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---
title: Number.NaN
slug: Web/JavaScript/Reference/Global_Objects/Number/NaN
translation_of: Web/JavaScript/Reference/Global_Objects/Number/NaN
---
<div>{{JSRef("Global_Objects", "Number")}}</div>
<h2 id="Summary" name="Summary">概述</h2>
<p><code><strong>Number.NaN</strong></code> 表示“非数字”（Not-A-Number）。和 {{jsxref("Global_Objects/NaN", "NaN")}} 相同。</p>
<p>不必创建一个 {{jsxref("Global_Objects/Number", "Number")}} 实例来访问该属性，使用 <code>Number.NaN</code> 来访问该静态属性。</p>
<p>{{js_property_attributes(0,0,0)}}</p>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('ES1')}}</td>
<td>{{Spec2('ES1')}}</td>
<td>Initial definition. Implemented in JavaScript 1.1.</td>
</tr>
<tr>
<td>{{SpecName('ES5.1', '#sec-15.7.3.4', 'Number.NaN')}}</td>
<td>{{Spec2('ES5.1')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('ES6', '#sec-number.nan', 'Number.NaN')}}</td>
<td>{{Spec2('ES6')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('ESDraft', '#sec-number.nan', 'Number.NaN')}}</td>
<td>{{Spec2('ESDraft')}}</td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p>{{ CompatibilityTable() }}</p>
<div>
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatVersionUnknown() }}</td>
</tr>
</tbody>
</table>
</div>
<div>
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatVersionUnknown() }}</td>
<td>{{ CompatVersionUnknown() }}</td>
</tr>
</tbody>
</table>
</div>
<h2 id="See_also" name="See_also">相关链接</h2>
<ul>
<li>全局对象 {{jsxref("Global_Objects/NaN", "NaN")}}</li>
<li>{{jsxref("Global_Objects/Number", "Number")}}</li>
</ul>
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