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  

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