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+---
+title: Math.SQRT2
+slug: Web/JavaScript/Reference/Global_Objects/Math/SQRT2
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/SQRT2
+---
+<p>{{JSRef("Global_Objects", "Math")}}</p>
+<h2 id="Summary" name="Summary">概述</h2>
+<p><code><strong>Math.SQRT2</strong></code> 属性表示 2 的平方根，约为 1.414：</p>
+<h2 id="Description" name="Description">描述</h2>
+<p>由于 <code>SQRT2</code> 是 <code>Math</code> 的静态属性，所以应该像这样使用：<code>Math.SQRT2</code>，而不是作为你创建的 <code>Math</code> 实例的属性（<code>Math</code> 不是构造函数）。</p>
+<h2 id="Examples" name="Examples">示例</h2>
+<h3 id="Example:_Using_Math.SQRT2" name="Example:_Using_Math.SQRT2">例子：使用 <code>Math.SQRT2</code></h3>
+<p>下面的函数返回 2 的平方根：</p>
+<pre class="brush:js">function getRoot2() {
+   return Math.SQRT2;
+}
+
+getRoot2(); // 1.4142135623730951</pre>
+<h2 id="规范" style="margin-bottom: 20px; line-height: 30px;">规范</h2>
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范版本</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">注解</th>
+  </tr>
+  <tr>
+   <td>ECMAScript 1st Edition. Implemented in JavaScript 1.0</td>
+   <td>Standard</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.8.1.8', 'Math.SQRT2')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-math.sqrt2', 'Math.SQRT2')}}</td>
+   <td>{{Spec2('ES6')}}</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>The {{jsxref("Global_Objects/Math", "Math")}} object it belongs to.</li>
+</ul>
+<p></p>