String.prototype.toLowerCase() - JavaScript 编辑

toLowerCase() 会将调用该方法的字符串值转为小写形式，并返回。

语法

str.toLowerCase()

返回值

一个新的字符串，表示转换为小写的调用字符串。

描述

toLowerCase 会将调用该方法的字符串值转为小写形式，并返回。toLowerCase 不会影响字符串本身的值。

示例

例子：使用 toLowerCase()

console.log('中文简体 zh-CN || zh-Hans'.toLowerCase());
// 中文简体 zh-cn || zh-hans

​console.log( "ALPHABET".toLowerCase() );
// "alphabet"

说明

Specification	Status	Comment
ECMAScript 1st Edition (ECMA-262)	Standard	Initial definition. Implemented in JavaScript 1.0.
ECMAScript 5.1 (ECMA-262) String.prototype.toLowerCase	Standard
ECMAScript 2015 (6th Edition, ECMA-262) String.prototype.toLowerCase	Standard
ECMAScript (ECMA-262) String.prototype.toLowerCase	Living Standard

浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

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)

相关链接

• String.prototype.toLocaleLowerCase()
• String.prototype.toLocaleUpperCase()
• String.prototype.toUpperCase()