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
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) |
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