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+---
+title: Math.sqrt()
+slug: Web/JavaScript/Reference/Global_Objects/Math/sqrt
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/sqrt
+---
+<div>{{JSRef}}</div>
+
+<p><code><strong>Math.sqrt()</strong></code> 函数返回一个数的平方根，即：</p>
+
+<p><math display="block"><semantics><mrow><mo>∀</mo><mi>x</mi><mo>≥</mo><mn>0</mn><mo>,</mo><mstyle mathvariant="monospace"><mrow><mi>M</mi><mi>a</mi><mi>t</mi><mi>h</mi><mo>.</mo><mi>s</mi><mi>q</mi><mi>r</mi><mi>t</mi><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></mrow></mstyle><mo>=</mo><msqrt><mi>x</mi></msqrt><mo>=</mo><mtext>the unique</mtext><mspace width="thickmathspace"></mspace><mi>y</mi><mo>≥</mo><mn>0</mn><mspace width="thickmathspace"></mspace><mtext>such that</mtext><mspace width="thickmathspace"></mspace><msup><mi>y</mi><mn>2</mn></msup><mo>=</mo><mi>x</mi></mrow><annotation encoding="TeX">\forall x \geq 0, \mathtt{Math.sqrt(x)} = \sqrt{x} = \text{the unique} \; y \geq 0 \; \text{such that} \; y^2 = x</annotation></semantics></math></p>
+
+<p>{{EmbedInteractiveExample("pages/js/math-sqrt.html")}}</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><code>Math.sqrt(<em>x</em>) </code></pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>一个数值</dd>
+</dl>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p>如果参数 <code>number</code> 为负值，则 <code>sqrt</code> 返回{{jsxref("NaN")}}。</p>
+
+<p>由于 <code>sqrt</code> 是 <code>Math</code> 的静态方法，所以应该像这样使用：<code>Math.sqrt()</code>，而不是作为你创建的 <code>Math</code> 实例的方法。</p>
+
+<h2 id="Examples" name="Examples">示例</h2>
+
+<h3 id="Example_Using_Math.sqrt" name="Example:_Using_Math.sqrt">使用 <code>Math.sqrt</code></h3>
+
+<pre><code>Math.sqrt(9); // 3
+Math.sqrt(2); // 1.414213562373095
+
+Math.sqrt(1);  // 1
+Math.sqrt(0);  // 0
+Math.sqrt(-1); // NaN
+Math.sqrt(-0); // -0</code></pre>
+
+<h2 id="规范">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-15.8.2.17', 'Math.sqrt')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-math.sqrt', 'Math.sqrt')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{Compat("javascript.builtins.Math.sqrt")}}</p>
+
+<h2 id="参见">参见</h2>
+
+<ul>
+ <li>{{jsxref("Math.cbrt()")}}</li>
+ <li>{{jsxref("Math.exp()")}}</li>
+ <li>{{jsxref("Math.log()")}}</li>
+ <li>{{jsxref("Math.pow()")}}</li>
+</ul>