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

<p><strong><code>valueOf()</code></strong> 메서드는 {{jsxref("Number")}} 객체가 감싼<sup>wrapped</sup> {{Glossary("primitive", "원시")}} 값을 반환합니다.</p>

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



<h2 id="구문">구문</h2>

<pre class="syntaxbox"><var>numObj</var>.valueOf()</pre>

<h3 id="반환_값">반환 값</h3>

<p>{{jsxref("Number")}} 객체의 원시 값.</p>

<h2 id="설명">설명</h2>

<p><code>valueOf()</code> 메서드는 보통 JavaScript에 의해 내부적으로 호출되고, 웹 코드에서는 명시적으로 호출하지 않습니다.</p>

<h2 id="예제">예제</h2>

<h3 id="valueOf_사용하기"><code>valueOf</code> 사용하기</h3>

<pre class="brush: js">var numObj = new Number(10);
console.log(typeof numObj); // object

var num = numObj.valueOf();
console.log(num);           // 10
console.log(typeof num);    // number
</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('ES1')}}</td>
   <td>{{Spec2('ES1')}}</td>
   <td>Initial definition. Implemented in JavaScript 1.1.</td>
  </tr>
  <tr>
   <td>{{SpecName('ES5.1', '#sec-15.7.4.4', 'Number.prototype.valueOf')}}</td>
   <td>{{Spec2('ES5.1')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('ES6', '#sec-number.prototype.valueof', 'Number.prototype.valueOf')}}</td>
   <td>{{Spec2('ES6')}}</td>
   <td> </td>
  </tr>
  <tr>
   <td>{{SpecName('ESDraft', '#sec-number.prototype.valueof', 'Number.prototype.valueOf')}}</td>
   <td>{{Spec2('ESDraft')}}</td>
   <td> </td>
  </tr>
 </tbody>
</table>

<h2 id="브라우저_호환성">브라우저 호환성</h2>



<p>{{Compat("javascript.builtins.Number.valueOf")}}</p>

<h2 id="같이_보기">같이 보기</h2>

<ul>
 <li>{{jsxref("Number.prototype.toSource()")}}</li>
</ul>