{"json_modified": "2016-03-22T03:51:40.055032", "slug": "Web/JavaScript/Reference/Global_Objects/isNaN", "tags": [], "locale": "it", "title": "isNaN()", "translations": [{"title": "isNaN()", "url": "/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN", "tags": ["JavaScript"], "summary": "The <code><strong>isNaN()</strong></code> function determines whether a value is <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN\" title=\"The global NaN property is a value representing Not-A-Number.\"><code>NaN</code></a> or not. Note: coercion inside the <code>isNaN</code> function has <a href=\"#Description\">interesting</a> rules; you may alternatively want to use <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN\" title=\"The Number.isNaN() method determines whether the passed value is NaN. More robust version of the original global isNaN().\"><code>Number.isNaN()</code></a>, as defined in ECMAScript 6, or you can use <code><a href=\"/en-US/docs/Web/JavaScript/Reference/Operators/typeof\">typeof</a></code> to determine if the value is Not-A-Number.", "localization_tags": [], "locale": "en-US", "last_edit": "2016-01-04T06:45:07", "review_tags": []}, {"title": "isNaN()", "url": "/ja/docs/Web/JavaScript/Reference/Global_Objects/isNaN", "tags": ["JavaScript"], "summary": "<code><strong>isNaN()</strong></code> \u95a2\u6570\u306f\u5f15\u6570\u304c <a href=\"/ja/docs/Web/JavaScript/Reference/Global_Objects/NaN\" title=\"&#x30B0;&#x30ED;&#x30FC;&#x30D0;&#x30EB;&#x30D7;&#x30ED;&#x30D1;&#x30C6;&#x30A3; NaN &#x306F;&#x975E;&#x6570; (Not-A-Number) &#x3092;&#x8868;&#x3059;&#x5024;&#x3067;&#x3059;&#x3002;\"><code>NaN</code></a> <span style=\"color: green;\">\uff08\u975e\u6570\uff09</span>\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3057\u307e\u3059\u3002<code>isNaN</code> \u95a2\u6570\u306e\u578b\u5f37\u5236\u306f<a href=\"#Description\">\u8208\u5473\u6df1\u3044\u30eb\u30fc\u30eb</a>\u3092\u6301\u3064\u3053\u3068\u306b\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u5024\u304c\u975e\u6570\u304b\u3069\u3046\u304b\u3092\u5224\u5b9a\u3059\u308b\u4ee3\u7528\u65b9\u6cd5\u3068\u3057\u3066\u3001ECMAScript 6 \u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b <a href=\"/ja/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN\" title=\"&#x5F15;&#x6570;&#x3068;&#x3057;&#x3066;&#x4E0E;&#x3048;&#x305F;&#x6570;&#x304C;NaN&#x304B;&#x3069;&#x3046;&#x304B;&#x306E;&#x771F;&#x507D;&#x5024;&#x3092;&#x8FD4;&#x3057;&#x307E;&#x3059;&#x3002; &#x30AA;&#x30EA;&#x30B8;&#x30CA;&#x30EB;&#x306E;isNaN()&#x30B0;&#x30ED;&#x30FC;&#x30D0;&#x30EB;&#x30E1;&#x30BD;&#x30C3;&#x30C9;&#x306E;&#x3088;&#x308A;&#x5805;&#x7262;&#x306A;&#x30D0;&#x30FC;&#x30B8;&#x30E7;&#x30F3;&#x3067;&#x3059;&#x3002;\"><code>Number.isNaN()</code></a> \u3084\u00a0<a href=\"/ja/docs/Web/JavaScript/Reference/Operators/typeof\" title=\"typeof &#x6F14;&#x7B97;&#x5B50;&#x306F;&#x3001;&#x8A55;&#x4FA1;&#x3092;&#x884C;&#x308F;&#x308C;&#x306A;&#x3044;&#x307E;&#x307E;&#x306E;&#x72B6;&#x614B;&#x306E;&#x30AA;&#x30DA;&#x30E9;&#x30F3;&#x30C9;&#x306E;&#x30C7;&#x30FC;&#x30BF;&#x578B;&#x3092;&#x793A;&#x3059;&#x6587;&#x5B57;&#x5217;&#x3092;&#x8FD4;&#x3057;&#x307E;&#x3059;&#x3002;\"><code>typeof</code></a> \u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002", "localization_tags": [], "locale": "ja", "last_edit": "2015-11-17T17:55:53", "review_tags": ["technical", "editorial"]}, {"title": "isNaN()", "url": "/fr/docs/Web/JavaScript/Reference/Objets_globaux/isNaN", "tags": ["R\u00e9f\u00e9rence", "JavaScript"], "summary": "\u00c0 la diff\u00e9rence des autres valeurs JavaScript, il est impossible d'utiliser les op\u00e9rateurs d'\u00e9galit\u00e9 faible et stricte (<a href=\"/fr/docs/Web/JavaScript/Reference/Op&#xE9;rateurs/Op&#xE9;rateurs_de_comparaison#.C3.89galit.C3.A9_simple_(.3D.3D)\" title=\"JavaScript poss&#xE8;de des op&#xE9;rateurs de comparaisons stricts et des op&#xE9;rateurs de comparaisons qui effectuent des conversions. Une comparaison strict (ex. : ===) ne sera vraie que si les deux op&#xE9;randes sont du m&#xEA;me type. La comparaison d'&#xE9;galit&#xE9; faible (==) convertira les deux op&#xE9;randes en un m&#xEA;me type avant d'effectuer la comparaison. Pour les comparaisons relationnelles (ex. : &lt;=), les op&#xE9;randes sont tout d'abord converties en valeurs, puis en valeurs du m&#xEA;me type, enfin la comparaison est effectu&#xE9;e.\"><code>==</code></a> et <a href=\"/fr/docs/Web/JavaScript/Reference/Op&#xE9;rateurs/Op&#xE9;rateurs_de_comparaison#.C3.89galit.C3.A9_stricte_(.3D.3D.3D)\" title=\"JavaScript poss&#xE8;de des op&#xE9;rateurs de comparaisons stricts et des op&#xE9;rateurs de comparaisons qui effectuent des conversions. Une comparaison strict (ex. : ===) ne sera vraie que si les deux op&#xE9;randes sont du m&#xEA;me type. La comparaison d'&#xE9;galit&#xE9; faible (==) convertira les deux op&#xE9;randes en un m&#xEA;me type avant d'effectuer la comparaison. Pour les comparaisons relationnelles (ex. : &lt;=), les op&#xE9;randes sont tout d'abord converties en valeurs, puis en valeurs du m&#xEA;me type, enfin la comparaison est effectu&#xE9;e.\"><code>===</code></a>) afin de d\u00e9terminer si une valeur <em>est </em>ou<em> n'est pas</em> r\u00e9ellement <a href=\"/fr/docs/Web/JavaScript/Reference/Objets_globaux/NaN\" title=\"La propri&#xE9;t&#xE9; globale NaN est une valeur utilis&#xE9;e pour repr&#xE9;senter une quantit&#xE9; qui n'est pas un nombre (Not a Number en anglais).\"><code>NaN</code></a>. En effet <code>NaN == NaN</code> et <code>NaN === NaN</code> renvoient <code>false</code> tous les deux. C'est pour cela qu'il est n\u00e9cessaire d'avoir la fonction <code>isNaN()</code>.", "localization_tags": [], "locale": "fr", "last_edit": "2016-01-05T12:10:15", "review_tags": []}, {"title": "isNaN()", "url": "/pl/docs/Web/JavaScript/Referencje/Obiekty/isNaN", "tags": ["JavaScript"], "summary": "Sprawdza, czy argument nie ma warto\u015bci NaN (\"nie-liczba\").", "localization_tags": [], "locale": "pl", "last_edit": "2015-04-25T02:20:29", "review_tags": []}, {"title": "isNaN", "url": "/es/docs/Web/JavaScript/Referencia/Objetos_globales/isNaN", "tags": [], "summary": "Eval\u00faa un argumento para determinar si es un n\u00famero.", "localization_tags": [], "locale": "es", "last_edit": "2014-11-19T12:21:07", "review_tags": []}, {"title": "isNaN", "url": "/ru/docs/Web/JavaScript/Reference/Global_Objects/isNaN", "tags": ["Method", "Functions", "JavaScript"], "summary": "\u0424\u0443\u043d\u043a\u0446\u0438\u044f <code><strong>isNaN()</strong></code> \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0435\u0442 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043b\u0438 \u043b\u0438\u0442\u0435\u0440\u0430\u043b \u0438\u043b\u0438 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u0430\u044f \u043d\u0435 \u0447\u0438\u0441\u043b\u043e\u0432\u044b\u043c \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435\u043c (<a href=\"/ru/docs/Web/JavaScript/Reference/Global_Objects/NaN\" title=\"&#x413;&#x43B;&#x43E;&#x431;&#x430;&#x43B;&#x44C;&#x43D;&#x43E;&#x435; &#x441;&#x432;&#x43E;&#x439;&#x441;&#x442;&#x432;&#x43E; NaN &#x44F;&#x432;&#x43B;&#x44F;&#x435;&#x442;&#x441;&#x44F; &#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;&#x43C;, &#x43F;&#x440;&#x435;&#x434;&#x441;&#x442;&#x430;&#x432;&#x43B;&#x44F;&#x44E;&#x449;&#x438;&#x43C; &#x43D;&#x435;-&#x447;&#x438;&#x441;&#x43B;&#x43E; (Not-A-Number).\"><code>NaN</code></a>) \u0438\u043b\u0438 \u043d\u0435\u0442. \u041f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 \u0441 \u0444\u0443\u043d\u043a\u0446\u0438\u0435\u0439 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u043f\u0440\u043e\u044f\u0432\u043b\u044f\u0442\u044c \u043e\u0441\u0442\u043e\u0440\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0442\u0430\u043a \u043a\u0430\u043a \u043e\u043d\u0430 <a href=\"#Description\">\u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 \u043d\u0435\u043a\u043e\u0440\u0440\u0435\u043a\u0442\u043d\u043e</a>. \u0415\u0441\u043b\u0438 \u0432\u0430\u043c \u0438\u043d\u0442\u0435\u0440\u0435\u0441\u043d\u043e \u043f\u043e\u0434\u0440\u043e\u0431\u043d\u0435\u0435 \u043c\u043e\u0436\u043d\u043e \u043f\u043e\u0441\u043c\u043e\u0442\u0440\u0435\u0442\u044c <a href=\"/ru/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN\" title=\"&#x41C;&#x435;&#x442;&#x43E;&#x434; Number.isNaN() &#x43E;&#x43F;&#x440;&#x435;&#x434;&#x435;&#x43B;&#x44F;&#x435;&#x442;, &#x44F;&#x432;&#x43B;&#x44F;&#x435;&#x442;&#x441;&#x44F; &#x43B;&#x438; &#x43F;&#x435;&#x440;&#x435;&#x434;&#x430;&#x43D;&#x43D;&#x43E;&#x435; &#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435; NaN. &#x42D;&#x442;&#x43E; &#x431;&#x43E;&#x43B;&#x435;&#x435; &#x43D;&#x430;&#x434;&#x451;&#x436;&#x43D;&#x430;&#x44F; &#x432;&#x435;&#x440;&#x441;&#x438;&#x44F; &#x43E;&#x440;&#x438;&#x433;&#x438;&#x43D;&#x430;&#x43B;&#x44C;&#x43D;&#x43E;&#x439; &#x433;&#x43B;&#x43E;&#x431;&#x430;&#x43B;&#x44C;&#x43D;&#x43E;&#x439; &#x444;&#x443;&#x43D;&#x43A;&#x446;&#x438;&#x438; isNaN().\"><code>Number.isNaN()</code></a> \u0442\u043e \u043a\u0430\u043a \u043e\u043d\u0430 \u043e\u043f\u0438\u0441\u0430\u043d\u0430 \u0432 ECMAScript 6, \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u0430\u043b\u044c\u0442\u0435\u0440\u043d\u0430\u0442\u0438\u0432\u043d\u043e\u0433\u043e \u0440\u0435\u0448\u0435\u043d\u0438\u044f \u043c\u043e\u0436\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c <code><a href=\"/en-US/docs/Web/JavaScript/Reference/Operators/typeof\">typeof</a></code> \u0434\u043b\u044f \u043f\u0440\u043e\u0432\u0435\u0440\u043a\u0438 \u043b\u0438\u0442\u0435\u0440\u0430\u043b\u0430 \u0438\u043b\u0438 \u043f\u0435\u0440\u0435\u043c\u0435\u043d\u043d\u043e\u0439 \u043d\u0430 \u043d\u0435 \u0447\u0438\u0441\u043b\u043e\u0432\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435.", "localization_tags": [], "locale": "ru", "last_edit": "2015-12-24T06:05:57", "review_tags": []}, {"title": "isNaN()", "url": "/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/isNaN", "tags": ["JavaScript"], "summary": "A fun\u00e7\u00e3o <code>insNAN ()</code> determina se o valor \u00e9 <a href=\"/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/NaN\" title=\"A propriedade global NaN &#xE9; um valor especial que significa&#xA0;Not-A-Number (n&#xE3;o &#xE9; um n&#xFA;mero).\"><code>NaN</code></a> ou n\u00e3o. Tenha cuidado, essa fun\u00e7\u00e3o \u00e9 quabrada. Voc\u00ea pode ficar interessado no <a href=\"/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN\" title=\"O m&#xE9;todo&#xA0;Number.isNaN() determina se o valor passado &#xE9; NaN. Vers&#xE3;o mais robusta do original global isNaN.\"><code>Number.isNaN()</code></a> que foi definido no ECMAScript 6 ou voc\u00ea pode usar <code>typeof</code> para determinar se o valor \u00e9 Not-A-Number, <code>NaN</code>.", "localization_tags": [], "locale": "pt-BR", "last_edit": "2014-11-19T12:35:12", "review_tags": []}, {"title": "isNaN()", "url": "/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/isNaN", "tags": ["JavaScript"], "summary": "<code><strong>isNaN()</strong></code> \u51fd\u6570\u7528\u6765\u5224\u65ad\u4e00\u4e2a\u503c\u662f\u5426\u4e3a <a href=\"/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/NaN\" title=\"&#x5168;&#x5C40;&#x5C5E;&#x6027; NaN &#x8868;&#x793A; Not-A-Number &#x7684;&#x503C;&#x3002;\"><code>NaN</code></a>\u3002\u6ce8\uff1a<code>isNaN</code>\u51fd\u6570\u5305\u542b\u4e00\u4e9b\u975e\u5e38\u6709\u610f\u601d\u7684\u5f3a\u5236\u8f6c\u6362<a href=\"#Description\">\u89c4\u5219</a>\uff1b\u4f60\u4e5f\u53ef\u4ee5\u901a\u8fc7\u00a0ECMAScript 6 \u4e2d\u5b9a\u4e49\u7684\u00a0<a href=\"/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN\" title=\"Number.isNaN() &#x65B9;&#x6CD5;&#x7528;&#x6765;&#x68C0;&#x6D4B;&#x4F20;&#x5165;&#x7684;&#x503C;&#x662F;&#x5426;&#x662F; NaN&#x3002;&#x8BE5;&#x65B9;&#x6CD5;&#x6BD4;&#x4F20;&#x7EDF;&#x7684;&#x5168;&#x5C40;&#x51FD;&#x6570; isNaN() &#x66F4;&#x53EF;&#x9760;&#x3002;\"><code>Number.isNaN()</code></a> \u6216\u8005\u00a0<code><a href=\"/en-US/docs/Web/JavaScript/Reference/Operators/typeof\">typeof</a></code> \u6765\u5224\u65ad\u4e00\u4e2a\u503c\u662f\u5426\u4e3a\u975e\u6570\u503c\u3002", "localization_tags": ["inprogress"], "locale": "zh-CN", "last_edit": "2016-01-20T19:36:57", "review_tags": []}, {"title": "isNaN()", "url": "/de/docs/Web/JavaScript/Reference/Global_Objects/isNaN", "tags": [], "summary": "Die <code><strong>isNaN()</strong></code> Methode pr\u00fcft, ob ein Wert <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/NaN\" title=\"Die globale NaN Eigenschaft ist ein Wert, der Not-A-Number (keine Zahl) repr&#xE4;sentiert.\"><code>NaN</code></a> ist.<br/>\n Bemerkung: Aufgrund innerer Zw\u00e4nge weist die <code>isNaN</code> Methode <a href=\"#Description\">interessante</a> Regeln auf. Alternativ kann die in ECMAScript 6 definierte Methode <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN\" title=\"Die Number.isNaN() Methode stellt fest, ob ein ihr &#xFC;bergebener Wert NaN ist. Dieses ist eine robustere Version der globalen Methode isNaN()\"><code>Number.isNaN()</code></a> genutzt werden oder man kann mit <code><a href=\"/en-US/docs/Web/JavaScript/Reference/Operators/typeof\">typeof</a></code> feststellen, ob der Wert nicht vom Typ number ist.", "localization_tags": ["inprogress"], "locale": "de", "last_edit": "2015-03-12T07:58:55", "review_tags": ["technical"]}], "modified": "2016-03-22T03:51:38", "label": "isNaN()", "localization_tags": [], "url": "/it/docs/Web/JavaScript/Reference/Global_Objects/isNaN", "last_edit": "2016-03-22T03:51:31", "summary": "La funzione <strong><code>isNaN()</code></strong> determina se un valore \u00e8 <a href=\"/it/docs/Web/JavaScript/Reference/Global_Objects/NaN\" title=\"La propriet&#xE0; globale&#xA0;NaN&#xA0;&#xE8; un valore che rappresenta un non numero&#xA0;(Not-a-Number).\"><code>NaN</code></a> o no.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Summary", "title": "Sommario"}, {"id": "Syntax", "title": "Sintassi"}, {"id": "Parameters", "title": "Parametri"}, {"id": "Description", "title": "Descrizione"}, {"id": "The_necessity_of_an_isNaN_function", "title": "La necessit\u00e0 di una funzione "}, {"id": "Origin_of_NaN_values", "title": "L'origine del valore "}, {"id": "Comportamenti_particolari", "title": "Comportamenti particolari"}, {"id": "Examples", "title": "Esempi"}, {"id": "Specifiche", "title": "Specifiche"}, {"id": "Compatibilit\u00e0_con_i_browser", "title": "Compatibilit\u00e0 con i browser"}, {"id": "See_also", "title": "Vedi anche"}], "id": 146993, "review_tags": ["editorial"]}