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Boolean.prototype.valueOf()

valueOf() 方法返回一个Boolean对象的原始值(primitive value)。

语法

bool.valueOf()

参数

描述

Boolean 的 valueOf 方法返回一个布尔对象或布尔字面量的原始值。

该方法通常在 JavaScript 内部调用,而不是在代码中显示调用。

示例

例子: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 2016 Draft (7th Edition, ECMA-262)
Boolean.prototype.valueOf
Draft  

浏览器兼容性

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support (Yes) (Yes) (Yes) (Yes) (Yes)
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) (Yes) (Yes) (Yes)

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