`Boolean.prototype` 属性表示`Boolean` 构造函数的原型。

`Boolean.prototype` 属性的属性特性：
writable | false
enumerable | false
configurable | false

## 描述

`Boolean`实例继承自`Boolean.prototype`。你可以使用构造函数的原型对象向所有`Boolean`实例添加属性或方法。

## 属性

`Boolean.prototype.constructor`
  返回创建了实例原型的函数。默认为`Boolean`函数。

## 方法

`Boolean.prototype.toSource()`
  返回包含`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`Object.prototype.toSource()` 方法。
`Boolean.prototype.toString()`
  根据对象的值来返回一个字符串：`"true"` 或 `"false"`。覆盖了 `Object.prototype.toString()` 方法。
`Boolean.prototype.valueOf()`
  返回`Boolean`对象的原始值。覆盖了 `Object.prototype.valueOf()` 方法。

## 规范

Specification | Status | Comment
--- | --- | ---
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.0.
ECMAScript 5.1 (ECMA-262) Boolean.prototype | Standard |
ECMAScript 2015 (6th Edition, ECMA-262) Boolean.prototype | Standard |
ECMAScript Latest Draft (ECMA-262) Boolean.prototype | Draft |

## 浏览器兼容

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

| Desktop | Mobile | Server
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | Safari on iOS | Samsung Internet | Node.js
`prototype` | Chrome Full support Yes | Edge Full support 12 | Firefox Full support 1 | IE Full support Yes | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Edge Mobile Full support Yes | Firefox Android Full support 4 | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes | nodejs Full support Yes

### Legend

Full support
  Full support