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---
title: Boolean.prototype
slug: conflicting/Web/JavaScript/Reference/Global_Objects/Boolean
tags:
- Boolean
- JavaScript
- Property
- Prototype
translation_of: Web/JavaScript/Reference/Global_Objects/Boolean
translation_of_original: Web/JavaScript/Reference/Global_Objects/Boolean/prototype
original_slug: Web/JavaScript/Reference/Global_Objects/Boolean/prototype
---
<p>{{JSRef}}</p>
<p><strong><code>Boolean.prototype</code></strong> 属性表示{{jsxref("Boolean")}} 构造函数的原型。</p>
<div>{{js_property_attributes(0,0,0)}}</div>
<h2 id="Description" name="Description" style="margin-bottom: 20px; line-height: 30px;">描述</h2>
<p>{{jsxref("Boolean")}}实例继承自<code>Boolean.prototype</code>。你可以使用构造函数的原型对象向所有{{jsxref("Boolean")}}实例添加属性或方法。</p>
<h2 id="属性" style="margin-bottom: 20px; line-height: 30px;">属性</h2>
<dl>
<dt><code>Boolean.prototype.constructor</code></dt>
<dd>返回创建了实例原型的函数。默认为{{jsxref("Boolean")}}函数。</dd>
</dl>
<h2 id="方法" style="margin-bottom: 20px; line-height: 30px;">方法</h2>
<dl>
<dt>{{jsxref("Boolean.prototype.toSource()")}} {{ Non-standard_inline() }}</dt>
<dd>返回包含{{jsxref("Boolean")}}对象源码的字符串；你可以使用这个字符串来创建一个等价的对象。覆盖了{{jsxref("Object.prototype.toSource()")}} 方法。</dd>
<dt>{{jsxref("Boolean.prototype.toString()")}}</dt>
<dd>根据对象的值来返回一个字符串：<code>"true"</code> 或 <code>"false"</code>。覆盖了 {{jsxref("Object.prototype.toString()")}} 方法。</dd>
<dt>{{jsxref("Boolean.prototype.valueOf()")}}</dt>
<dd>返回{{jsxref("Boolean")}}对象的原始值。覆盖了 {{jsxref("Object.prototype.valueOf()")}} 方法。</dd>
</dl>
<h2 id="规范" style="margin-bottom: 20px; line-height: 30px;">规范</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 1.0.</td>
</tr>
<tr>
<td>{{SpecName('ES5.1', '#sec-15.6.3.1', 'Boolean.prototype')}}</td>
<td>{{Spec2('ES5.1')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('ES6', '#sec-boolean.prototype', 'Boolean.prototype')}}</td>
<td>{{Spec2('ES6')}}</td>
<td> </td>
</tr>
<tr>
<td>{{SpecName('ESDraft', '#sec-boolean.prototype', 'Boolean.prototype')}}</td>
<td>{{Spec2('ESDraft')}}</td>
<td> </td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容" style="margin-bottom: 20px; line-height: 30px;">浏览器兼容</h2>
<p>{{Compat("javascript.builtins.Boolean.prototype")}}</p>
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