From 218934fa2ed1c702a6d3923d2aa2cc6b43c48684 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:43:23 -0500
Subject: initial commit

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+---
+title: Math.pow()
+slug: Web/JavaScript/Reference/Global_Objects/Math/pow
+tags:
+  - 次方
+translation_of: Web/JavaScript/Reference/Global_Objects/Math/pow
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>Math.pow()</code></strong> 函式回傳 <code>base</code> 的 <code>exponent</code> 次方（幂）值，也就是 <code>base<sup>exponent</sup></code>。</p>
+
+<h2 id="語法">語法</h2>
+
+<pre class="syntaxbox notranslate"><code>Math.pow(<var>base</var>, <var>exponent</var>)</code></pre>
+
+<h3 id="參數">參數</h3>
+
+<dl>
+ <dt><code>base</code></dt>
+ <dd>基數。</dd>
+ <dt><code>exponent</code></dt>
+ <dd>要乘上 <code>base</code> 幾次的指數。</dd>
+</dl>
+
+<h3 id="回傳值">回傳值</h3>
+
+<p>A number representing the given base taken to the power of the given exponent.</p>
+
+<h2 id="敘述">敘述</h2>
+
+<p>The <strong><code>Math.pow()</code></strong> function returns the <code>base</code> to the <code>exponent</code> power, that is, <code>base<sup>exponent</sup></code>, the base and the exponent are in decimal numeral system.</p>
+
+<p>由於 <code>pow()</code> 是 <code>Math</code> 的靜態方法，you always use it as <code>Math.pow()</code>, rather than as a method of a <code>Math</code> object you created（<code>Math</code> 並沒有建構子）。</p>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="使用_Math.pow">使用 <code>Math.pow()</code></h3>
+
+<pre class="brush: js notranslate">// simple
+Math.pow(7, 2);    // 49
+Math.pow(7, 3);    // 343
+Math.pow(2, 10);   // 1024
+// fractional exponents
+Math.pow(4, 0.5);  // 2 （4 的平方根）
+Math.pow(8, 1/3);  // 2 （8 的立方根）
+Math.pow(2, 0.5);  // 1.4142135623730951 （2 的平方根）
+Math.pow(2, 1/3);  // 1.2599210498948732 （2 的立方根）
+// signed exponents
+Math.pow(7, -2);   // 0.02040816326530612 (1/49)
+Math.pow(8, -1/3); // 0.5
+// signed bases
+Math.pow(-7, 2);   // 49 (負負得正，2次方都是正數)
+Math.pow(-7, 3);   // -343 (3次方有可能為負數)
+Math.pow(-7, 0.5); // NaN (負數沒辦法得出一個實數平方根)
+// due to "even" and "odd" roots laying close to each other,
+// and limits in the floating number precision,
+// negative bases with fractional exponents always return NaN
+Math.pow(-7, 1/3); // NaN
+</pre>
+
+<h2 id="規範">規範</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">規範</th>
+   <th scope="col">狀態</th>
+   <th scope="col">註解</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES1')}}</td>
+   <td>{{Spec2('ES1')}}</td>
+   <td>Initial definition. Implemented in JavaScript 1.0.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES5.1', '#sec-15.8.2.13', 'Math.pow')}}</td>
+   <td>{{Spec2('ES5.1')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-math.pow', 'Math.pow')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-math.pow', 'Math.pow')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="瀏覽器相容性">瀏覽器相容性</h2>
+
+<p class="hidden">The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
+
+<p>{{Compat("javascript.builtins.Math.pow")}}</p>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li>{{jsxref("Math.cbrt()")}}</li>
+ <li>{{jsxref("Math.exp()")}}</li>
+ <li>{{jsxref("Math.log()")}}</li>
+ <li>{{jsxref("Math.sqrt()")}}</li>
+ <li><a href="https://developer.mozilla.org/zh-TW/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators#Exponentiation" title="Arithmetic operators take numerical values (either literals or variables) as their operands and return a single numerical value. The standard arithmetic operators are addition (+), subtraction (-), multiplication (*), and division (/).">Exponentiation operator</a> {{experimental_inline}}</li>
+</ul>
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