toString() 方法返回指定的布尔对象的字符串形式。

语法

bool.toString()

返回值

表示特定Boolean对象的字符串。

描述

Boolean 对象覆盖了 Object 对象的  toString 方法。并没有继承 Object.prototype.toString()。对于布尔对象,toString 方法返回该对象的字符串形式。

当一个Boolean对象作为文本值或进行字符串连接时,JavaScript 会自动调用其 toString 方法。

对于Boolean对象或值,内置的 toString 方法返回字符串 "true" 或 "false",具体返回哪个取决于布尔对象的值。

示例

使用 toString

下面的代码,flag.toString 返回 "true":

var flag = new Boolean(true)
var myVar = flag.toString()

规范

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