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.

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.

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.

示例

// 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

浏览器兼容性

相关链接

• Unicode Standard Annex #15, Unicode Normalizatoin Forms
• Unicode 等价性