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String.prototype.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()

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

例子: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)
String.prototype.toUpperCase
Standard  
ECMAScript 2015 (6th Edition, ECMA-262)
String.prototype.toUpperCase
Standard  

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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