{"json_modified": "2016-02-23T04:06:31.570371", "slug": "Web/JavaScript/Reference/Global_Objects/Number/isNaN", "tags": ["Number", "ECMAScript6", "Method", "JavaScript"], "locale": "vi", "title": "Number.isNaN()", "translations": [{"title": "Number.isNaN()", "url": "/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN", "tags": ["Number", "ECMAScript6", "Method", "JavaScript"], "summary": "The <strong><code>Number.isNaN()</code></strong> method determines whether the passed 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>. More robust version of the original global <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/isNaN\" title=\"The isNaN() function determines whether a value is NaN or not. Note: coercion inside the isNaN function has interesting rules; you may alternatively want to use Number.isNaN(), as defined in ECMAScript 6, or you can use typeof to determine if the value is Not-A-Number.\"><code>isNaN()</code></a>.", "localization_tags": [], "locale": "en-US", "last_edit": "2015-12-30T12:49:26", "review_tags": []}, {"title": "Number.isNaN()", "url": "/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN", "tags": ["Experimental", "Number", "Exp\u00e9rimental", "JavaScript", "ECMAScript6", "Method"], "summary": "<strong><code>Number.isNaN()</code></strong> \u65b9\u6cd5\u7528\u6765\u68c0\u6d4b\u4f20\u5165\u7684\u503c\u662f\u5426\u662f <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\u8be5\u65b9\u6cd5\u6bd4\u4f20\u7edf\u7684\u5168\u5c40\u51fd\u6570 <a href=\"/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/isNaN\" title=\"isNaN() &#x51FD;&#x6570;&#x7528;&#x6765;&#x5224;&#x65AD;&#x4E00;&#x4E2A;&#x503C;&#x662F;&#x5426;&#x4E3A; NaN&#x3002;&#x6CE8;&#xFF1A;isNaN&#x51FD;&#x6570;&#x5305;&#x542B;&#x4E00;&#x4E9B;&#x975E;&#x5E38;&#x6709;&#x610F;&#x601D;&#x7684;&#x5F3A;&#x5236;&#x8F6C;&#x6362;&#x89C4;&#x5219;&#xFF1B;&#x4F60;&#x4E5F;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#xA0;ECMAScript 6 &#x4E2D;&#x5B9A;&#x4E49;&#x7684;&#xA0;Number.isNaN() &#x6216;&#x8005;&#xA0;typeof &#x6765;&#x5224;&#x65AD;&#x4E00;&#x4E2A;&#x503C;&#x662F;&#x5426;&#x4E3A;&#x975E;&#x6570;&#x503C;&#x3002;\"><code>isNaN()</code></a> \u66f4\u53ef\u9760\u3002", "localization_tags": [], "locale": "zh-CN", "last_edit": "2015-04-17T07:00:06", "review_tags": []}, {"title": "Number.isNaN()", "url": "/fr/docs/Web/JavaScript/Reference/Objets_globaux/Number/isNaN", "tags": ["polyfill", "R\u00e9f\u00e9rence", "Number", "Exp\u00e9rimental", "JavaScript", "ECMAScript6", "M\u00e9thode"], "summary": "La m\u00e9thode <strong><code>Number.isNaN()</code></strong> permet de d\u00e9terminer si la valeur pass\u00e9e en argument est <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>. Cette version est plus robuste que la m\u00e9thode de l'objet global <a href=\"/fr/docs/Web/JavaScript/Reference/Objets_globaux/isNaN\" title=\"&#xC0; la diff&#xE9;rence des autres valeurs JavaScript, il est impossible d'utiliser les op&#xE9;rateurs d'&#xE9;galit&#xE9; faible et stricte (== et ===) afin de d&#xE9;terminer si une valeur est ou n'est pas r&#xE9;ellement NaN. En effet NaN == NaN et NaN === NaN renvoient false tous les deux. C'est pour cela qu'il est n&#xE9;cessaire d'avoir la fonction isNaN().\"><code>isNaN</code></a>.", "localization_tags": [], "locale": "fr", "last_edit": "2016-01-04T11:17:58", "review_tags": []}, {"title": "Number.isNaN()", "url": "/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN", "tags": ["Number", "Experimental", "Method", "Exp\u00e9rimental", "JavaScript"], "summary": "O m\u00e9todo\u00a0<strong><code>Number.isNaN()</code></strong> determina se o valor passado \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>. Vers\u00e3o mais robusta do original global <a href=\"/pt-BR/docs/Web/JavaScript/Reference/Global_Objects/isNaN\" title=\"A fun&#xE7;&#xE3;o insNAN () determina se o valor &#xE9; NaN ou n&#xE3;o. Tenha cuidado, essa fun&#xE7;&#xE3;o &#xE9; quabrada. Voc&#xEA; pode ficar interessado no Number.isNaN() que foi definido no ECMAScript 6 ou voc&#xEA; pode usar typeof para determinar se o valor &#xE9; Not-A-Number, NaN.\"><code>isNaN</code></a>.", "localization_tags": ["inprogress"], "locale": "pt-BR", "last_edit": "2014-09-04T23:14:51", "review_tags": []}, {"title": "Number.isNaN()", "url": "/ru/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN", "tags": ["polyfill", "R\u00e9f\u00e9rence", "Reference", "Experimental", "Number", "Exp\u00e9rimental", "JavaScript", "ECMAScript6", "Method"], "summary": "\u041c\u0435\u0442\u043e\u0434 <strong><code>Number.isNaN()</code></strong> \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u044f\u0435\u0442, \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043b\u0438 \u043f\u0435\u0440\u0435\u0434\u0430\u043d\u043d\u043e\u0435 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 <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>. \u042d\u0442\u043e \u0431\u043e\u043b\u0435\u0435 \u043d\u0430\u0434\u0451\u0436\u043d\u0430\u044f \u0432\u0435\u0440\u0441\u0438\u044f \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b\u044c\u043d\u043e\u0439 \u0433\u043b\u043e\u0431\u0430\u043b\u044c\u043d\u043e\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 <a href=\"/ru/docs/Web/JavaScript/Reference/Global_Objects/isNaN\" title=\"&#x424;&#x443;&#x43D;&#x43A;&#x446;&#x438;&#x44F; isNaN() &#x43E;&#x43F;&#x440;&#x435;&#x434;&#x435;&#x43B;&#x44F;&#x435;&#x442; &#x44F;&#x432;&#x43B;&#x44F;&#x435;&#x442;&#x441;&#x44F; &#x43B;&#x438; &#x43B;&#x438;&#x442;&#x435;&#x440;&#x430;&#x43B; &#x438;&#x43B;&#x438; &#x43F;&#x435;&#x440;&#x435;&#x43C;&#x435;&#x43D;&#x43D;&#x430;&#x44F; &#x43D;&#x435; &#x447;&#x438;&#x441;&#x43B;&#x43E;&#x432;&#x44B;&#x43C; &#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;&#x43C; (NaN) &#x438;&#x43B;&#x438; &#x43D;&#x435;&#x442;. &#x41F;&#x440;&#x438; &#x440;&#x430;&#x431;&#x43E;&#x442;&#x435; &#x441; &#x444;&#x443;&#x43D;&#x43A;&#x446;&#x438;&#x435;&#x439; &#x43D;&#x435;&#x43E;&#x431;&#x445;&#x43E;&#x434;&#x438;&#x43C;&#x43E; &#x43F;&#x440;&#x43E;&#x44F;&#x432;&#x43B;&#x44F;&#x442;&#x44C; &#x43E;&#x441;&#x442;&#x43E;&#x440;&#x43E;&#x436;&#x43D;&#x43E;&#x441;&#x442;&#x44C; &#x442;&#x430;&#x43A; &#x43A;&#x430;&#x43A; &#x43E;&#x43D;&#x430; &#x440;&#x430;&#x431;&#x43E;&#x442;&#x430;&#x435;&#x442; &#x43D;&#x435;&#x43A;&#x43E;&#x440;&#x440;&#x435;&#x43A;&#x442;&#x43D;&#x43E;. &#x415;&#x441;&#x43B;&#x438; &#x432;&#x430;&#x43C; &#x438;&#x43D;&#x442;&#x435;&#x440;&#x435;&#x441;&#x43D;&#x43E; &#x43F;&#x43E;&#x434;&#x440;&#x43E;&#x431;&#x43D;&#x435;&#x435; &#x43C;&#x43E;&#x436;&#x43D;&#x43E; &#x43F;&#x43E;&#x441;&#x43C;&#x43E;&#x442;&#x440;&#x435;&#x442;&#x44C; Number.isNaN() &#x442;&#x43E; &#x43A;&#x430;&#x43A; &#x43E;&#x43D;&#x430; &#x43E;&#x43F;&#x438;&#x441;&#x430;&#x43D;&#x430; &#x432; ECMAScript 6, &#x432; &#x43A;&#x430;&#x447;&#x435;&#x441;&#x442;&#x432;&#x435; &#x430;&#x43B;&#x44C;&#x442;&#x435;&#x440;&#x43D;&#x430;&#x442;&#x438;&#x432;&#x43D;&#x43E;&#x433;&#x43E; &#x440;&#x435;&#x448;&#x435;&#x43D;&#x438;&#x44F; &#x43C;&#x43E;&#x436;&#x43D;&#x43E; &#x438;&#x441;&#x43F;&#x43E;&#x43B;&#x44C;&#x437;&#x43E;&#x432;&#x430;&#x442;&#x44C; typeof &#x434;&#x43B;&#x44F; &#x43F;&#x440;&#x43E;&#x432;&#x435;&#x440;&#x43A;&#x438; &#x43B;&#x438;&#x442;&#x435;&#x440;&#x430;&#x43B;&#x430; &#x438;&#x43B;&#x438; &#x43F;&#x435;&#x440;&#x435;&#x43C;&#x435;&#x43D;&#x43D;&#x43E;&#x439; &#x43D;&#x430; &#x43D;&#x435; &#x447;&#x438;&#x441;&#x43B;&#x43E;&#x432;&#x43E;&#x435; &#x437;&#x43D;&#x430;&#x447;&#x435;&#x43D;&#x438;&#x435;.\"><code>isNaN()</code></a>.", "localization_tags": [], "locale": "ru", "last_edit": "2015-01-28T21:41:26", "review_tags": []}, {"title": "Number.isNaN()", "url": "/de/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN", "tags": ["Experimental", "Number", "Exp\u00e9rimental", "JavaScript", "ECMAScript6", "Method"], "summary": "Die <strong><code>Number.isNaN()</code></strong> Methode stellt fest, ob ein ihr \u00fcbergebener 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. Dieses ist eine robustere Version der globalen Methode <a href=\"/de/docs/Web/JavaScript/Reference/Global_Objects/isNaN\" title=\"Die isNaN() Methode pr&#xFC;ft, ob ein Wert NaN ist.&#10; Bemerkung: Aufgrund innerer Zw&#xE4;nge weist die isNaN Methode interessante Regeln auf. Alternativ kann die in ECMAScript 6 definierte Methode Number.isNaN() genutzt werden oder man kann mit typeof feststellen, ob der Wert nicht vom Typ number ist.\"><code>isNaN()</code></a>", "localization_tags": [], "locale": "de", "last_edit": "2015-07-24T01:21:02", "review_tags": []}, {"title": "Number.isNaN()", "url": "/ja/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN", "tags": ["Experimental", "Number", "Exp\u00e9rimental", "JavaScript", "ECMAScript6", "Method"], "summary": "\u5f15\u6570\u3068\u3057\u3066\u4e0e\u3048\u305f\u6570\u304c<a href=\"/ja/docs/Web/JavaScript/Reference/Global_Objects/NaN\" title=\"&#x975E;&#x6570; (Not-A-Number) &#x3092;&#x8868;&#x3059;&#x5024;&#x3002;\"><code>NaN</code></a>\u304b\u3069\u3046\u304b\u306e\u771f\u507d\u5024\u3092\u8fd4\u3057\u307e\u3059\u3002 \u30aa\u30ea\u30b8\u30ca\u30eb\u306e<a href=\"/ja/docs/Web/JavaScript/Reference/Global_Objects/isNaN\" title=\"&#x5F15;&#x6570;&#x304C;&#x6570;&#x3067;&#x306A;&#x3044;&#x304B;&#x3069;&#x3046;&#x304B;&#x3092;&#x8A55;&#x4FA1;&#x3057;&#x307E;&#x3059;&#x3002;\"><code>isNaN()</code></a>\u30b0\u30ed\u30fc\u30d0\u30eb\u30e1\u30bd\u30c3\u30c9\u306e\u3088\u308a\u5805\u7262\u306a\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u3059\u3002", "localization_tags": ["inprogress"], "locale": "ja", "last_edit": "2015-06-21T08:01:59", "review_tags": ["editorial"]}, {"title": "Number.isNaN()", "url": "/ca/docs/Web/JavaScript/Referencia/Objectes_globals/Number/isNaN", "tags": [], "summary": "El m\u00e8tode <strong><code>Number.isNaN()</code></strong> determina si el valor passat com a argument \u00e9s <a href=\"/ca/docs/Web/JavaScript/Referencia/Global_Objects/NaN\" title=\"Aquesta p&#xE0;gina encara no ha estat tradu&#xEF;da. Si us plau considera contribuir-hi!\"><code>NaN</code></a>. \u00c9s una versi\u00f3 m\u00e9s robusta de la funci\u00f3 global <a href=\"/ca/docs/Web/JavaScript/Referencia/Global_Objects/isNaN\" title=\"Aquesta p&#xE0;gina encara no ha estat tradu&#xEF;da. Si us plau considera contribuir-hi!\"><code>isNaN()</code></a>.", "localization_tags": [], "locale": "ca", "last_edit": "2015-08-01T12:28:29", "review_tags": []}, {"title": "Number.isNaN()", "url": "/pt-PT/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN", "tags": ["Experimental", "Number", "JavaScript", "ECMAScript6", "M\u00e9todo", "Method"], "summary": "O m\u00e9todo\u00a0<strong><code>Number.isNaN()</code></strong> determina se o valor passado \u00e9\u00a0<a href=\"/pt-PT/docs/Web/JavaScript/Reference/Global_Objects/NaN\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>NaN</code></a>. Esta \u00e9 uma vers\u00e3o mais robusta que\u00a0<a href=\"/pt-PT/docs/Web/JavaScript/Reference/Global_Objects/isNaN\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>isNaN()</code></a>.", "localization_tags": ["inprogress"], "locale": "pt-PT", "last_edit": "2015-08-22T07:35:25", "review_tags": []}, {"title": "Number.isNaN()", "url": "/es/docs/Web/JavaScript/Referencia/Objetos_globales/Number/isNaN", "tags": [], "summary": "El m\u00e9todo <strong><code>Number.isNaN()</code></strong> determina si el valor pasado es <a href=\"/es/docs/Web/JavaScript/Referencia/Objetos_globales/NaN\" title=\"Un valor representando un Not-A-Number (No es Un N&#xFA;mero).\"><code>NaN</code></a>. Versi\u00f3n m\u00e1s robusta de la funci\u00f3n global <a href=\"/es/docs/Web/JavaScript/Referencia/Objetos_globales/isNaN\" title=\"Eval&#xFA;a un argumento para determinar si es un n&#xFA;mero.\"><code>isNaN()</code></a>.", "localization_tags": [], "locale": "es", "last_edit": "2016-01-18T12:06:31", "review_tags": []}], "modified": "2016-02-23T04:06:29", "label": "Number.isNaN()", "localization_tags": [], "url": "/vi/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN", "last_edit": "2016-02-23T04:06:25", "summary": "Ph\u01b0\u01a1ng th\u1ee9c\u00a0<strong><code>Number.isNaN()</code></strong>\u00a0(NaN vi\u1ebft t\u1eaft cho Not a Number)\u00a0x\u00e1c \u0111\u1ecbnh xem gi\u00e1 tr\u1ecb \u0111\u00f3 c\u00f3 <em><strong>ch\u00ednh x\u00e1c</strong></em>\u00a0l\u00e0\u00a0<a href=\"/vi/docs/Web/JavaScript/Reference/NaN\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>NaN</code></a> hay kh\u00f4ng. M\u1ed9t phi\u00ean b\u1ea3n kh\u00e1c c\u1ee7a ph\u01b0\u01a1ng th\u1ee9c n\u00e0y, nh\u01b0ng n\u1eb1m trong ph\u1ea1m vi global \u0111\u00f3 l\u00e0:\u00a0<a href=\"/vi/docs/Web/JavaScript/Reference/isNaN\" title=\"The documentation about this has not yet been written; please consider contributing!\"><code>isNaN()</code></a>.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Parameters", "title": "Parameters"}, {"id": "Description", "title": "Description"}, {"id": "Examples", "title": "Examples"}, {"id": "Polyfill", "title": "Polyfill"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "See_also", "title": "See also"}], "id": 177232, "review_tags": []}