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+---
+title: Math.cosh()
+slug: Web/JavaScript/Reference/Global_Objects/Math/cosh
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/cosh
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>Math.cosh()</code></strong> 函数返回数值的双曲余弦函数, 可用 {{jsxref("Math.E", "constant e", "", 1)}} 表示:</p>
+
+<p><math display="block"><semantics><mrow><mstyle mathvariant="monospace"><mo lspace="0em" rspace="thinmathspace">Math.cosh(x)</mo></mstyle><mo>=</mo><mfrac><mrow><msup><mi>e</mi><mi>x</mi></msup><mo>+</mo><msup><mi>e</mi><mrow><mo>-</mo><mi>x</mi></mrow></msup></mrow><mn>2</mn></mfrac></mrow><annotation encoding="TeX">\mathtt{\operatorname{Math.cosh(x)}} = \frac{e^x + e^{-x}}{2}</annotation></semantics></math></p>
+
+<h2 id="Syntax">Syntax</h2>
+
+<pre class="syntaxbox"><code>Math.cosh(<var>x</var>)</code></pre>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt><code>x</code></dt>
+ <dd>数值.</dd>
+</dl>
+
+<h2 id="描述">描述</h2>
+
+<p>由于<code>cosh()</code> 是Math的静态函数, 只需通过<code>Math.cosh() </code>调用,而不用通过创建Math对象来调用.</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_Math.cosh()">使用 <code>Math.cosh()</code></h3>
+
+<pre class="brush: js">Math.cosh(0);  // 1
+Math.cosh(1);  // 1.5430806348152437
+Math.cosh(-1); // 1.5430806348152437
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<p>可通过 {{jsxref("Math.exp()")}} 函数模拟实现:</p>
+
+<pre class="brush: js">Math.cosh = Math.cosh || function(x) {
+  return (Math.exp(x) + Math.exp(-x)) / 2;
+}
+</pre>
+
+<p>或只调用一次 {{jsxref("Math.exp()")}} 函数:</p>
+
+<pre class="brush: js">Math.cosh = Math.cosh || function(x) {
+  var y = Math.exp(x);
+  return (y + 1 / y) / 2;
+};
+</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.cosh', 'Math.cosh')}}</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>
+
+<div>{{CompatibilityTable}}</div>
+
+<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>{{CompatChrome("38")}}</td>
+   <td>{{CompatGeckoDesktop("25")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatOpera("25")}}</td>
+   <td>{{CompatSafari("7.1")}}</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>8</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{jsxref("Math.acosh()")}} {{experimental_inline}}</li>
+ <li>{{jsxref("Math.asinh()")}} {{experimental_inline}}</li>
+ <li>{{jsxref("Math.atanh()")}} {{experimental_inline}}</li>
+ <li>{{jsxref("Math.sinh()")}} {{experimental_inline}}</li>
+ <li>{{jsxref("Math.tanh()")}} {{experimental_inline}}</li>
+</ul>