Boolean.prototype.valueOf() - JavaScript 编辑

valueOf() 方法返回一个Boolean对象的原始值。

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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 (ECMA-262) Boolean.prototype.valueOf	Living Standard

浏览器兼容

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相关链接

• Object.prototype.valueOf()