哪些字符对JavaScript变量名称有效？
任何人都可以指向一个网页，详细说明可用于命名JavaScript变量的字符吗？
我想为我在这里工作的非JavaScript用户创建一个小的“扩展库”（当涉及到这种语言时，他们似乎都很尖锐）。 我喜欢jQuery和Prototype如何使用$美元符号，并且由于我使用jQuery，我正在寻找另一个不错的单字符符号来使用。
我意识到我可以测试一些字符，但是我将这个问题提交给了世界各地的JavaScript学习者，以便了解关于哪些字符（即使有效）将是一个不好的主意（考虑未来也许与另一个流行的图书馆整合）。
为了引用有效的JavaScript变量名称 ，我撰写了总结相关规范部分的文章：
标识符必须以$ ， _或Unicode类别中的任何字符开头：“大写字母（Lu）”，“小写字母（Ll）”，“标题字母（Lt）”，“修饰符字母（Lm）”，“其他字母（Lo）“或”字母编号（Nl）“。
字符串的其余部分可以包含相同的字符，以及任何U + 200C零宽度非连接字符，U + 200D零宽度连接符字符以及Unicode类别中的字符“非间距标记（Mn）”，“间距组合标记（Mc）“，”十进制数字号码（Nd）“或”连接器标点符号（Pc）“。
我还创建了一个工具，它会告诉您，根据ECMAScript 5.1和Unicode 6.1，您输入的任何字符串是否为有效的JavaScript变量名称：
PS给你一个关于安东尼米尔斯的答案是多么错误的想法：如果你想在 JavaScript的一个单一ASCII 纯正则表达式中总结所有这些规则， 那么它将是11,236个字符长 。 这里是：
// ES5.1 / Unicode 6.1
/^(?!(?:do|if|in|for|let|new|try|var|case|else|enum|eval|false|null|this|true|void|with|break|catch|class|const|super|throw|while|yield|delete|export|import|public|return|static|switch|typeof|default|extends|finally|package|private|continue|debugger|function|arguments|interface|protected|implements|instanceof)$)[$A-Z_a-zxaaxb5xbaxc0-xd6xd8-xf6xf8-u02c1u02c6-u02d1u02e0-u02e4u02ecu02eeu0370-u0374u0376u0377u037a-u037du0386u0388-u038au038cu038e-u03a1u03a3-u03f5u03f7-u0481u048a-u0527u0531-u0556u0559u0561-u0587u05d0-u05eau05f0-u05f2u0620-u064au066eu066fu0671-u06d3u06d5u06e5u06e6u06eeu06efu06fa-u06fcu06ffu0710u0712-u072fu074d-u07a5u07b1u07ca-u07eau07f4u07f5u07fau0800-u0815u081au0824u0828u0840-u0858u08a0u08a2-u08acu0904-u0939u093du0950u0958-u0961u0971-u0977u0979-u097fu0985-u098cu098fu0990u0993-u09a8u09aa-u09b0u09b2u09b6-u09b9u09bdu09ceu09dcu09ddu09df-u09e1u09f0u09f1u0a05-u0a0au0a0fu0a10u0a13-u0a28u0a2a-u0a30u0a32u0a33u0a35u0a36u0a38u0a39u0a59-u0a5cu0a5eu0a72-u0a74u0a85-u0a8du0a8f-u0a91u0a93-u0aa8u0aaa-u0ab0u0ab2u0ab3u0ab5-u0ab9u0abdu0ad0u0ae0u0ae1u0b05-u0b0cu0b0fu0b10u0b13-u0b28u0b2a-u0b30u0b32u0b33u0b35-u0b39u0b3du0b5cu0b5du0b5f-u0b61u0b71u0b83u0b85-u0b8au0b8e-u0b90u0b92-u0b95u0b99u0b9au0b9cu0b9eu0b9fu0ba3u0ba4u0ba8-u0baau0bae-u0bb9u0bd0u0c05-u0c0cu0c0e-u0c10u0c12-u0c28u0c2a-u0c33u0c35-u0c39u0c3du0c58u0c59u0c60u0c61u0c85-u0c8cu0c8e-u0c90u0c92-u0ca8u0caa-u0cb3u0cb5-u0cb9u0cbdu0cdeu0ce0u0ce1u0cf1u0cf2u0d05-u0d0cu0d0e-u0d10u0d12-u0d3au0d3du0d4eu0d60u0d61u0d7a-u0d7fu0d85-u0d96u0d9a-u0db1u0db3-u0dbbu0dbdu0dc0-u0dc6u0e01-u0e30u0e32u0e33u0e40-u0e46u0e81u0e82u0e84u0e87u0e88u0e8au0e8du0e94-u0e97u0e99-u0e9fu0ea1-u0ea3u0ea5u0ea7u0eaau0eabu0ead-u0eb0u0eb2u0eb3u0ebdu0ec0-u0ec4u0ec6u0edc-u0edfu0f00u0f40-u0f47u0f49-u0f6cu0f88-u0f8cu1000-u102au103fu1050-u1055u105a-u105du1061u1065u1066u106e-u1070u1075-u1081u108eu10a0-u10c5u10c7u10cdu10d0-u10fau10fc-u1248u124a-u124du1250-u1256u1258u125a-u125du1260-u1288u128a-u128du1290-u12b0u12b2-u12b5u12b8-u12beu12c0u12c2-u12c5u12c8-u12d6u12d8-u1310u1312-u1315u1318-u135au1380-u138fu13a0-u13f4u1401-u166cu166f-u167fu1681-u169au16a0-u16eau16ee-u16f0u1700-u170cu170e-u1711u1720-u1731u1740-u1751u1760-u176cu176e-u1770u1780-u17b3u17d7u17dcu1820-u1877u1880-u18a8u18aau18b0-u18f5u1900-u191cu1950-u196du1970-u1974u1980-u19abu19c1-u19c7u1a00-u1a16u1a20-u1a54u1aa7u1b05-u1b33u1b45-u1b4bu1b83-u1ba0u1baeu1bafu1bba-u1be5u1c00-u1c23u1c4d-u1c4fu1c5a-u1c7du1ce9-u1cecu1cee-u1cf1u1cf5u1cf6u1d00-u1dbfu1e00-u1f15u1f18-u1f1du1f20-u1f45u1f48-u1f4du1f50-u1f57u1f59u1f5bu1f5du1f5f-u1f7du1f80-u1fb4u1fb6-u1fbcu1fbeu1fc2-u1fc4u1fc6-u1fccu1fd0-u1fd3u1fd6-u1fdbu1fe0-u1fecu1ff2-u1ff4u1ff6-u1ffcu2071u207fu2090-u209cu2102u2107u210a-u2113u2115u2119-u211du2124u2126u2128u212a-u212du212f-u2139u213c-u213fu2145-u2149u214eu2160-u2188u2c00-u2c2eu2c30-u2c5eu2c60-u2ce4u2ceb-u2ceeu2cf2u2cf3u2d00-u2d25u2d27u2d2du2d30-u2d67u2d6fu2d80-u2d96u2da0-u2da6u2da8-u2daeu2db0-u2db6u2db8-u2dbeu2dc0-u2dc6u2dc8-u2dceu2dd0-u2dd6u2dd8-u2ddeu2e2fu3005-u3007u3021-u3029u3031-u3035u3038-u303cu3041-u3096u309d-u309fu30a1-u30fau30fc-u30ffu3105-u312du3131-u318eu31a0-u31bau31f0-u31ffu3400-u4db5u4e00-u9fccua000-ua48cua4d0-ua4fdua500-ua60cua610-ua61fua62aua62bua640-ua66eua67f-ua697ua6a0-ua6efua717-ua71fua722-ua788ua78b-ua78eua790-ua793ua7a0-ua7aaua7f8-ua801ua803-ua805ua807-ua80aua80c-ua822ua840-ua873ua882-ua8b3ua8f2-ua8f7ua8fbua90a-ua925ua930-ua946ua960-ua97cua984-ua9b2ua9cfuaa00-uaa28uaa40-uaa42uaa44-uaa4buaa60-uaa76uaa7auaa80-uaaafuaab1uaab5uaab6uaab9-uaabduaac0uaac2uaadb-uaadduaae0-uaaeauaaf2-uaaf4uab01-uab06uab09-uab0euab11-uab16uab20-uab26uab28-uab2euabc0-uabe2uac00-ud7a3ud7b0-ud7c6ud7cb-ud7fbuf900-ufa6dufa70-ufad9ufb00-ufb06ufb13-ufb17ufb1dufb1f-ufb28ufb2a-ufb36ufb38-ufb3cufb3eufb40ufb41ufb43ufb44ufb46-ufbb1ufbd3-ufd3dufd50-ufd8fufd92-ufdc7ufdf0-ufdfbufe70-ufe74ufe76-ufefcuff21-uff3auff41-uff5auff66-uffbeuffc2-uffc7uffca-uffcfuffd2-uffd7uffda-uffdc][$A-Z_a-zxaaxb5xbaxc0-xd6xd8-xf6xf8-u02c1u02c6-u02d1u02e0-u02e4u02ecu02eeu0370-u0374u0376u0377u037a-u037du0386u0388-u038au038cu038e-u03a1u03a3-u03f5u03f7-u0481u048a-u0527u0531-u0556u0559u0561-u0587u05d0-u05eau05f0-u05f2u0620-u064au066eu066fu0671-u06d3u06d5u06e5u06e6u06eeu06efu06fa-u06fcu06ffu0710u0712-u072fu074d-u07a5u07b1u07ca-u07eau07f4u07f5u07fau0800-u0815u081au0824u0828u0840-u0858u08a0u08a2-u08acu0904-u0939u093du0950u0958-u0961u0971-u0977u0979-u097fu0985-u098cu098fu0990u0993-u09a8u09aa-u09b0u09b2u09b6-u09b9u09bdu09ceu09dcu09ddu09df-u09e1u09f0u09f1u0a05-u0a0au0a0fu0a10u0a13-u0a28u0a2a-u0a30u0a32u0a33u0a35u0a36u0a38u0a39u0a59-u0a5cu0a5eu0a72-u0a74u0a85-u0a8du0a8f-u0a91u0a93-u0aa8u0aaa-u0ab0u0ab2u0ab3u0ab5-u0ab9u0abdu0ad0u0ae0u0ae1u0b05-u0b0cu0b0fu0b10u0b13-u0b28u0b2a-u0b30u0b32u0b33u0b35-u0b39u0b3du0b5cu0b5du0b5f-u0b61u0b71u0b83u0b85-u0b8au0b8e-u0b90u0b92-u0b95u0b99u0b9au0b9cu0b9eu0b9fu0ba3u0ba4u0ba8-u0baau0bae-u0bb9u0bd0u0c05-u0c0cu0c0e-u0c10u0c12-u0c28u0c2a-u0c33u0c35-u0c39u0c3du0c58u0c59u0c60u0c61u0c85-u0c8cu0c8e-u0c90u0c92-u0ca8u0caa-u0cb3u0cb5-u0cb9u0cbdu0cdeu0ce0u0ce1u0cf1u0cf2u0d05-u0d0cu0d0e-u0d10u0d12-u0d3au0d3du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从7.6标识符名称和标识符中的ECMAScript规范中，一个有效的标识符被定义为：
Identifier ::
IdentifierName but not ReservedWord
IdentifierName ::
IdentifierStart
IdentifierName IdentifierPart
IdentifierStart ::
UnicodeLetter
$
_
UnicodeEscapeSequence
IdentifierPart ::
IdentifierStart
UnicodeCombiningMark
UnicodeDigit
UnicodeConnectorPunctuation
UnicodeEscapeSequence
UnicodeLetter
any character in the Unicode categories “Uppercase letter (Lu)”, “Lowercase letter (Ll)”, “Titlecase letter (Lt)”,
“Modifier letter (Lm)”, “Other letter (Lo)”, or “Letter number (Nl)”.
UnicodeCombiningMark
any character in the Unicode categories “Non-spacing mark (Mn)” or “Combining spacing mark (Mc)”
UnicodeDigit
any character in the Unicode category “Decimal number (Nd)”
UnicodeConnectorPunctuation
any character in the Unicode category “Connector punctuation (Pc)”
UnicodeEscapeSequence
see 7.8.4.
HexDigit :: one of
0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F
这为命名变量和高尔夫球创造了很多机会。 我们来尝试一些例子。
有效的标识符可以以UnicodeLetter ， $ ， _或 UnicodeEscapeSequence UnicodeLetter 。 unicode字母是来自这些类别的任何字符（请参阅所有类别）：
这仅仅是一些疯狂的可能性 - 工作示例。 如果它在所有浏览器中都不起作用，那就把它称为一个错误，导致它应该。
var ᾩ = "something";
var ĦĔĽĻŎ = "hello";
var 〱〱〱〱 = "less than? wtf";
var जावास्क्रिप्ट = "javascript"; // ok that's JavaScript in hindi
var KingGeorgeⅦ = "Roman numerals, awesome!";
基本上，以正则表达式形式： [a-zA-Z_$][0-9a-zA-Z_$]* 。 换句话说，第一个字符可以是字母或_或$，其他字符可以是字母或_或$或数字。
注意：虽然其他答案指出可以在JavaScript标识符中使用Unicode字符，但实际的问题是“我应该使用什么字符作为扩展库的名称，比如jQuery？” 这是对这个问题的回答。 您可以在标识符中使用Unicode字符，但不要这样做。 编码会一直搞砸。 将您的公共标识符保持在安全的32-126 ASCII范围内。
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