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+---
+title: Math.sin()
+slug: Web/JavaScript/Reference/Global_Objects/Math/sin
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/sin
+---
+<div>{{JSRef("Global_Objects", "Math")}}</div>
+
+<h2 id="Summary" name="Summary">概述</h2>
+
+<p><code><strong>Math.sin()</strong></code> 函数返回一个数值的正弦值。</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox notranslate">Math.sin(<em>x</em>)</pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>一个数值（以弧度为单位）。</dd>
+</dl>
+
+<h2 id="Description" name="Description">描述</h2>
+
+<p><code>sin</code> 方法返回一个 -1 到 1 之间的数值，表示给定角度（单位：弧度）的正弦值。</p>
+
+<p>由于 <code>sin</code> 是 <code>Math</code> 的静态方法，所以应该像这样使用：<code>Math.sin()</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.sin" name="Example:_Using_Math.sin">例子：使用 <code>Math.sin</code></h3>
+
+<pre class="brush:js notranslate">Math.sin(0);           // 0
+Math.sin(1);           // 0.8414709848078965
+
+Math.sin(Math.PI / 2); // 1</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-15.8.2.16', 'Math.sin')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-math.sin', 'Math.sin')}}</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.sin") }}</p>
+
+<div id="compat-desktop"></div>
+
+<h2 id="See_also" name="See_also">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Math.acos()")}}</li>
+ <li>{{jsxref("Math.asin()")}}</li>
+ <li>{{jsxref("Math.atan()")}}</li>
+ <li>{{jsxref("Math.atan2()")}}</li>
+ <li>{{jsxref("Math.cos()")}}</li>
+ <li>{{jsxref("Math.tan()")}}</li>
+</ul>