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+---
+title: Math.cbrt()
+slug: Web/JavaScript/Reference/Global_Objects/Math/cbrt
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/cbrt
+---
+<div>{{JSRef("Global_Objects", "Math")}}</div>
+
+<h2 id="Summary" name="Summary">概述</h2>
+
+<p><code><strong>Math.cbrt()</strong></code> 函数返回任意数字的立方根.</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox">Math.cbrt(<em>x</em>)</pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>任意数字.</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+
+
+<p>给定数字的立方根</p>
+
+
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p>该方法为Math的静态方法,因此请直接通过Math.cbrt()方式调用.</p>
+
+<p>而不是作为您创建的Math对象的方法(Math不是构造函数)。</p>
+
+<p><span style="font-family: 'Courier New','Andale Mono',monospace; font-weight: inherit; line-height: normal;">cbrt 是 "cube root" 的缩写, 意思是立方根.</span></p>
+
+<h2 id="Examples" name="Examples">示例</h2>
+
+<h3 id="使用_Math.cbrt">使用 Math.cbrt()</h3>
+
+<pre class="brush: js">Math.cbrt(NaN); // NaN
+Math.cbrt(-1); // -1
+Math.cbrt(-0); // -0
+Math.cbrt(-Infinity); // -Infinity
+Math.cbrt(0); // 0
+Math.cbrt(1); // 1
+Math.cbrt(Infinity); // Infinity
+Math.cbrt(null); // 0
+Math.cbrt(2);  // 1.2599210498948734</pre>
+
+<h2 id="Polyfill"><font face="consolas, Liberation Mono, courier, monospace"><span style="background-color: rgba(220, 220, 220, 0.5);">Polyfill</span></font></h2>
+
+<p>为了与旧版浏览器兼容, 可使用下方函数模拟cbrt():</p>
+
+<pre class="brush: js" dir="rtl">if (!Math.cbrt) {
+  Math.cbrt = function(x) {
+    var y = Math.pow(Math.abs(x), 1/3);
+    return x &lt; 0 ? -y : y;
+  };
+}</pre>
+
+<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('ES6', '#sec-math.cbrt', 'Math.cbrt')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<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>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop("25")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<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>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile("25")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+
+
+<h2 id="另请参见">另请参见</h2>
+
+<ul>
+ <li>{{jsxref("Math.pow()")}}</li>
+ <li>{{jsxref("Math.sqrt()")}}</li>
+</ul>