String.prototype.normalize()

概述

normalize() 方法会按照指定的一种 Unicode 正规形式将当前字符串正规化。（如果该值不是字符串，则首先将其转换为一个字符串）。

语法

str.normalize([form]);

参数

form
四种 Unicode 正规形式 "NFC", "NFD", "NFKC", 以及 "NFKD" 其中的一个, 默认值为 "NFC".
  • NFC - Normalization Form Canonical Composition.
  • NFD - Normalization Form Canonical Decomposition.
  • NFKC - Normalization Form Compatibility Composition.
  • NFKD - Normalization Form Compatibility Decomposition.

返回值

含有给定字符串的Unicode规范化形式的字符串。

可能出现的异常

RangeError
如果给  form 传入了非法的参数值, 则会抛出  RangeError 异常.

描述

The normalize() 方法返回字符串的指定Unicode规范化形式。它不影响字符串本身的值。

示例

使用 normalize()

// Initial string

// U+1E9B: LATIN SMALL LETTER LONG S WITH DOT ABOVE
// U+0323: COMBINING DOT BELOW
var str = "\u1E9B\u0323";


// Canonically-composed form (NFC)

// U+1E9B: LATIN SMALL LETTER LONG S WITH DOT ABOVE
// U+0323: COMBINING DOT BELOW
str.normalize("NFC"); // "\u1E9B\u0323"
str.normalize(); // same as above


// Canonically-decomposed form (NFD)

// U+017F: LATIN SMALL LETTER LONG S
// U+0323: COMBINING DOT BELOW
// U+0307: COMBINING DOT ABOVE
str.normalize("NFD"); // "\u017F\u0323\u0307"


// Compatibly-composed (NFKC)

// U+1E69: LATIN SMALL LETTER S WITH DOT BELOW AND DOT ABOVE
str.normalize("NFKC"); // "\u1E69"


// Compatibly-decomposed (NFKD)

// U+0073: LATIN SMALL LETTER S
// U+0323: COMBINING DOT BELOW
// U+0307: COMBINING DOT ABOVE
str.normalize("NFKD"); // "\u0073\u0323\u0307"

规范

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
String.prototype.normalize		 Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
String.prototype.normalize		 Draft

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!
Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 34 31 (31) 未实现 未实现 未实现
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 未实现 34 未实现
bug 864843		 未实现 未实现 未实现

相关链接

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