哪些字符可用于命名 JavaScript 变量？
我想为我在工作中的非JavaScript用户创建一个小型的“扩展库”（当涉及到语言时，他们似乎都很紧张）。我喜欢jQuery和Prototype都使用美元符号的方式，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，但我希望从缩小字符列表的范围开始（考虑到将来与另一个流行的库的集成， 也许）。
为了引用有效的JavaScript变量名称，我总结了相关的规范部分：
标识符必须以 、 或 Unicode 类别“大写字母 （Lu）”、“小写字母 （Ll）”、“标题大小写字母 （Lt）”、“修饰符字母 （Lm）”、“其他字母 （Lo）”或“字母编号 （Nl）”中的任何字符开头。
$_字符串的其余部分可以包含相同的字符，以及任何 U+200C 零宽度非连接器字符、U+200D 零宽度连接器字符以及 Unicode 类别“非间距标记 （Mn）”、“间距组合标记 （Mc）”、“十进制数字 （Nd）”或“连接器标点符号 （Pc）”中的字符。
我还创建了一个工具，该工具将告诉您输入的任何字符串是否为符合 ECMAScript 5.1 和 Unicode 6.1 的有效 JavaScript 变量名称：
附言：为了让你了解Anthony Mills的答案是多么错误：如果你要用一个仅限ASCII的JavaScript正则表达式来总结所有这些规则，它将是11，236个字符长。在这里：
// ES5.1 / Unicode 6.1
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根据 ECMAScript 规范中 7.6 标识符名称和标识符，有效标识符定义为：
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创造了很多机会。让我们尝试一些例子。
有效的标识符可以以 、 、 或 开头。Unicode 字母是这些类别中的任何字符（查看所有类别）：UnicodeLetter$_\ UnicodeEscapeSequence
仅此一点就解释了一些疯狂的可能性 - 工作示例。如果它不能在所有浏览器中工作，那么请将其称为错误，因为它应该。
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!";
