---
title: Number.isInteger()
slug: Web/JavaScript/Reference/Global_Objects/Number/isInteger
tags:
  - JavaScript
  - Method
  - Number
  - Reference
translation_of: Web/JavaScript/Reference/Global_Objects/Number/isInteger
---
<div>{{JSRef}}</div>

<p><strong><code>Number.isInteger()</code> </strong>메서드는 주어진 값이 정수인지 판별합니다.</p>

<div>{{EmbedInteractiveExample("pages/js/number-isinteger.html")}}</div>



<h2 id="구문">구문</h2>

<pre class="syntaxbox">Number.isInteger(v<var>alue</var>)</pre>

<h3 id="매개변수">매개변수</h3>

<dl>
 <dt><code>value</code></dt>
 <dd>정수인지 확인하려는 값.</dd>
</dl>

<h3 id="반환_값">반환 값</h3>

<p>주어진 값의 정수 여부를 나타내는 {{jsxref("Boolean")}}.</p>

<h2 id="설명">설명</h2>

<p>매개변수의 값이 정수면 <code>true</code>를, 아니면 <code>false</code>를 반환합니다. 값이 {{jsxref("NaN")}}이거나 {{jsxref("Infinity")}}여도 <code>false</code>를 반환합니다.</p>

<h2 id="예제">예제</h2>

<pre>Number.isInteger(0);         // true
Number.isInteger(1);         // true
Number.isInteger(-100000);   // true
Number.isInteger(99999999999999999999999); // true

Number.isInteger(0.1);       // false
Number.isInteger(Math.PI);   // false

Number.isInteger(NaN);       // false
Number.isInteger(Infinity);  // false
Number.isInteger(-Infinity); // false
Number.isInteger('10');      // false
Number.isInteger(true);      // false
Number.isInteger(false);     // false
Number.isInteger([1]);       // false
</pre>

<h2 id="폴리필">폴리필</h2>

<pre class="brush: js">Number.isInteger = Number.isInteger || function(value) {
  return typeof value === "number" &amp;&amp;
    isFinite(value) &amp;&amp;
    Math.floor(value) === value;
};
</pre>

<h2 id="명세">명세</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.isinteger', 'Number.isInteger')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td>Initial definition.</td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-number.isinteger', 'Number.isInteger')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="브라우저_호환성">브라우저 호환성</h2>

<div>{{Compat("javascript.builtins.Number.isInteger")}}</div>

<h2 id="같이_보기">같이 보기</h2>

<ul>
 <li>메서드가 속한 {{jsxref("Number")}} 객체.</li>
</ul>