mirror of
https://github.com/fofolee/uTools-Manuals.git
synced 2025-06-09 07:24:04 +08:00
117 lines
5.9 KiB
HTML
117 lines
5.9 KiB
HTML
<article id="wikiArticle">
|
||
<div></div>
|
||
<p><strong><code>Math.asinh()</code></strong> 函数返回给定数字的反双曲正弦值, 即：</p>
|
||
<p><math display="block"><semantics><mrow><mstyle mathvariant="monospace"><mrow><mo lspace="0em" rspace="thinmathspace">Math.asinh</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo></mrow></mstyle><mo>=</mo><mo lspace="0em" rspace="thinmathspace">arsinh</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mo>=</mo><mtext> 特定的 </mtext><mspace width="thickmathspace"></mspace><mi>y</mi><mspace width="thickmathspace"></mspace><mtext>满足</mtext><mspace width="thickmathspace"></mspace><mo lspace="0em" rspace="0em">sinh</mo><mo stretchy="false">(</mo><mi>y</mi><mo stretchy="false">)</mo><mo>=</mo><mi>x</mi></mrow><annotation encoding="TeX">\mathtt{\operatorname{Math.asinh}(x)} = \operatorname{arsinh}(x) = \text{ the unique } \; y \; \text{such that} \; \sinh(y) = x</annotation></semantics></math></p>
|
||
<h2 id="语法">语法</h2>
|
||
<pre><code class="language-javascript"><code>Math.asinh(<var>x</var>)</code></code></pre>
|
||
<h3 id="参数">参数</h3>
|
||
<dl>
|
||
<dt><code>x</code></dt>
|
||
<dd>待计算的数字。</dd>
|
||
</dl>
|
||
<h3 id="返回值">返回值</h3>
|
||
<p>给定数值的反双曲正弦值。</p>
|
||
<h2 id="描述">描述</h2>
|
||
<p><code>由于asinh()是</code><code>Math的静态方法</code>, <code>用户应该直接通过Math.asinh()来使用</code>, 而不是先创建出Math对象再调用该方法（<code>Math</code>不是一个构造器）。</p>
|
||
<h2 id="示例">示例</h2>
|
||
<h3 id="使用Math.asinh()"><code>使用Math.asinh()</code></h3>
|
||
<pre><code class="language-javascript">Math.asinh(1); // 0.881373587019543
|
||
Math.asinh(0); // 0
|
||
</code></pre>
|
||
<h2 id="其他实现方式">其他实现方式</h2>
|
||
<p>由于<math><semantics><mrow><mo lspace="0em" rspace="thinmathspace">arsinh</mo><mo stretchy="false">(</mo><mi>x</mi><mo stretchy="false">)</mo><mo>=</mo><mo lspace="0em" rspace="0em">ln</mo><mrow><mo>(</mo><mrow><mi>x</mi><mo>+</mo><msqrt><mrow><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mn>1</mn></mrow></msqrt></mrow><mo>)</mo></mrow></mrow><annotation encoding="TeX">\operatorname {arsinh} (x) = \ln \left(x + \sqrt{x^{2} + 1} \right)</annotation></semantics></math> ，因此该函数可以被如下的函数所模拟：</p>
|
||
<pre><code class="language-javascript">Math.asinh = Math.asinh || function(x) {
|
||
if (x === -Infinity) {
|
||
return x;
|
||
} else {
|
||
return Math.log(x + Math.sqrt(x * x + 1));
|
||
}
|
||
};
|
||
</code></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><a class="external" href="https://www.ecma-international.org/ecma-262/6.0/#sec-math.asinh" hreflang="en" lang="en" rel="noopener">ECMAScript 2015 (6th Edition, ECMA-262)<br/><small lang="zh-CN">Math.asinh</small></a></td>
|
||
<td><span class="spec-Standard">Standard</span></td>
|
||
<td>Initial definition.</td>
|
||
</tr>
|
||
<tr>
|
||
<td><a class="external" href="https://tc39.github.io/ecma262/#sec-math.asinh" hreflang="en" lang="en" rel="noopener">ECMAScript Latest Draft (ECMA-262)<br/><small lang="zh-CN">Math.asinh</small></a></td>
|
||
<td><span class="spec-Draft">Draft</span></td>
|
||
<td> </td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
<h2 id="浏览器兼容性">浏览器兼容性</h2>
|
||
<div><div class="blockIndicator warning"><strong><a class="external" href="https://github.com/mdn/browser-compat-data" rel="noopener">We're converting our compatibility data into a machine-readable JSON format</a></strong>.
|
||
This compatibility table still uses the old format,
|
||
because we haven't yet converted the data it contains.
|
||
<strong><a class="new" href="/zh-CN/docs/MDN/Contribute/Structures/Compatibility_tables" rel="nofollow">Find out how you can help!</a></strong></div>
|
||
<div class="htab">
|
||
<a id="AutoCompatibilityTable" name="AutoCompatibilityTable"></a>
|
||
<ul>
|
||
<li class="selected"><a>Desktop</a></li>
|
||
<li><a>Mobile</a></li>
|
||
</ul>
|
||
</div></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>38</td>
|
||
<td><a href="/en-US/Firefox/Releases/25" title="Released on 2013-10-29.">25</a> (25)</td>
|
||
<td><span style="color: #f00;">未实现</span></td>
|
||
<td>25</td>
|
||
<td>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><span style="color: #f00;">未实现</span></td>
|
||
<td><span style="color: #f00;">未实现</span></td>
|
||
<td>25.0 (25)</td>
|
||
<td><span style="color: #f00;">未实现</span></td>
|
||
<td><span style="color: #f00;">未实现</span></td>
|
||
<td>8</td>
|
||
</tr>
|
||
</tbody>
|
||
</table>
|
||
</div>
|
||
<h2 id="另见">另见</h2>
|
||
<ul>
|
||
<li><a class="new" href="Reference/Global_Objects/Math/acosh" rel="nofollow" title="此页面仍未被本地化, 期待您的翻译!"><code>Math.acosh()</code></a></li>
|
||
<li><a href="Reference/Global_Objects/Math/atanh" title="Math.atanh() 函数返回一个数值反双曲正切值, 即："><code>Math.atanh()</code></a></li>
|
||
<li><a href="Reference/Global_Objects/Math/cosh" title="Math.cosh() 函数返回数值的双曲余弦函数, 可用 constant e 表示:"><code>Math.cosh()</code></a></li>
|
||
<li><a href="Reference/Global_Objects/Math/sinh" title="Math.sinh() 函数返回一个数字(单位为角度)的双曲正弦值."><code>Math.sinh()</code></a></li>
|
||
<li><a href="Reference/Global_Objects/Math/tanh" title="Math.tanh() 函数将会返回一个数的双曲正切函数值，计算如下:"><code>Math.tanh()</code></a></li>
|
||
</ul>
|
||
</article> |