在此页

• 句法
• 描述
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

toLocaleLowerCase() method returns the calling string value converted to lower case, according to any locale-specific case mappings.

The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

句法

str.toLocaleLowerCase()
str.toLocaleLowerCase(locale)
str.toLocaleLowerCase([locale, locale, ...])
					

参数

locale 可选

locale parameter indicates the locale to be used to convert to lower case according to any locale-specific case mappings. If multiple locales are given in an Array ， best available locale is used. The default locale is the host environment’s current locale.

返回值

A new string representing the calling string converted to lower case, according to any locale-specific case mappings.

异常

• RangeError ("invalid language tag: xx_yy") is thrown if a locale argument isn't a valid language tag.
• TypeError ("invalid element in locales argument") is thrown if an array element isn't of type string.

描述

toLocaleLowerCase() method returns the value of the string converted to lower case according to any locale-specific case mappings. toLocaleLowerCase() does not affect the value of the string itself. In most cases, this will produce the same result as toLowerCase() , but for some locales, such as Turkish, whose case mappings do not follow the default case mappings in Unicode, there may be a different result.

范例

使用 toLocaleLowerCase()

'ALPHABET'.toLocaleLowerCase(); // 'alphabet'
'\u0130'.toLocaleLowerCase('tr') === 'i';    // true
'\u0130'.toLocaleLowerCase('en-US') === 'i'; // false
let locales = ['tr', 'TR', 'tr-TR', 'tr-u-co-search', 'tr-x-turkish'];
'\u0130'.toLocaleLowerCase(locales) === 'i'; // true
					

规范

规范
ECMAScript (ECMA-262) The definition of 'String.prototype.toLocaleLowerCase' in that specification.
ECMAScript 国际化 API (ECMA-402) The definition of 'String.prototype.toLocaleLowerCase' in that specification.

浏览器兼容性

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
toLocaleLowerCase	Chrome 1	Edge 12	Firefox 1	IE 5.5	Opera 4	Safari 1.3	WebView Android 1	Chrome Android 18	Firefox Android 4	Opera Android 10.1	Safari iOS 1	Samsung Internet Android 1.0	nodejs 0.1.100
locale	Chrome 58	Edge 12	Firefox 55	IE 6	Opera 45	Safari 10	WebView Android 58	Chrome Android 58	Firefox Android 55	Opera Android 43	Safari iOS 10	Samsung Internet Android 7.0	nodejs 13.0.0 13.0.0 部分支持 0.12 Before version 13.0.0, only the locale data for en-US is available by default. When other locales are specified, the function silently falls back to en-US . To make full ICU (locale) data available for versions prior to 13, see Node.js documentation on the --with-intl option and how to provide the data.

图例

完整支持

完整支持

见实现注意事项。

另请参阅

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

元数据

• 最后修改： Jan 24, 2020

相关话题

1. 标准内置对象
2. String
3. 特性
   1. String 长度
4. 方法
   1. String.fromCharCode()
   2. String.fromCodePoint()
   3. String.prototype.anchor()
   4. String.prototype.big()
   5. String.prototype.blink()
   6. String.prototype.bold()
   7. String.prototype.charAt()
   8. String.prototype.charCodeAt()
   9. String.prototype.codePointAt()
   10. String.prototype.concat()
   11. String.prototype.endsWith()
   12. String.prototype.fixed()
   13. String.prototype.fontcolor()
   14. String.prototype.fontsize()
   15. String.prototype.includes()
   16. String.prototype.indexOf()
   17. String.prototype.italics()
   18. String.prototype.lastIndexOf()
   19. String.prototype.link()
   20. String.prototype.localeCompare()
   21. String.prototype.match()
   22. String.prototype.matchAll()
   23. String.prototype.normalize()
   24. String.prototype.padEnd()
   25. String.prototype.padStart()
   26. String.prototype.repeat()
   27. String.prototype.replace()
   28. String.prototype.replaceAll()
   29. String.prototype.search()
   30. String.prototype.slice()
   31. String.prototype.small()
   32. String.prototype.split()
   33. String.prototype.startsWith()
   34. String.prototype.strike()
   35. String.prototype.sub()
   36. String.prototype.substr()
   37. String.prototype.substring()
   38. String.prototype.sup()
   39. String.prototype.toLocaleLowerCase()
   40. String.prototype.toLocaleUpperCase()
   41. String.prototype.toLowerCase()
   42. String.prototype.toSource()
   43. String.prototype.toString()
   44. String.prototype.toUpperCase()
   45. String.prototype.trim()
   46. String.prototype.trimEnd()
   47. String.prototype.trimStart()
   48. String.prototype.valueOf()
   49. String.prototype[@@iterator]()
   50. String.raw()
5. 继承：
6. Function
7. 特性
   1. Function.arguments
   2. Function.caller
   3. Function.displayName
   4. Function.length
   5. Function.name
8. 方法
   1. Function.prototype.apply()
   2. Function.prototype.bind()
   3. Function.prototype.call()
   4. Function.prototype.toSource()
   5. Function.prototype.toString()
9. Object
10. 特性
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    2. Object.prototype.constructor
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    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
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    9. Object.prototype.toSource()
    10. Object.prototype.toString()
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