{"id":1741,"date":"2019-06-24T13:58:45","date_gmt":"2019-06-24T17:58:45","guid":{"rendered":"https:\/\/www.a2life.info\/w\/?p=1741"},"modified":"2019-06-25T20:10:21","modified_gmt":"2019-06-26T00:10:21","slug":"react-revisited-after-version-16-8","status":"publish","type":"post","link":"https:\/\/www.a2life.info\/w\/?p=1741","title":{"rendered":"React Revisited after version 16.8"},"content":{"rendered":"

React\u3000\u3068\u3044\u3046\u306e\u306f\u3000DOM\u306e\u5185\u5bb9\u3092\u7c21\u5358\u306b\u64cd\u4f5c\u3057\u3088\u3046\u3068\u3044\u3046\u3000JavaScript\u306e\u30e9\u30a4\u30d6\u30e9\u30ea\u30fc\u306e\u4e00\u3064\u3060\u304c\u3001Shadow DOM\u3068\u3044\u3046\u6982\u5ff5\u3092\u5c0e\u5165\u3057\u3001JQuery\u306e\u3088\u3046\u306b\u30b3\u30de\u30f3\u30c9\u3054\u3068\u306e\u5b9f\u884c\u3067DOM\u3092\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u306f\u305b\u305a\u3001Shadow DOM\u306b\u3042\u308b\u7a0b\u5ea6\u66f8\u304d\u8fbc\u3093\u3067\u304a\u3044\u3066\u304b\u3089\u63cf\u753b\u3059\u308b\u76f4\u524d\u306b\u307e\u3068\u3081\u3066DOM\u306b\u66f8\u304d\u8fbc\u3080\u3002\u306a\u306e\u3067\u8efd\u5feb\u306b\u52d5\u4f5c\u3059\u308b\u3001\u3068\u3044\u3046\u306e\u304c\u58f2\u308a\u3002<\/p>\n

\u6570\u5e74\u524d\u306b\u899a\u3048\u3088\u3046\u3068\u3057\u305f\u306e\u3060\u304c\u3001\u3000\u4e8c\u70b9\u8151\u306b\u843d\u3061\u306a\u3044\u3068\u3053\u308d\u304c\u3042\u3063\u3066\u3001\u7d50\u5c40\u3001Vue.js\u3068\u3044\u3046\u4ed6\u306eLibrary\u3092\u611b\u7528\uff08\u6eba\u611b\uff09\u3059\u308b\u306b\u81f3\u3063\u305f\u3002<\/p>\n

\u305d\u306e\u4e8c\u70b9\u3068\u3044\u3046\u306e\u304c<\/p>\n

1\uff0eJSX\u3068\u3044\u3046\u65b0\u3057\u3044\u6982\u5ff5\u306e\u5c0e\u5165\u3002\u3000\u4e00\u898b\u3059\u308b\u3068HTML\u306a\u306e\u3060\u304cHTML\u3067\u306f\u306a\u304f\u3001XML\u66f8\u5f0f\u3092JavaScript\u3067\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u305f\u30d7\u30ea\u30d7\u30ed\u30bb\u30c3\u30b5\u3002\u3053\u306e\u4e00\u898bHTML\u3068\u3044\u3046\u306e\u304c\u304f\u305b\u3082\u306e\u3067\u3001class= \u306fJS\u306e\u4e88\u7d04\u7528\u8a9e\u3086\u3048\u306b\u4f7f\u3048\u305aclassName\uff1d\u306b\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u306a\u3069\u3001\u7d30\u304b\u3044\u3068\u3053\u308d\u3067\u9055\u3063\u3066\u3044\u3066\u6c17\u6301\u3061\u304c\u308f\u308b\u3044\u3002\uff08\u3053\u308c\u306b\u6bd4\u3079\u3066Vue\u306eTemplate\u306f\u307e\u3054\u3046\u3053\u3068\u306a\u304dHTML\u306e\u62e1\u5f35\uff09<\/p>\n

\uff12\uff0e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u64cd\u4f5c\u3067\u304d\u308b\u5909\u6570\uff08State\uff09\u3092\u4f7f\u3046\u305f\u3081\u306b\u306f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092Class\u8868\u8a18\u3057\u3066setState()\u3068\u3044\u3046\u95a2\u6570\u3092\u4f7f\u3063\u3066\u7ba1\u7406\u3057\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002<\/p>\n

\u3068\u3044\u3046\u3082\u306e\u3002<\/p>\n

\u305d\u306e\u5f8c\u3000\u300cJSX\u306f\u5358\u306a\u308bJavaScript\u306e\u95a2\u6570\u8868\u73fe\u300d\u3068\u3044\u3046\u958b\u767a\u30c1\u30fc\u30e0\u306e\u89e3\u8aac\u3092Youtube\u3067\u307f\u3066\u3000\u30b9\u30c8\u30f3\u3068\u7d0d\u5f97\u3067\u304d\u308b\u3082\u306e\u304c\u3042\u3063\u305f\u3082\u306e\u306e\u3001\u3000\u4e8c\u3064\u76ee\u306eJavaScript\u306bClass\u304c\u5fc5\u8981\u3068\u3044\u3046\u306e\u304c\u306a\u3093\u3068\u3082\u7d0d\u5f97\u3044\u304b\u306a\u3044\uff08\u500b\u4eba\u306e\u610f\u898b\u3067\u3059\uff09\u8eab\u3068\u3057\u3066\u306f\u4eca\u3044\u3061\u624b\u304c\u51fa\u305b\u305a\u306b\u3044\u305f\u3002\u3000Class\u8868\u8a18\u3092\u3059\u308b\u3042\u307e\u308a\u3001\u3000this\u306e\u591a\u7528\u3092\u884c\u3044\u3001\u3057\u304b\u3082\u305d\u306eContext\u3092\u660e\u793a\u3059\u308b\u305f\u3081\u306bClass Constructor\u306b\u3000this.function=this.function.bind(this) \u3092\u66f8\u304d\u307e\u304f\u308b\u3068\u3044\u3046\u306e\u304c\u306a\u3093\u3068\u3082\u5207\u306a\u3044\u3002<\/p>\n

\u3057\u304b\u3057\u306a\u304c\u3089\u3001\u3000React\u306e\u52e2\u3044\u306f\u4fae\u308a\u304c\u305f\u3044\u3082\u306e\u304c\u3042\u308b\u3002\u3000\u7279\u306bMicrosoft\u306eOffice\u958b\u767a\u7cfb\u306e\u65b9\u305f\u3061\u306f\u3000Office UI Graphics\u306eComponent\u306b\u300cReact\u306f\u6b63\u7fa9\uff01\u300d\u3068\u3044\u3046\u611f\u3058\u3067\u4f7f\u3044\u307e\u304f\u3063\u3066\u3044\u308b\u3002\u3000SharePoinit\u306e\u3000JavaScript\u3000Frame work\u3082\u3000React\u3073\u3044\u304d\u304c\u3059\u3054\u3044\u3002<\/p>\n

\u3067\u3001\u6700\u8fd1React-client-app\u3068\u3044\u3046CLI\u3067React\u306eScaffolding\u304c\u7c21\u5358\u306b\u3067\u304d\u307e\u3059\u3001\u3068\u3044\u3046\u8a18\u4e8b\u3092\u3088\u304f\u898b\u308b\u306e\u3067\u3001\u5b9f\u969b\u3069\u308c\u304f\u3089\u3044\u7c21\u5358\u306a\u3093\u3060\u3044\u3068\u8a66\u3057\u3066\u307f\u305f\u3089\u3001\u3000\u751f\u6210\u3055\u308c\u308bScaffolding\u306eComponent\u304cClass\u8868\u8a18\u3067\u306f\u306a\u304ffunction\u8868\u8a18\u306b\u306a\u3063\u3066\u3044\u308b\u3002\u3000\u3042\u308c\u3001\u3053\u308c\u3063\u3066\u3001Stateful\u3000Component\u306f\u3000Class\u8868\u8a18\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u3093\u3058\u3083\u306a\u304b\u3063\u305f\u3063\u3051\u3001\u3068\u601d\u3063\u305f\u304c\u3001\u3000\u5b9f\u306fReact\u3082\u9032\u5316\u3057\u3066\u3044\u305f\u3002<\/p>\n

Version\u300016.8\u304b\u3089\u3000Hooks\u3068\u3044\u3046\u6a5f\u80fd\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3000Functional Component\u3067\u3082State\u306e\u7ba1\u7406\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u305f\u3002\u3000\u305d\u3057\u3066\u4eca\u307e\u3067\u3001\u3000Functional Component = Stateless Component,\u3000Class Componnet=Stateful Component\u3068\u306a\u3063\u3066\u3044\u305f\u3082\u306e\u304c\u3001\u3000\u3069\u3061\u3089\u3092\u4f7f\u3063\u3066\u3082\u3088\u3044\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u308b\u3002\u3000React\u306e\u30b5\u30a4\u30c8\u306b\u3082\u5c06\u6765\u306e\u958b\u767a\u306b\u306fFunctional Component\u3092\u4f7f\u3046\u306e\u304c\u304a\u3059\u3059\u3081\u3068\u66f8\u3044\u3066\u3042\u308b\u3002\u3000\u306a\u306e\u3067\u3001React-client-app\u3082Default\u3067\u751f\u6210\u3059\u308b\u30b3\u30fc\u30c9\u306f\u30af\u30e9\u30b9\u30ec\u30b9\u306b\u306a\u3063\u3066\u3044\u305f\u308f\u3051\u3060\u3002<\/p>\n

\u7d39\u4ecb\u30da\u30fc\u30b8\u3000https:\/\/reactjs.org\/docs\/hooks-intro.html<\/a>\u3000\u306b\u3042\u308b\u30b3\u30fc\u30c9\u3092\u307f\u308c\u3070\u4e00\u76ee\u77ad\u7136\u3060\u304c\u3001\u30af\u30e9\u30b9\u8868\u8a18\u306e\u3088\u3046\u306aConstructor\u3082\u306a\u3051\u308c\u3070\u3001this. \u3067\u30e1\u30f3\u30d0\u30fc\u6307\u5b9a\u3092\u3059\u308b\u3053\u3068\u3082\u306a\u3044\u3002\u3000\u975e\u5e38\u306b\u7c21\u5358\u3002\u3000\u305f\u3060\u3001\u3053\u306eHook\u3092\u4f7f\u3063\u305f\u30af\u30e9\u30b9\u30ec\u30b9\u306e\u30b9\u30c6\u30fc\u30c8\u30d5\u30eb\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u4f5c\u308a\u65b9\u3001\u30aa\u30d5\u30a3\u30b7\u30e3\u30eb\u30b5\u30a4\u30c8\u4ee5\u5916\u3067\u89e3\u8aac\u3057\u3066\u3044\u308b\u30b5\u30a4\u30c8\u306f\u307e\u3060\u5c11\u306a\u3044\u3002<\/p>\n

\u3053\u306e<\/p>\n

\n
const [ var1, setVar1]=useState('this is variable one');<\/pre>\n<\/blockquote>\n
\u3067\u6c17\u3092\u3064\u3051\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u306e\u306f\u3000Var1\u304c\u8907\u6570\u30e1\u30f3\u30d0\u30fc\u304b\u3089\u69cb\u6210\u3055\u308c\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3060\u3063\u305f\u5834\u5408\u3001<\/p>\n
\n
const [obj1,setObj1]=useState({member1:\"this is member 1\", member2:\"this is member 2\"})<\/pre>\n<\/blockquote>\n
\u306e\u3088\u3046\u306b\u3000Obj1\u3092\u5ba3\u8a00\u3057\u305f\u3068\u304d\u306b\u3001<\/p>\n
\n
setObj1({member2:\"this is member 2 modified\"})<\/pre>\n<\/blockquote>\n
\u3068\u3084\u3063\u3066\u3082setState()\u3068\u9055\u3063\u3066\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u4ed6\u306e\u30e1\u30f3\u30d0\u30fc\uff08Key)\u3068\u30de\u30fc\u30b8\u3057\u3066\u304f\u308c\u306a\u3044\u3002\u4e0a\u306e\u4f8b\u3067\u306fmember1\u304c\u6d88\u3048\u3066\u3057\u307e\u3046\u3002<\/p>\n
\u30bb\u30c3\u30c8\u95a2\u6570\u306b\u306f\u5143\u306estate\u304c\u30d1\u30e9\u30e1\u30fc\u30bf\u3068\u3057\u3066\u6e21\u3055\u308c\u3066\u3044\u308b\u306e\u3092\u5229\u7528\u3057\u3066\u3001<\/p>\n
\n
setObj1(s=>({ ...s, member2:\"this is member 2 modified\"}))<\/pre>\n<\/blockquote>\n
\u3068\u30b9\u30d7\u30ec\u30c3\u30c9\u8868\u8a18\u3092\u4f7f\u3063\u3066\u30de\u30fc\u30b8\u3057\u3066\u3042\u3052\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002\uff08\u4e0a\u306e\u30b5\u30a4\u30c8\u306b\u306fObject.create\u3092\u4f7f\u3046\u306e\u3082\u53ef\u3068\u66f8\u3044\u3066\u3042\u308b\uff09<\/p>\n
\u307e\u305f\u3001\u3044\u308f\u3086\u308b\u3000ComponentWillMount\u306a\u3069\u306eLife Cycle hook\u306e\u4ee3\u308f\u308a\u306b\u306f\u63cf\u753b\u6bce\u306b\u767a\u706b\u3059\u308buseEffect()\u3092\u4f7f\u3048\u3068\u66f8\u3044\u3066\u3042\u308b\u3002\u3000\u3053\u306eHook\u306f\u767a\u706b\u3092\u9650\u5b9a\u3059\u308b\u305f\u3081\u306b\u4e8c\u3064\u76ee\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u2015\u3067\u767a\u706b\u3059\u308b\u6761\u4ef6\u3092\u6307\u5b9a\u3067\u304d\u308b\u3002\u3000\u30d5\u30a1\u30a4\u30eb\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080\u306a\u3069\u3001\u3042\u308b\u3044\u306f\u30a4\u30d9\u30f3\u30c8\u30ea\u30b9\u30ca\u30fc\u3092\u8a2d\u5b9a\u3059\u308b\u306a\u3069\u3001\u4e00\u56de\u3060\u3051\u767a\u706b\u3055\u305b\u305f\u3044\u5834\u5408\u3001\u3000\u3053\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\u30fc\u3092\u7a7a\u306e\u30a2\u30ec\u30a4\u3067\u6e21\u3057\u3066\u3042\u3052\u308b\u3053\u3068\u3067\u5b9f\u73fe\u3067\u304d\u308b\u3002\uff08\u306a\u3093\u3068\u306a\u304f\u30cf\u30c3\u30af\u3063\u307d\u3044\u304c\uff09<\/p>\n
\n
useEffect(\uff08\uff09\uff1d\uff1e\uff5bData \u3092\u8aad\u307f\u8fbc\u3080\u4e91\u3005\uff5d, [])<\/pre>\n<\/blockquote>\n
\u4ed6\u306b\u3082\u4f55\u7a2e\u985e\u304b\u306eHooks\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\u304c\u3001\u3000\u6f14\u7fd2\u7528\u306b\u30a2\u30d7\u30ea\u3092\u66f8\u3044\u3066\u307f\u308b\u3068\u3001\u4e0a\u306e\u4e8c\u3064\u306eHook\u3060\u3051\u3067\u3001\u305d\u308c\u306a\u308a\u306e\u3082\u306e\u304c\u3067\u304d\u308b\u3002<\/p>\n
\u3059\u3067\u306bJSX\u3078\u306e\u30a2\u30ec\u30eb\u30ae\u30fc\u306f\u306a\u304f\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u30af\u30e9\u30b9\u3092\u4f7f\u308f\u306a\u304f\u3066\u3088\u3044React\u3068\u3044\u3046\u9078\u629e\u306f\u7d50\u69cb\u9b45\u529b\u7684\u3067\u3059\u3002<\/p>\n
\u3059\u3079\u3066\u306bVue.js\u3092\u4f7f\u3044\u305f\u3044\u306e\u306f\u3084\u307e\u3084\u307e\u306a\u308c\u3069\u3001SharePoint\u95a2\u9023\u306b\u304a\u3044\u3066MicroSoft \u304c React\u3042\u308a\u304d\u306e\u958b\u767a\u3092\u63a8\u3057\u3066\u3044\u308b\u3068\u3044\u3046\u306e\u306f\u3084\u306f\u308a\u5927\u304d\u3044\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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\u305d\u306e\u5f8c\u3000\u300cJSX\u306f\u5358\u306a\u308bJavaScript\u306e\u95a2\u6570\u8868\u73fe\u300d\u3068\u3044\u3046\u958b\u767a\u30c1\u30fc\u30e0\u306e\u89e3\u8aac\u3092Youtube\u3067\u307f\u3066\u3000\u30b9\u30c8\u30f3\u3068\u7d0d\u5f97\u3067\u304d\u308b\u3082\u306e\u304c\u3042\u3063\u305f\u3082\u306e\u306e\u3001\u3000\u4e8c\u3064\u76ee\u306eJavaScript\u306bClass\u304c\u5fc5\u8981\u3068\u3044\u3046\u306e\u304c\u306a\u3093\u3068\u3082\u7d0d\u5f97\u3044\u304b\u306a\u3044\uff08\u500b\u4eba\u306e\u610f\u898b\u3067\u3059\uff09\u8eab\u3068\u3057\u3066\u306f\u4eca\u3044\u3061\u624b\u304c\u51fa\u305b\u305a\u306b\u3044\u305f\u3002\u3000Class\u8868\u8a18\u3092\u3059\u308b\u3042\u307e\u308a\u3001\u3000this\u306e\u591a\u7528\u3092\u884c\u3044\u3001\u3057\u304b\u3082\u305d\u306eContext\u3092\u660e\u793a\u3059\u308b\u305f\u3081\u306bClass Constructor\u306b\u3000this.function=this.function.bind(this) \u3092\u66f8\u304d\u307e\u304f\u308b\u3068\u3044\u3046\u306e\u304c\u306a\u3093\u3068\u3082\u5207\u306a\u3044\u3002 \u3057\u304b\u3057\u306a\u304c\u3089\u3001\u3000React\u306e\u52e2\u3044\u306f\u4fae\u308a\u304c\u305f\u3044\u3082\u306e\u304c\u3042\u308b\u3002\u3000\u7279\u306bMicrosoft\u306eOffice\u958b\u767a\u7cfb\u306e\u65b9\u305f\u3061\u306f\u3000Office UI Graphics\u306eComponent\u306b\u300cReact\u306f\u6b63\u7fa9\uff01\u300d\u3068\u3044\u3046\u611f\u3058\u3067\u4f7f\u3044\u307e\u304f\u3063\u3066\u3044\u308b\u3002\u3000SharePoinit\u306e\u3000JavaScript\u3000Frame work\u3082\u3000React\u3073\u3044\u304d\u304c\u3059\u3054\u3044\u3002 \u3067\u3001\u6700\u8fd1React-client-app\u3068\u3044\u3046CLI\u3067React\u306eScaffolding\u304c\u7c21\u5358\u306b\u3067\u304d\u307e\u3059\u3001\u3068\u3044\u3046\u8a18\u4e8b\u3092\u3088\u304f\u898b\u308b\u306e\u3067\u3001\u5b9f\u969b\u3069\u308c\u304f\u3089\u3044\u7c21\u5358\u306a\u3093\u3060\u3044\u3068\u8a66\u3057\u3066\u307f\u305f\u3089\u3001\u3000\u751f\u6210\u3055\u308c\u308bScaffolding\u306eComponent\u304cClass\u8868\u8a18\u3067\u306f\u306a\u304ffunction\u8868\u8a18\u306b\u306a\u3063\u3066\u3044\u308b\u3002\u3000\u3042\u308c\u3001\u3053\u308c\u3063\u3066\u3001Stateful\u3000Component\u306f\u3000Class\u8868\u8a18\u3057\u306a\u3051\u308c\u3070\u3044\u3051\u306a\u3044\u3093\u3058\u3083\u306a\u304b\u3063\u305f\u3063\u3051\u3001\u3068\u601d\u3063\u305f\u304c\u3001\u3000\u5b9f\u306fReact\u3082\u9032\u5316\u3057\u3066\u3044\u305f\u3002 Version\u300016.8\u304b\u3089\u3000Hooks\u3068\u3044\u3046\u6a5f\u80fd\u304c\u8ffd\u52a0\u3055\u308c\u3066\u3000Functional 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