string.toUpperCase
string.toUpperCase
toUpperCase() 将调用该方法的字符串值转换为大写形式，并返回。
语法
str.toUpperCase()
返回值
表示调用字符串转换为大写的新字符串。
描述
toUpperCase 将调用该方法的字符串值转换为大写形式，并返回。toUpperCase 方法不影响字符串本身的值。
示例
使用 toUpperCase()
console.log('alphabet'.toUpperCase() // 'ALPHABET'
规范
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.0. |
| ECMAScript 5.1 (ECMA-262)The definition of 'String.prototype.toUpperCase' in that specification. | Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'String.prototype.toUpperCase' in that specification. | Standard | |
| ECMAScript Latest Draft (ECMA-262)The definition of 'String.prototype.toUpperCase' 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) |
