boolean.valueOf
boolean.valueOf
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)The definition of 'Boolean.prototype.valueOf' in that specification. | Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'Boolean.prototype.valueOf' in that specification. | Standard | |
| ECMAScript Latest Draft (ECMA-262)The definition of 'Boolean.prototype.valueOf' in that specification. | Living Standard | |
浏览器兼容性
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
| Basic Support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
