From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: Number.isFinite()
+slug: Web/JavaScript/Reference/Global_Objects/Number/isFinite
+tags:
+  - Experimental
+  - JavaScript
+  - Method
+  - Number
+  - Reference
+translation_of: Web/JavaScript/Reference/Global_Objects/Number/isFinite
+---
+<div>{{JSRef}}</div>
+
+<p><strong><code>Number.isFinite()</code></strong> 方法用来检测传入的参数是否是一个有穷数。</p>
+
+<p>{{EmbedInteractiveExample("pages/js/number-isfinite.html")}}</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox notranslate"><code>Number.isFinite(v<var>alue</var>)</code></pre>
+
+<h3 id="Parameters" name="Parameters">参数</h3>
+
+<dl>
+ <dt><code>value</code></dt>
+ <dd>要被检测有穷性的值。</dd>
+</dl>
+
+<h3 id="返回值">返回值</h3>
+
+<p>一个 {{jsxref("Boolean", "布尔值")}} 表示给定的值是否是一个有穷数。</p>
+
+<h2 id="描述">描述</h2>
+
+<p>和全局的 {{jsxref("Global_Objects/isFinite", "isFinite()")}} 函数相比，这个方法不会强制将一个非数值的参数转换成数值，这就意味着，只有数值类型的值，且是有穷的（finite），才返回 <code>true</code>。</p>
+
+<h2 id="Polyfill">Polyfill</h2>
+
+<pre class="brush: js notranslate">if (Number.isFinite === undefined) Number.isFinite = function(value) {
+    return typeof value === 'number' &amp;&amp; isFinite(value);
+}</pre>
+
+<h2 id="示例">示例</h2>
+
+<pre class="brush: js notranslate">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="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范名称</th>
+   <th scope="col">规范状态</th>
+   <th scope="col">备注</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('ES6', '#sec-number.isfinite', 'Number.isInteger')}}</td>
+   <td>{{Spec2('ES6')}}</td>
+   <td></td>
+  </tr>
+  <tr>
+   <td>{{SpecName('ESDraft', '#sec-number.isfinite', 'Number.isInteger')}}</td>
+   <td>{{Spec2('ESDraft')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">浏览器兼容性</h2>
+
+<div>{{Compat("javascript.builtins.Number.isFinite")}}</div>
+
+<h2 id="See_also" name="See_also">相关链接</h2>
+
+<ul>
+ <li>The {{jsxref("Number")}} object it belongs to.</li>
+ <li>The global function {{jsxref("isFinite")}}.</li>
+</ul>
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