n\n

\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u3092\u62bc\u3059\u3068\u3001\u3069\u306e\u30dc\u30bf\u30f3\u304c\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u753b\u9762\u306b\u8868\u793a\u3055\u305b\u307e\u3059\u3002\u4f55\u3082\u9078\u629e\u3055\u308c\u3066\u3044\u306a\u3044\u6642\u306f\u3001\u4f55\u3082\u9078\u629e\u3055\u308c\u3066\u3044\u306a\u3044\u65e8\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u306e\u5b9f\u88c5<\/h1>\n\n\n\n

\u4eca\u56de\u306f\u3001\u300c\u653b\u6483\u300d\u3001\u300c\u9632\u5fa1\u300d\u3092\u9078\u629e\u51fa\u6765\u308b\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u306e\u5185\u5bb9\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002
\u306a\u304a\u3001\u4ee5\u964d\u306fApp\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3078\u5b9f\u88c5\u3057\u3066\u3044\u304f\u4e8b\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

  \/\/ \u30d6\u30e9\u30a6\u30b6\u8868\u793a\u51e6\u7406\n  return (\n    <>\n      <div>\n        <input type="radio" value="attack" onChange={selectVal} checked={val === 'attack'}\/>\u653b\u6483\n      <\/div>\n      <div>\n        <input type="radio" value="defend" onChange={selectVal} checked={val === 'defend'}\/>\u9632\u5fa1\n      <\/div>\n      <p>{"\u4eca\u9078\u629e\u3057\u3066\u3044\u308b\u306e\u306f\uff1a" + nowSelect(val)}<\/p>\n    <\/>\n  );<\/code><\/pre><\/div>\n\n\n\n
\u5f8c\u3067\u8aac\u660e\u3057\u307e\u3059\u304c\u3001val \u306f\u30b9\u30c6\u30fc\u30c8\u5024\u306b\u306a\u308a\u307e\u3059\u3002val \u306e\u5024\u304c\u3001”attack” \u306e\u5834\u5408\u3001checked\u30d7\u30ed\u30d1\u30c6\u30a3\u304ctrue\u3068\u306a\u308b\u306e\u3067\u300c\u653b\u6483\u300d\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u304c\u30c1\u30a7\u30c3\u30af\u3055\u308c\u307e\u3059\u3002”defend”\u3082\u540c\u69d8\u3067\u3059\u3002<\/p>\n\n\n\n
onChange \u30d7\u30ed\u30d1\u30c6\u30a3\u306f\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u306b\u306a\u308a\u307e\u3059\u3002\u3053\u308c\u3082\u5f8c\u3067\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
nowSelect\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u304c\u3001nowSelect\u95a2\u6570\u306f\u3069\u306e\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u304c\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002\u3053\u308c\u3082\u5f8c\u3067\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u306e\u5b9f\u88c5<\/h1>\n\n\n\n
React\u306e\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u3067\u306f onChange\u30d7\u30ed\u30d1\u30c6\u30a3\u306b\u5bfe\u3057\u3066 \u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9 \u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u306f\u30a4\u30d9\u30f3\u30c8\u60c5\u5831\u3092\u5f15\u6570\u3068\u3057\u305f\u95a2\u6570\u306b\u306a\u308a\u307e\u3059\u3002
\u4eca\u56de\u306f onChange\u30d7\u30ed\u30d1\u30c6\u30a3 \u3078 selectVal\u95a2\u6570\u3092\u6e21\u3057\u3066\u3044\u307e\u3059\u3002selectVal\u95a2\u6570\u306f\u3001\u30a4\u30d9\u30f3\u30c8\u60c5\u5831(e)\u3092\u5f15\u6570\u3068\u3057\u307e\u3059\u3002
e.target.value \u304b\u3089\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u3067\u9078\u629e\u3055\u308c\u305f\u8981\u7d20\u306evalue\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u5024\u304c\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002\u300c\u653b\u6483\u300d\u3092\u9078\u629e\u3057\u305f\u5834\u5408\u3001”attack”\u304c\u53d6\u5f97\u3067\u304d\u307e\u3059\u3002
\u53d6\u5f97\u3057\u305f\u5024\u3092\u30b9\u30c6\u30fc\u30c8\u5024\u66f4\u65b0\u95a2\u6570(setVal)\u3078\u6e21\u3057\u3001\u30b9\u30c6\u30fc\u30c8\u5024\u3092\u66f4\u65b0\u3057\u3066\u3044\u307e\u3059\u3002
\u3053\u306e\u52d5\u4f5c\u306f\u3001\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u304c\u9078\u629e\u3055\u308c\u308b\u5ea6\u306b\u8d77\u3053\u308a\u307e\u3059\u3002<\/p>\n\n\n\n
  \/\/ \u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\n  const selectVal = e => setVal(e.target.value);\n  \n  \/\/ \u30d6\u30e9\u30a6\u30b6\u8868\u793a\u51e6\u7406\n  return (\n    <>\n      <div>\n        <input type="radio" value="attack" onChange={selectVal} checked={val === 'attack'}\/>\u653b\u6483\n      <\/div>\n      <div>\n        <input type="radio" value="defend" onChange={selectVal} checked={val === 'defend'}\/>\u9632\u5fa1\n      <\/div>\n      <p>{"\u4eca\u9078\u629e\u3057\u3066\u3044\u308b\u306e\u306f\uff1a" + nowSelect(val)}<\/p>\n    <\/>\n  );<\/code><\/pre><\/div>\n\n\n\n
\u9078\u629e\u3055\u308c\u305f\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u306e\u8868\u793a<\/h1>\n\n\n\n
nowSelect\u95a2\u6570\u306f\u30b9\u30c6\u30fc\u30c8\u5024\u3092\u53d7\u3051\u53d6\u308a\u3001\u4eca\u3069\u306e\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u304c\u9078\u629e\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u5224\u65ad\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
  \/\/ \u9078\u629e\u3055\u308c\u305f\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u306e\u5024\u306b\u3088\u3063\u3066\u3001\u6587\u5b57\u5217\u3092\u8fd4\u5374\u3059\u308b\u3002\n  const nowSelect = val => {\n    let command = '';\n    switch (val) {\n        case 'attack':\n            command = '\u653b\u6483';\n            break;\n        case 'defend':\n            command = '\u9632\u5fa1';\n            break;\n        default:\n            command = '\u4f55\u3082\u9078\u629e\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002';\n    }\n    return command;\n  };<\/code><\/pre><\/div>\n\n\n\n
\u524d\u8ff0\u3067\u3082\u3042\u308a\u307e\u3057\u305f\u304c\u3001\u4ee5\u4e0b\u306f\u3001\u30b9\u30c6\u30fc\u30c8\u5024\u3092\u5f15\u6570\u3068\u3057\u3066nowSelect\u95a2\u6570\u3092\u547c\u3073\u51fa\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
<p>{"\u4eca\u9078\u629e\u3057\u3066\u3044\u308b\u306e\u306f\uff1a" + nowSelect(val)}<\/p><\/code><\/pre><\/div>\n\n\n\n
\u30b9\u30c6\u30fc\u30c8\u306e\u5229\u7528<\/h1>\n\n\n\n
\u30b9\u30c6\u30fc\u30c8\u306e\u5229\u7528\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n
  \/\/ \u30b9\u30c6\u30fc\u30c8\n  const [val, setVal] = React.useState();<\/code><\/pre><\/div>\n\n\n\n
\u5b8c\u6210<\/h1>\n\n\n\n
App\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u5b9f\u88c5\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\u3002<\/p>\n\n\n\n
import React from 'react';\n\nfunction App() {\n\n  \/\/ \u30b9\u30c6\u30fc\u30c8\n  const [val, setVal] = React.useState();\n\n  \/\/ \u9078\u629e\u3055\u308c\u305f\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u306e\u5024\u306b\u3088\u3063\u3066\u3001\u6587\u5b57\u5217\u3092\u8fd4\u5374\u3059\u308b\u3002\n  const nowSelect = val => {\n    let command = '';\n    switch (val) {\n        case 'attack':\n            command = '\u653b\u6483';\n            break;\n        case 'defend':\n            command = '\u9632\u5fa1';\n            break;\n        default:\n            command = '\u4f55\u3082\u9078\u629e\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002';\n    }\n    return command;\n  };\n\n  \/\/ \u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\n  const selectVal = e => setVal(e.target.value);\n  \n  \/\/ \u30d6\u30e9\u30a6\u30b6\u8868\u793a\u51e6\u7406\n  return (\n    <>\n      <div>\n        <input type="radio" value="attack" onChange={selectVal} checked={val === 'attack'}\/>\u653b\u6483\n      <\/div>\n      <div>\n        <input type="radio" value="defend" onChange={selectVal} checked={val === 'defend'}\/>\u9632\u5fa1\n      <\/div>\n      <p>{"\u4eca\u9078\u629e\u3057\u3066\u3044\u308b\u306e\u306f\uff1a" + nowSelect(val)}<\/p>\n    <\/>\n  );\n}\n\nexport default App;<\/code><\/pre><\/div>\n\n\n\n
\u6700\u521d\u306f\u30b9\u30c6\u30fc\u30c8\u5024\u304c null \u306a\u306e\u3067\u300c\u4f55\u3082\u9078\u629e\u3055\u308c\u3066\u3044\u307e\u305b\u3093\u3002\u300d\u304c\u30d6\u30e9\u30a6\u30b6\u3078\u8868\u793a\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u3092\u9078\u629e\u3059\u308b\u3068\u3001\u9078\u629e\u3057\u305f\u8981\u7d20\u306e\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9(selectVal\u95a2\u6570)\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002
\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u304c\u5b9f\u884c\u3055\u308c\u308b\u3068\u30b9\u30c6\u30fc\u30c8\u5024\u66f4\u65b0\u95a2\u6570(setVal)\u3078\u3001\u9078\u629e\u3055\u308c\u305f\u30e9\u30b8\u30aa\u30dc\u30bf\u30f3\u306evalue\u30d7\u30ed\u30d1\u30c6\u30a3\u5024\u304c\u6e21\u3055\u308c\u30b9\u30c6\u30fc\u30c8\u5024\u304c\u66f4\u65b0\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
nowSelect\u95a2\u6570\u306f\u30b9\u30c6\u30fc\u30c8\u5024\u3092\u5f15\u6570\u3068\u3057\u3066\u3044\u308b\u306e\u3067val\u306e\u5024\u304c\u5909\u308f\u308b\u3068\u5f53\u95a2\u6570\u304c\u5b9f\u884c\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
\u3053\u306e\u3088\u3046\u306b\u3001\u30b9\u30c6\u30fc\u30c8\u306e\u5024\u3092\u66f4\u65b0\u3059\u308b\u3068\u3001\u305d\u308c\u306b\u95a2\u9023\u3059\u308b\u51e6\u7406\u304c\u5b9f\u884c\u3055\u308c\u7d50\u679c\u753b\u9762\u306e\u8868\u793a\u5185\u5bb9\u3082\u66f4\u65b0\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u306e\u66f8\u304d\u65b9<\/h1>\n\n\n\n
\u30a2\u30ed\u30fc\u95a2\u6570\u306e\u4f7f\u7528<\/h2>\n\n\n\n
\u4f59\u8ac7\u3067\u3059\u304c\u3001\u30a4\u30d9\u30f3\u30c8\u30cf\u30f3\u30c9\u30e9\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3082\u66f8\u3051\u307e\u3059\u3002<\/p>\n\n\n\n
<input type="radio" value="attack" onChange={e => setVal(e.target.value)} checked={val === 'attack'}\/>\u653b\u6483<\/code><\/pre><\/div>\n\n\n\n
\u6700\u5f8c\u306b<\/h1>\n\n\n\n
\u7279\u306b\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u524d\u56de\u306f\u30bf\u30a4\u30de\u30fc\u95a2\u6570\u3092\u4f7f\u7528\u3057\u30b9\u30c6\u30fc\u30c8\u5024\u3092\u66f4\u65b0\u3057\u3001\u753b\u9762\u3078\u8868\u793a\u3055\u308c\u308b\u5185\u5bb9\u3092\u52d5\u7684\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n","protected":false},"author":1,"featured_media":976,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29,1],"tags":[],"class_list":["post-3493","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-react","category-1"],"_links":{"self":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/3493","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3493"}],"version-history":[{"count":9,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/3493\/revisions"}],"predecessor-version":[{"id":3506,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/3493\/revisions\/3506"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/media\/976"}],"wp:attachment":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3493"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3493"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3493"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}