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+---
+title: isNaN 函數
+slug: Web/JavaScript/Obsolete_Pages/Obsolete_Pages/Obsolete_Pages/預先定義的函數/isNaN_函數
+translation_of: Web/JavaScript/Guide/Functions
+translation_of_original: Web/JavaScript/Guide/Obsolete_Pages/Predefined_Functions/isNaN_Function
+---
+<p> </p>
+<div class="onlyinclude">
+<h4 id="isNaN_函數">isNaN 函數</h4>
+<p><code>isNaN</code> 函數對參數求值，來判斷是不是〝NaN〞（不是數字，not a number）。<code>isNaN</code> 的語句如下︰</p>
+<pre>isNaN(testValue)
+</pre>
+<p>此處的 <code>testValue</code> 就是你想要求值的值。</p>
+<p><code>parseFloat</code> 和 <code>parseInt</code> 函數會在求出來的值不是數字的時候返回〝NaN〞<span style="font-family: monospace;">。</span>如果傳入的是〝NaN〞，<code>isNaN</code> 返回 true，否則為 false。</p>
+<p>以下的代碼會對 <code>floatValue</code> 求值，來判斷這是不是數字，然後呼叫相應的程序︰</p>
+<pre>floatValue=parseFloat(toFloat)
+
+if (isNaN(floatValue)) {
+   notFloat()
+} else {
+   isFloat()
+}
+</pre>
+</div>
+<p>{{ PreviousNext("Core_JavaScript_1.5_教學:預先定義的函數:isFinite_函數", "Core_JavaScript_1.5_教學:預先定義的函數:parseInt_和_parseFloat_函數") }}</p>
+<p>{{ languages( { "en": "en/Core_JavaScript_1.5_Guide/Predefined_Functions/isNaN_Function", "fr": "fr/Guide_JavaScript_1.5/Fonctions_pr\u00e9d\u00e9finies/La_fonction_isNaN", "ja": "ja/Core_JavaScript_1.5_Guide/Predefined_Functions/isNaN_Function", "pl": "pl/Przewodnik_po_j\u0119zyku_JavaScript_1.5/Funkcje_predefiniowane/Funkcja_isNaN" } ) }}</p>