string.toLowerCase
string.toLowerCase
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，表示串转换为小写的调用字符。
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
使用toLowerCase()
console.log('ALPHABET'.toLowerCase() // '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.toLowerCase' in that specification. | Standard | |
| ECMAScript 2015 (6th Edition, ECMA-262)The definition of 'String.prototype.toLowerCase' in that specification. | Standard | |
| ECMAScript Latest Draft (ECMA-262)The definition of 'String.prototype.toLowerCase' in that specification. | Draft | |
浏览器兼容性
| Feature | Chrome | Firefox | Edge | 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) |
