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: Number.isFinite()
+slug: Web/JavaScript/Reference/Global_Objects/Number/isFinite
+tags:
+  - JavaScript
+  - Method
+  - Number
+  - Reference
+translation_of: Web/JavaScript/Reference/Global_Objects/Number/isFinite
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>Number.isFinite()</code></strong> 方法會判斷傳入的值是否為有限數（finite number）。</p>
+
+<div>{{EmbedInteractiveExample("pages/js/number-isfinite.html")}}</div>
+
+
+
+<h2 id="語法">語法</h2>
+
+<pre class="syntaxbox">Number.isFinite(v<var>alue</var>)</pre>
+
+<h3 id="參數">參數</h3>
+
+<dl>
+ <dt><code>value</code></dt>
+ <dd>The value to be tested for finiteness.</dd>
+</dl>
+
+<h3 id="回傳值">回傳值</h3>
+
+<p>A {{jsxref("Boolean")}} indicating whether or not the given value is a finite number.</p>
+
+<h2 id="說明">說明</h2>
+
+<p>In comparison to the global {{jsxref("isFinite", "isFinite()")}} function, this method doesn't forcibly convert the parameter to a number. This means only values of the type number, that are also finite, return <code>true</code>.</p>
+
+<h2 id="範例">範例</h2>
+
+<pre class="brush: js">Number.isFinite(Infinity);  // false
+Number.isFinite(NaN);       // false
+Number.isFinite(-Infinity); // false
+
+Number.isFinite(0);         // true
+Number.isFinite(2e64);      // true
+
+Number.isFinite('0');       // false, would've been true with
+                            // global isFinite('0')
+Number.isFinite(null);      // false, would've been true with
+                            // global isFinite(null)
+</pre>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<pre class="brush: js">Number.isFinite = Number.isFinite || function(value) {
+    return typeof value === 'number' &amp;&amp; isFinite(value);
+}
+</pre>
+
+<h2 id="規範">規範</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-number.isfinite', 'Number.isInteger')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-number.isfinite', 'Number.isInteger')}}</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.Number.isFinite")}}</p>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li>The {{jsxref("Number")}} object it belongs to.</li>
+ <li>The global function {{jsxref("isFinite")}}.</li>
+</ul>
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