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+---
+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>