valueOf() 方法返回一个Boolean对象的原始值。

语法

bool.valueOf()

返回值

给定Boolean对象的原始值

描述

Boolean的 valueOf 方法返回一个Boolean对象或Boolean字面量的原始值作为布尔数据类型。

该方法通常在 JavaScript 内部调用,而不是在代码中显式调用。

示例

使用 valueOf

x = new Boolean();
myVar = x.valueOf()      // assigns false to myVar

规范

Specification Status Comment
ECMAScript 1st Edition (ECMA-262) Standard Initial definition. Implemented in JavaScript 1.1.
ECMAScript 5.1 (ECMA-262)
Boolean.prototype.valueOf
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
Boolean.prototype.valueOf
Standard  
ECMAScript Latest Draft (ECMA-262)
Boolean.prototype.valueOf
Draft  

浏览器兼容

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome Full support YesEdge Full support YesFirefox Full support 1IE Full support YesOpera Full support YesSafari Full support YesWebView Android Full support YesChrome Android Full support YesEdge Mobile Full support YesFirefox Android Full support 4Opera Android Full support YesSafari iOS Full support YesSamsung Internet Android Full support Yesnodejs Full support Yes

Legend

Full support  
Full support

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此页面的贡献者: fscholz, zhangchen, yenshen, AlexChao
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