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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" style="margin-bottom: 20px; line-height: 30px;">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" style="margin-bottom: 20px; line-height: 30px;">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" style="margin-bottom: 20px; line-height: 30px;">浏览器兼容性</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th style="line-height: 16px;">Feature</th>
+   <th style="line-height: 16px;">Chrome</th>
+   <th style="line-height: 16px;">Firefox (Gecko)</th>
+   <th style="line-height: 16px;">Internet Explorer</th>
+   <th style="line-height: 16px;">Opera</th>
+   <th style="line-height: 16px;">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 id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th style="line-height: 16px;">Feature</th>
+   <th style="line-height: 16px;">Android</th>
+   <th style="line-height: 16px;">Chrome for Android</th>
+   <th style="line-height: 16px;">Firefox Mobile (Gecko)</th>
+   <th style="line-height: 16px;">IE Mobile</th>
+   <th style="line-height: 16px;">Opera Mobile</th>
+   <th style="line-height: 16px;">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" style="margin-bottom: 20px; line-height: 30px;">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>