{"id":38411,"date":"2023-05-03T04:11:50","date_gmt":"2023-11-08T12:50:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react-hooks%e7%b3%bb%e5%88%97%e3%80%91%e8%ae%a9%e6%88%91%e4%bb%ac%e5%92%8cusestate%e6%88%90%e4%b8%ba%e5%a5%bd%e6%9c%8b%e5%8f%8b%e5%90%a7\/"},"modified":"2024-04-30T02:23:32","modified_gmt":"2024-04-29T18:23:32","slug":"%e3%80%90react-hooks%e7%b3%bb%e5%88%97%e3%80%91%e8%ae%a9%e6%88%91%e4%bb%ac%e5%92%8cusestate%e6%88%90%e4%b8%ba%e5%a5%bd%e6%9c%8b%e5%8f%8b%e5%90%a7","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90react-hooks%e7%b3%bb%e5%88%97%e3%80%91%e8%ae%a9%e6%88%91%e4%bb%ac%e5%92%8cusestate%e6%88%90%e4%b8%ba%e5%a5%bd%e6%9c%8b%e5%8f%8b%e5%90%a7\/","title":{"rendered":"\u3010React Hooks\u7cfb\u5217\u3011\u8ba9\u6211\u4eec\u548cuseState()\u6210\u4e3a\u597d\u670b\u53cb\u5427&#8230;!"},"content":{"rendered":"<h2>&#8220;useState() \u662f\u4ec0\u4e48\uff1f&#8221;<\/h2>\n<p>&#8220;\u4f7f\u7528useState\u7684React&#8221;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u8a00\u308f\u305a\u3068\u77e5\u308c\u305f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u72b6\u614b\u3092\u3082\u305f\u305b\u3089\u308c\u308bReact Hooks\u306e\u4e00\u7a2e\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u66f8\u3044\u3066\u3044\u308b\u307b\u307c\u5168\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3067\u4f7f\u308f\u3057\u3066\u3044\u305f\u3060\u3044\u3066\u304a\u308a\u307e\u3059\u304c\u3001useState() \u306e\u3053\u3068\u3082\u3063\u3068\u77e5\u308a\u305f\u3044\u3001\u4ef2\u826f\u304f\u306a\u308a\u305f\u3044\u2026\u30c3\u3068\u601d\u3044\u3001\u6539\u3081\u3066\u8abf\u3079\u3066\u307f\u308b\u3053\u3068\u306b\u3002<\/ul>\n<h3>\u57fa\u672c\u4f7f\u7528\u65b9\u6cd5<\/h3>\n<p>useState()\u3092\u3053\u3046\u3057\u3066\u5f15\u6570\u4ed8\u304d\u3067\u547c\u3073\u3060\u3059\u3068\u3001\u3001\u3001<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">age<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setAge<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">23<\/span><span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>1.\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u72b6\u614b\u3092\u4fdd\u6301\u3059\u308b\u72b6\u614b\u5909\u6570age(\u5f15\u6570\u306b\u6307\u5b9a\u3057\u305f\u5024\u304c\u521d\u671f\u5024\u3068\u3057\u3066\u5165\u308a\u307e\u3059)<\/p>\n<p>2.\u305d\u306e\u72b6\u614b\u5909\u6570\u306b\u5024\u3092\u30bb\u30c3\u30c8\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9setAge (\u4ee5\u964d\u3001\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u306a\u3089\u3063\u3066 setter function \u3068\u547c\u3073\u307e\u3059)<\/p>\n<p>\u3053\u306e\u4e8c\u3064\u3092\u30da\u30a2\u3067\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u306f\u3001\u3053\u3046\u3057\u3066\u5f97\u305f age \u3092\u57cb\u3081\u8fbc\u307f\u3001\u6700\u65b0\u306e\u5024\u3092\u8868\u793a\u3055\u305b\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n\t\t<span class=\"p\">&lt;&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>I'm still <span class=\"si\">{<\/span><span class=\"nx\">age<\/span><span class=\"si\">}<\/span> years old.<span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">handleClick<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>Happy birthday again?<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t<span class=\"p\">&lt;\/&gt;<\/span>\r\n\t<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<p>age\u306e\u5024\u3092\u5909\u5316\u3055\u305b\u308b\u3068\u304d\u3082\u3001useState()\u3067\u7d44\u307f\u3067\u5ba3\u8a00\u3057\u305f setAge (setter function)\u3092\u4f7f\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\">\/\/ age\u306e\u5024\u3092\u5909\u66f4\u3059\u308b\u306b\u306f\u3001age\u3068\u7d44\u307f\u3067\u5ba3\u8a00\u3057\u305fsetAge\u3092\u4f7f\u3044\u307e\u3059<\/span>\r\n\t<span class=\"kd\">function<\/span> <span class=\"nf\">handleClick<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n\t\t<span class=\"nf\">setAge<\/span><span class=\"p\">(<\/span><span class=\"nx\">age<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">age<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u6709\u4ec0\u4e48\u95ee\u9898\u5417\uff1f\u6211\u4eec\u4e0d\u80fd\u4f7f\u7528 setAge \u5417\uff1f\u80fd\u5426\u7528 age += 1 \u66ff\u4ee3\uff1f<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u72b6\u614b\u306e\u5024\u306e\u5909\u66f4\u306f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3092\u884c\u308f\u306a\u3044\u3068\u8868\u793a\u306b\u53cd\u6620\u3055\u308c\u307e\u305b\u3093\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">React\u3067\u306f\u3001setter function\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u304c\u5b9f\u65bd\u3055\u308c\u307e\u3059\u3002age += 1 \u3068\u3001\u666e\u901a\u306b\u5024\u3092\u5909\u66f4\u3057\u305f\u5834\u5408\u306f\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u304c\u8d70\u3089\u306a\u3044\u305f\u3081\u3001\u8868\u793a\u306b\u53cd\u6620\u3055\u308c\u306a\u3044\u3088\u3046\u3067\u3059\u3002<\/ul>\n<h3>\u90a3\u7b2c\u4e8c\u9ede\u8b93\u6211\u5f88\u5728\u610f\u3002\u4e0d\u80fd\u4e0d\u4f7f\u7528useState\u55ce??<\/h3>\n<ul class=\"post-ul\">\u305f\u3068\u3048\u3070\u3053\u3093\u306a\u611f\u3058\u3067\u3001usestate\u3092\u4f7f\u308f\u305a\u306b\u5ba3\u8a00\u3057\u305f\u5909\u6570\u3092\u66f4\u65b0\u3057\u305f\u5834\u5408\u3001\u3001\u3001<\/ul>\n<pre class=\"post-pre\"><code><span class=\"kd\">let<\/span> <span class=\"nx\">age<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">1<\/span>\r\n\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">handleClick<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"nx\">age<\/span> <span class=\"o\">+=<\/span> <span class=\"mi\">1<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n\t<span class=\"p\">&lt;<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>I'm still <span class=\"si\">{<\/span><span class=\"nx\">age<\/span><span class=\"si\">}<\/span> years old!<span class=\"p\">&lt;\/<\/span><span class=\"nt\">div<\/span><span class=\"p\">&gt;<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u72b6\u614b\u306e\u5909\u66f4\u3092React\u304c\u691c\u77e5\u3067\u304d\u306a\u3044\u305f\u3081\u3001\u3053\u308c\u3082\u3084\u306f\u308a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u4e0a\u306b\u5909\u66f4\u304c\u53cd\u6620\u3055\u308c\u307e\u305b\u3093\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">React\u306b\u72b6\u614b\u306e\u5909\u66f4\u3092\u901a\u77e5\u3059\u308b\u305f\u3081\u306b\u306f\u3001useState()\u3067\u751f\u6210\u3057\u305f\u72b6\u614b\u5909\u6570\u3092\u4f7f\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059<\/ul>\n<h3>\u90a3\u4e2a\u4ee4\u4eba\u62c5\u5fc3\u7684\u7b2c3\u70b9\u3002\u5728\u6ca1\u6709React Hooks\u7684\u65f6\u5019\uff0c\u4f60\u662f\u5982\u4f55\u5904\u7406\u7684\u5462\uff1f<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">React version 16.8 \u307e\u3067\u306f\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u3053\u3093\u306a\u611f\u3058\u3067\u66f8\u3044\u3066\u3044\u307e\u3057\u305f\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u30af\u30e9\u30b9\u3067\u8a18\u8f09\u3057\u307e\u3059\u3002<br \/>\n\u72b6\u614b\u306f this.state \u3067\u7ba1\u7406\u3057\u3001\u72b6\u614b\u306e\u5909\u66f4\u306f this.setState() \u3067\u5b9f\u65bd\u3057\u307e\u3059\u3002<\/p>\n<p>useState() \u3092\u4f7f\u3063\u305f\u4eca\u306e\u66f8\u304d\u65b9\u3068\u6bd4\u3079\u308b\u3068\u3001\u72b6\u614b\u5909\u6570\u3068\u305d\u306e\u5909\u66f4\u3092\u3044\u3061\u3044\u3061\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u8a18\u8f09\u3059\u308b\u5fc5\u8981\u304c\u3042\u3063\u305f\u308a\u3001\u5f8c\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u9762\u3067\u3082Hooks\u3092\u4f7f\u3046\u307b\u3046\u304c\u826f\u304b\u3063\u305f\u308a\u3059\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"nx\">React<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">Component<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"kd\">class<\/span> <span class=\"nc\">UserFormClass<\/span> <span class=\"kd\">extends<\/span> <span class=\"nc\">Component<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"nf\">constructor<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">super<\/span><span class=\"p\">(<\/span><span class=\"nx\">props<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span> <span class=\"o\">=<\/span> <span class=\"p\">{<\/span>\r\n      <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"na\">email<\/span><span class=\"p\">:<\/span> <span class=\"dl\">''<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"p\">};<\/span>\r\n  <span class=\"p\">}<\/span>\r\n\r\n  <span class=\"nx\">handleChange<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">event<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"kd\">const<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">name<\/span><span class=\"p\">,<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">}<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">event<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nf\">setState<\/span><span class=\"p\">({<\/span> <span class=\"p\">[<\/span><span class=\"nx\">name<\/span><span class=\"p\">]:<\/span> <span class=\"nx\">value<\/span> <span class=\"p\">});<\/span>\r\n  <span class=\"p\">};<\/span>\r\n\r\n  <span class=\"nx\">handleSubmit<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"nx\">event<\/span><span class=\"p\">)<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nx\">event<\/span><span class=\"p\">.<\/span><span class=\"nf\">preventDefault<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"nx\">console<\/span><span class=\"p\">.<\/span><span class=\"nf\">log<\/span><span class=\"p\">(<\/span><span class=\"dl\">'<\/span><span class=\"s1\">User submitted:<\/span><span class=\"dl\">'<\/span><span class=\"p\">,<\/span> <span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span><span class=\"p\">);<\/span>\r\n  <span class=\"p\">};<\/span>\r\n\r\n  <span class=\"nf\">render<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">form<\/span> <span class=\"na\">onSubmit<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">handleSubmit<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nt\">input<\/span>\r\n          <span class=\"na\">type<\/span><span class=\"p\">=<\/span><span class=\"s\">\"text\"<\/span>\r\n          <span class=\"na\">name<\/span><span class=\"p\">=<\/span><span class=\"s\">\"name\"<\/span>\r\n          <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span><span class=\"si\">}<\/span>\r\n          <span class=\"na\">onChange<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">handleChange<\/span><span class=\"si\">}<\/span>\r\n          <span class=\"na\">placeholder<\/span><span class=\"p\">=<\/span><span class=\"s\">\"Name\"<\/span>\r\n        <span class=\"p\">\/&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nt\">input<\/span>\r\n          <span class=\"na\">type<\/span><span class=\"p\">=<\/span><span class=\"s\">\"email\"<\/span>\r\n          <span class=\"na\">name<\/span><span class=\"p\">=<\/span><span class=\"s\">\"email\"<\/span>\r\n          <span class=\"na\">value<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">state<\/span><span class=\"p\">.<\/span><span class=\"nx\">email<\/span><span class=\"si\">}<\/span>\r\n          <span class=\"na\">onChange<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"k\">this<\/span><span class=\"p\">.<\/span><span class=\"nx\">handleChange<\/span><span class=\"si\">}<\/span>\r\n          <span class=\"na\">placeholder<\/span><span class=\"p\">=<\/span><span class=\"s\">\"Email\"<\/span>\r\n        <span class=\"p\">\/&gt;<\/span>\r\n        <span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">type<\/span><span class=\"p\">=<\/span><span class=\"s\">\"submit\"<\/span><span class=\"p\">&gt;<\/span>Submit<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;\/<\/span><span class=\"nt\">form<\/span><span class=\"p\">&gt;<\/span>\r\n    <span class=\"p\">);<\/span>\r\n  <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"nx\">UserFormClass<\/span><span class=\"p\">;<\/span>\r\n<\/code><\/pre>\n<h3>\u6ce8\u610f\uff1a\u53ef\u4ee5\u5728\u4e0b\u4e00\u6b21\u6e32\u67d3\u4e4b\u540e\u5f15\u7528\u901a\u8fc7setter\u51fd\u6570\u6539\u53d8\u7684\u72b6\u6001<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3067\u3078\u301c\u3068\u304a\u3082\u3063\u305f\u306e\u3067\u8a18\u8f09\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>setNumber\u3067number\u306b5\u3092\u52a0\u7b97\u5f8c\u3001alert\u3067number\u306e\u5024\u3092\u8868\u793a\u3057\u3088\u3046\u3068\u3057\u3066\u307e\u3059\u3002<br \/>\n\u3069\u3046\u306a\u308b\u304b\u3068\u3044\u3046\u3068\u3001\u3001\u3001<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"kd\">function<\/span> <span class=\"nf\">Counter<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"kr\">number<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setNumber<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n\r\n  <span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n    <span class=\"p\">&lt;&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">h1<\/span><span class=\"p\">&gt;<\/span><span class=\"si\">{<\/span><span class=\"kr\">number<\/span><span class=\"si\">}<\/span><span class=\"p\">&lt;\/<\/span><span class=\"nt\">h1<\/span><span class=\"p\">&gt;<\/span>\r\n      <span class=\"p\">&lt;<\/span><span class=\"nt\">button<\/span> <span class=\"na\">onClick<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"p\">()<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">setNumber<\/span><span class=\"p\">(<\/span><span class=\"kr\">number<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">5<\/span><span class=\"p\">);<\/span>\r\n        <span class=\"nf\">alert<\/span><span class=\"p\">(<\/span><span class=\"kr\">number<\/span><span class=\"p\">);<\/span>\r\n      <span class=\"p\">}<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>+5<span class=\"p\">&lt;\/<\/span><span class=\"nt\">button<\/span><span class=\"p\">&gt;<\/span>\r\n    <span class=\"p\">&lt;\/&gt;<\/span>\r\n  <span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u4e0a\u306b\u306f\u5909\u66f4\u5f8c\u306e5\u3092\u8db3\u3057\u305f\u5024\u3067\u6b63\u3057\u304f\u8868\u793a\u3055\u308c\u307e\u3059\u304c\u3001\u30a2\u30e9\u30fc\u30c8\u306b\u306f\u5909\u66f4\u524d\u306e\u307e\u307e\u3067\u8868\u793a\u3055\u308c\u307e\u3059\u3001\u3001\u3001<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u8aad\u3080\u9650\u308a\u3001\u72b6\u614b\u5909\u6570number \u306f\u3001\u53b3\u5bc6\u306b\u306f\u30b3\u30fc\u30c9\u4e0a\u3067\u5024\u304c\u5909\u66f4\u3055\u308c\u308b\u3068\u3044\u3046\u3088\u308a\u3082\u3001React\u5074(\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u5916\u306e\u4e16\u754c)\u3067\u72b6\u614b\u5909\u6570\u3092\u7ba1\u7406\u3057\u3066\u304a\u308a\u3001\u305d\u3061\u3089\u3067\u5909\u66f4\u3055\u308c\u3066\u3044\u308b\u6a21\u69d8\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u5909\u66f4\u3055\u308c\u305f\u72b6\u614b\u5909\u6570\u3092\u5143\u306b\u3001React\u306f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u95a2\u6570\u3092\u518d\u5b9f\u884c(=\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0)\u3057\u3001\u305d\u306e\u5b9f\u884c\u7d50\u679c(\u65b0\u3057\u3044JSX)\u3092DOM\u306b\u53cd\u6620\u3057\u3066\u3044\u308b\u3001\u3068\u3044\u3046\u7406\u89e3\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u5909\u66f4\u5f8c\u306e\u5024\u3092\u308f\u3056\u308f\u3056\u5909\u66f4\u5f8c\u306estate\u304b\u3089\u53d6\u308b\u5fc5\u8981\u3082\u306a\u3044\u306e\u3067\u3001\u5b9f\u88c5\u3059\u308b\u4e0a\u3067\u306f\u7279\u306b\u610f\u8b58\u3059\u308b\u5fc5\u8981\u3082\u306a\u3044\u3067\u3059\u304c\u3001state\u304c\u3069\u3046\u3044\u3046\u3082\u306e\u3067\u3042\u308b\u304b\u3001\u307e\u305f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u63cf\u753b\u306e\u7406\u89e3\u306b\u3082\u306a\u308b\u4e8b\u4f8b\u3060\u3068\u601d\u3044\u307e\u3057\u305f\u3002<\/ul>\n<h3>\u203b \u5173\u4e8e\u91cd\u65b0\u6e32\u67d3\u7684\u4e8b\u9879<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0 = react\u3067\u306f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306f\u3059\u3079\u3066JSX\u3092\u8fd4\u3059\u95a2\u6570\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\u304c\u3001\u305d\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u95a2\u6570\u3092\u6539\u3081\u3066\u5b9f\u884c\u3057\u3001\u5b9f\u884c\u7d50\u679c(JSX)\u3067DOM\u306e\u4e00\u90e8\u3092\u66f4\u65b0\u3059\u308b\u3053\u3068\u3001\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u5b9f\u884c\u306e\u30bf\u30a4\u30df\u30f3\u30b0\u3068\u3057\u3066\u306f\u3001setter function \u3092\u5b9f\u884c\u3057\u305f\u6642\u3084\u3001\u89aa\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3055\u308c\u305f\u6642\u306a\u3069\u306e\u3088\u3046\u3067\u3059\u3002<br \/>\n\u3061\u306a\u307f\u306b\u3053\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3067\u3059\u304c\u3001React\u5185\u3067\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u3001\u3042\u308b\u7a0b\u5ea6\u307e\u3068\u307e\u3063\u305f\u5358\u4f4d\u3067\u30d0\u30c3\u30c1\u51e6\u7406\u3068\u3057\u3066\u8d70\u3063\u3066\u3044\u308b\u307f\u305f\u3044\u3067\u3059\u3002<\/p>\n<h3>\u5f53\u4fee\u6539\u6570\u7ec4\u6216\u5bf9\u8c61\u7684\u503c\u65f6\u8bf7\u6ce8\u610f\u3002<\/h3>\n<p>useState &#8211; React\uff1a\u4f7f\u7528useState\u94a9\u5b50\u51fd\u6570 &#8211; React<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u6700\u521d\u306f\u3053\u308c\u5206\u304b\u3089\u306a\u304f\u3066\u8a70\u307e\u308a\u307e\u3057\u305f\u2026<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">React\u3067\u306f\u72b6\u614b\u5909\u6570\u306f Read-only \u3067\u6271\u308f\u308c\u308b\u306e\u3067\u3001\u914d\u5217\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5024\u3092\u66f4\u65b0\u3057\u305f\u3044\u6642\u306f\u3001\u5024\u305d\u306e\u3082\u306e\u306e\u5909\u66f4\u3067\u306f\u306a\u304f\u3001\u65b0\u3057\u3044\u914d\u5217\u30fb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\u3059\u308b\u66f8\u304d\u65b9\u3067\u3084\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/ul>\n<h3>\u6392\u5217<\/h3>\n<p>\u516c\u5f0f\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306b\u3001state\u306e\u914d\u5217\u64cd\u4f5c\u3059\u308b\u3068\u304d\u306b\u907f\u3051\u308b\u3082\u306e&amp;\u4f7f\u3046\u3079\u304d\u3082\u306e\u304c\u308f\u304b\u308a\u3084\u3059\u304f\u307e\u3068\u307e\u3063\u3066\u3044\u305f\u306e\u3067\u62dd\u501f\u3067\u3059?<\/p>\n<p>\u5de6\u5074\u306e\u5217 (\u914d\u5217\u306e\u5024\u81ea\u4f53\u3092\u5909\u66f4\u3059\u308b(=mutate)) \u3067\u306f\u306a\u304f\u3001\u65b0\u3057\u304f\u914d\u5217\u3092\u751f\u6210\u3067\u304d\u308b(=copy) \u53f3\u5074\u306e\u5217\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d347a37434c4406c6901f\/30-0.png\" alt=\"Untitled.png\" \/><\/div>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u914d\u5217\u306e\u672b\u5c3e\u306b\u8981\u7d20\u3092\u52a0\u3048\u308b(=push())<\/ul>\n<\/li>\n<\/ul>\n<p>\u5143\u306e\u914d\u5217\u3092\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u3067\u3068\u308a\u3001\u65b0\u3057\u3044\u8981\u7d20\u3092\u4e0b\u306b\u8a18\u8f09\u3059\u308b\u65b9\u6cd5<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">setUsers<\/span><span class=\"p\">(<\/span>\r\n\t<span class=\"p\">[<\/span>\r\n\t\t<span class=\"p\">...<\/span><span class=\"nx\">users<\/span><span class=\"p\">,<\/span>\r\n\t\t<span class=\"p\">{<\/span> <span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"nx\">nextId<\/span><span class=\"o\">++<\/span><span class=\"p\">,<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"nx\">name<\/span><span class=\"p\">}<\/span>\r\n\t<span class=\"p\">]<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u914d\u5217\u306e\u5148\u982d\u306b\u8981\u7d20\u3092\u52a0\u3048\u308b(=unshift())<\/ul>\n<\/li>\n<\/ul>\n<p>\u5143\u306e\u914d\u5217\u3092\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u3067\u3068\u308a\u3001\u65b0\u3057\u3044\u8981\u7d20\u3092\u4e0a\u306b\u8a18\u8f09<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">setArtists<\/span><span class=\"p\">(<\/span>\r\n\t<span class=\"p\">[<\/span>\r\n\t\t<span class=\"p\">...<\/span><span class=\"nx\">artists<\/span><span class=\"p\">,<\/span>\r\n\t\t<span class=\"p\">{<\/span> <span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"nx\">nextId<\/span><span class=\"o\">++<\/span><span class=\"p\">,<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"nx\">name<\/span><span class=\"p\">}<\/span>\r\n\t<span class=\"p\">]<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u914d\u5217\u304b\u3089\u8981\u7d20\u3092\u53d6\u308a\u9664\u304f(=pop(), shift(), splice() )<\/ul>\n<\/li>\n<\/ul>\n<p>filter() \u3092\u4f7f\u3046\u65b9\u6cd5(filter() \u306f\u5143\u306e\u914d\u5217\u306f\u5909\u66f4\u305b\u305a\u3001\u65b0\u3057\u3044\u914d\u5217\u3092\u751f\u6210\u3067\u304d\u307e\u3059)<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">setItems<\/span><span class=\"p\">(<\/span>\r\n\t<span class=\"p\">[<\/span>\r\n\t\t<span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nf\">filter<\/span><span class=\"p\">(<\/span><span class=\"nx\">v<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">v<\/span><span class=\"p\">.<\/span><span class=\"nx\">id<\/span> <span class=\"o\">!==<\/span> <span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">id<\/span><span class=\"p\">)<\/span>\t\t\r\n\t<span class=\"p\">]<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u914d\u5217\u306e\u8981\u7d20\u3092\u7f6e\u304d\u63db\u3048\u308b(=splice(), arr[i] = \u2026)<\/ul>\n<\/li>\n<\/ul>\n<p>map() \u3092\u4f7f\u3046\u65b9\u6cd5<br \/>\n\u914d\u5217\u306e\u4e2d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u66f8\u304d\u63db\u3048\u3082\u3001\u3053\u308c\u3067\u5bfe\u5fdc\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">setItems<\/span><span class=\"p\">(<\/span>\r\n\t<span class=\"nx\">items<\/span><span class=\"p\">.<\/span><span class=\"nf\">map<\/span><span class=\"p\">(<\/span><span class=\"nx\">v<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"nx\">v<\/span><span class=\"p\">.<\/span><span class=\"nx\">id<\/span> <span class=\"o\">===<\/span> <span class=\"nx\">item<\/span><span class=\"p\">.<\/span><span class=\"nx\">id<\/span> <span class=\"p\">?<\/span> <span class=\"p\">{<\/span> <span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"nx\">v<\/span><span class=\"p\">.<\/span><span class=\"nx\">id<\/span><span class=\"p\">,<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"\"<\/span> <span class=\"p\">}<\/span> <span class=\"p\">:<\/span> <span class=\"nx\">v<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u914d\u5217\u306b\u8981\u7d20\u3092\u633f\u5165\u3059\u308b(=splice())<\/ul>\n<\/li>\n<\/ul>\n<p>slice() \u3092\u4f7f\u3046\u65b9\u6cd5<br \/>\n\u26a0\ufe0fslice() \u306f\u5143\u306e\u914d\u5217\u3092\u5909\u66f4\u305b\u305a\u65b0\u3057\u3044\u914d\u5217\u3092\u751f\u6210\u3057\u307e\u3059\u304c\u3001splice() \u306f\u5143\u306e\u914d\u5217\u3092\u5909\u66f4\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u3002\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">setShapes<\/span><span class=\"p\">(<\/span>\r\n\t<span class=\"p\">[<\/span>\r\n\t\t<span class=\"p\">...<\/span><span class=\"nx\">shapes<\/span><span class=\"p\">.<\/span><span class=\"nf\">slice<\/span><span class=\"p\">(<\/span><span class=\"mi\">0<\/span><span class=\"p\">,<\/span> <span class=\"nx\">insertAt<\/span><span class=\"p\">),<\/span>\r\n\t\t<span class=\"p\">{<\/span> <span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"nx\">nextId<\/span><span class=\"o\">++<\/span><span class=\"p\">,<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"nx\">shape<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span><span class=\"p\">},<\/span>\r\n\t\t<span class=\"p\">...<\/span><span class=\"nx\">shapes<\/span><span class=\"p\">.<\/span><span class=\"nf\">slice<\/span><span class=\"p\">(<\/span><span class=\"nx\">insertAt<\/span><span class=\"p\">)<\/span>\r\n\t<span class=\"p\">]<\/span>\r\n<span class=\"p\">)<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u914d\u5217\u3092\u30bd\u30fc\u30c8\u3059\u308b(=sort(), reverse())<\/ul>\n<\/li>\n<\/ul>\n<p>\u4e00\u5ea6\u914d\u5217\u3092\u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u3001concat() \u306a\u3069\u3067\u30b3\u30d4\u30fc\u3057\u3066\u304b\u3089\u3001\u30b3\u30d4\u30fc\u3057\u305f\u914d\u5217\u306b\u5bfe\u3057\u3066sort(), reverse() \u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"kd\">function<\/span> <span class=\"nf\">handlerClick<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"kd\">const<\/span> <span class=\"nx\">nextList<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[...<\/span><span class=\"nx\">list<\/span><span class=\"p\">]<\/span>\r\n\t<span class=\"nx\">nextList<\/span><span class=\"p\">.<\/span><span class=\"nf\">reverse<\/span><span class=\"p\">()<\/span>\r\n\t<span class=\"nf\">setList<\/span><span class=\"p\">(<\/span><span class=\"nx\">nextList<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u5bf9\u8c61<\/h3>\n<p>\u914d\u5217\u3068\u540c\u3058\u3067\u3001\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u5909\u66f4\u305b\u305a\u3001\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\u3057\u3066setter function \u306b\u308f\u305f\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u2b55\ufe0f: \u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u4e00\u3064\u4e00\u3064\u8a18\u8f09\u3059\u308b<\/p>\n<p>\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5909\u66f4\u3057\u3066\u3044\u306a\u3044\u305f\u3081\u3001OK<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">setPerson<\/span><span class=\"p\">({<\/span>\r\n\t<span class=\"na\">firstName<\/span><span class=\"p\">:<\/span> <span class=\"nx\">e<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/span><span class=\"p\">,<\/span> <span class=\"c1\">\/\/ \u5909\u66f4\u3057\u305f\u3044\u30d7\u30ed\u30d1\u30c6\u30a3<\/span>\r\n\t<span class=\"na\">lastName<\/span><span class=\"p\">:<\/span> <span class=\"nx\">person<\/span><span class=\"p\">.<\/span><span class=\"nx\">lastName<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"na\">email<\/span><span class=\"p\">:<\/span> <span class=\"nx\">person<\/span><span class=\"p\">.<\/span><span class=\"nx\">email<\/span>\r\n<span class=\"p\">})<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u2b55\ufe0f: \u30b9\u30d7\u30ec\u30c3\u30c9\u69cb\u6587\u3092\u4f7f\u3046<\/ul>\n<\/li>\n<\/ul>\n<p>\u4e0a\u306e\u66f8\u304d\u65b9\u3088\u308a\u3082\u8a18\u8ff0\u91cf\u304c\u6e1b\u3063\u3066\u697d\u3067\u3059?<\/p>\n<pre class=\"post-pre\"><code><span class=\"nf\">setPerson<\/span><span class=\"p\">({<\/span>\r\n\t<span class=\"p\">...<\/span><span class=\"nx\">person<\/span><span class=\"p\">,<\/span>\r\n\t<span class=\"na\">firstname<\/span><span class=\"p\">:<\/span> <span class=\"nx\">e<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/span>\r\n<span class=\"p\">})<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u274c: \u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3092\u66f8\u304d\u63db\u3048\u308b<\/ul>\n<\/li>\n<\/ul>\n<p>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u5909\u66f4\u3055\u308c\u305f\u3053\u3068\u304cReact\u306b\u901a\u77e5\u3055\u308c\u306a\u3044\u305f\u3081\u3001\u30c0\u30e1\u3067\u3059?<\/p>\n<pre class=\"post-pre\"><code><span class=\"nx\">person<\/span><span class=\"p\">.<\/span><span class=\"nx\">person<\/span><span class=\"p\">.<\/span><span class=\"nx\">firstName<\/span> <span class=\"o\">=<\/span> <span class=\"nx\">e<\/span><span class=\"p\">.<\/span><span class=\"nx\">target<\/span><span class=\"p\">.<\/span><span class=\"nx\">value<\/span>\r\n<\/code><\/pre>\n<h2>useState \u7684\u80cc\u540e<\/h2>\n<h3>\u5f53\u6267\u884csetter\u51fd\u6570\u65f6\uff0c\u53d1\u751f\u4e86\u4ec0\u4e48\uff1f<\/h3>\n<p>\u5927\u4f53\u3001\u3053\u3046\u3044\u3046\u6d41\u308c\u3067\u51e6\u7406\u304c\u8d70\u3063\u3066\u3044\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n<p>1.setter function \u306b\u3088\u308b\u3001\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u30c8\u30ea\u30ac\u30fc<\/p>\n<p>2.\u5909\u66f4\u5f8c\u306e\u72b6\u614b\u5909\u6570\u3092\u5143\u306b\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0<\/p>\n<p>3.\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u3057\u305f\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092DOM\u306b\u53cd\u6620<\/p>\n<p>\u3053\u308c\u306b\u95a2\u9023\u3057\u3066\u3001React\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u3082\u307e\u305f\u5225\u306e\u5834\u6240\u3067\u3061\u3087\u3063\u3068\u6df1\u6398\u308a\u3057\u305f\u3044\u3067\u3059\u306d\u2026<\/p>\n<h2>\u63d0\u793a<\/h2>\n<h3>\u6709\u5173initializerFunction\u3002<\/h3>\n<p>useState() \u306e\u5f15\u6570\u306b\u306f\u72b6\u614b\u306e\u521d\u671f\u5024\u3092\u3068\u308c\u307e\u3059\u304c\u3001\u3053\u3053\u306b\u95a2\u6570\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059(=initializer function)<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">import<\/span> <span class=\"p\">{<\/span> <span class=\"nx\">useState<\/span> <span class=\"p\">}<\/span> <span class=\"k\">from<\/span> <span class=\"dl\">'<\/span><span class=\"s1\">react<\/span><span class=\"dl\">'<\/span>\r\n\r\n<span class=\"kd\">function<\/span> <span class=\"nf\">createInitialTodos<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"k\">return<\/span> <span class=\"p\">[<\/span>\r\n\t\t<span class=\"p\">{<\/span><span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">Learn react.<\/span><span class=\"dl\">\"<\/span><span class=\"p\">},<\/span>\r\n\t\t<span class=\"p\">{<\/span><span class=\"na\">id<\/span><span class=\"p\">:<\/span> <span class=\"mi\">2<\/span><span class=\"p\">,<\/span> <span class=\"na\">name<\/span><span class=\"p\">:<\/span> <span class=\"dl\">\"<\/span><span class=\"s2\">Grab a quick lunch.<\/span><span class=\"dl\">\"<\/span><span class=\"p\">},<\/span>\r\n\t<span class=\"p\">]<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">export<\/span> <span class=\"k\">default<\/span> <span class=\"kd\">function<\/span> <span class=\"nf\">TodoList<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n\t<span class=\"kd\">const<\/span> <span class=\"p\">[<\/span><span class=\"nx\">todos<\/span><span class=\"p\">,<\/span> <span class=\"nx\">setTodos<\/span><span class=\"p\">]<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">useState<\/span><span class=\"p\">(<\/span><span class=\"nx\">createInitialTodos<\/span><span class=\"p\">)<\/span>\r\n\r\n\t<span class=\"k\">return <\/span><span class=\"p\">(<\/span>\r\n\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">ul<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t<span class=\"si\">{<\/span><span class=\"nx\">todos<\/span><span class=\"p\">.<\/span><span class=\"nf\">map<\/span><span class=\"p\">(<\/span><span class=\"nx\">v<\/span> <span class=\"o\">=&gt;<\/span> <span class=\"p\">(<\/span>\r\n\t\t\t\t<span class=\"p\">&lt;<\/span><span class=\"nt\">li<\/span> <span class=\"na\">key<\/span><span class=\"p\">=<\/span><span class=\"si\">{<\/span><span class=\"nx\">v<\/span><span class=\"p\">.<\/span><span class=\"nx\">id<\/span><span class=\"si\">}<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t\t\t<span class=\"si\">{<\/span><span class=\"nx\">v<\/span><span class=\"p\">.<\/span><span class=\"nx\">name<\/span><span class=\"si\">}<\/span>\r\n\t\t\t\t<span class=\"p\">&lt;\/<\/span><span class=\"nt\">li<\/span><span class=\"p\">&gt;<\/span>\r\n\t\t\t<span class=\"p\">))<\/span><span class=\"si\">}<\/span>\r\n\t\t<span class=\"p\">&lt;\/<\/span><span class=\"nt\">ul<\/span><span class=\"p\">&gt;<\/span>\r\n\t<span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u521d\u671f\u5316\u6642\u3001 initializer function \u304c\u547c\u3070\u308c\u3001\u305d\u306e\u623b\u308a\u5024\u304c\u72b6\u614b\u306e\u521d\u671f\u5024\u3068\u3057\u3066\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306b\u4fdd\u6301\u3055\u308c\u307e\u3059\u3002(\u4ee5\u964d\u306e\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u6642\u306f\u3001initializer function \u306f\u7121\u8996\u3055\u308c\u307e\u3059\u3002)<\/p>\n<p>\u6307\u5b9a\u3067\u304d\u308b initializer function \u306e\u6761\u4ef6\u306f\u4e0b\u8a18<\/p>\n<p>\u7d14\u7c8b\u95a2\u6570\u3067\u3042\u308b(\u95a2\u6570\u306e\u5916\u90e8\u306e\u72b6\u614b\u3092\u5909\u66f4\u305b\u305a\u3001\u5916\u90e8\u3078\u306e\u5f71\u97ff\u3082\u4e0e\u3048\u306a\u3044)<br \/>\n\u5f15\u6570\u3092\u53d6\u3089\u306a\u3044<br \/>\n\u5024\u3092\u8fd4\u5374\u3059\u308b<\/p>\n<p>\u26a0\ufe0fuseState(createInitialTodos()) \u306e\u3088\u3046\u306b\u3001\u95a2\u6570\u306e\u623b\u308a\u5024\u3001\u5b9f\u884c\u7d50\u679c\u3092\u6307\u5b9a\u3067\u306f\u306a\u304f\u3001useState(createInitialTodos) \u306e\u3088\u3046\u306b\u95a2\u6570\u305d\u306e\u3082\u306e\u3092\u6307\u5b9a\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059<\/p>\n<p>\u305d\u3046\u3057\u306a\u3044\u3068\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u518d\u30ec\u30f3\u30c0\u30ea\u30f3\u30b0\u306e\u305f\u3073\u306b createInitialTodos() \u304c\u5b9f\u884c\u3055\u308c\u3001\u975e\u52b9\u7387\u306a\u3088\u3046\u3067\u3059\u3002<br \/>\n\u521d\u671f\u5024\u306a\u306e\u3067\u3001\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u306e\u521d\u671f\u5316\u6642\u306e\u307f\u306b\u5b9f\u884c\u3055\u308c\u308c\u3070\u3002\u95a2\u6570\u305d\u306e\u3082\u306e\u3092\u6e21\u3057\u3066\u3042\u3052\u308c\u3070\u3001\u521d\u671f\u5316\u6642\u306e\u307f\u306b\u5b9f\u884c\u3055\u308c\u3001\u7121\u99c4\u304c\u306a\u304f\u826f\u3044\u3088\u3046\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&#8220;useState() \u662f\u4ec0\u4e48\uff1f&#8221; &#8220;\u4f7f\u7528useState\u7684React&#038;# [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-38411","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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