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### Unocodeエスケープシーケンス
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`\u` から始まるUnocodeエスケープシーケンスは**4桁の16進数値**が後続しなければなりません。
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http://www.ecma-international.org/ecma-262/7.0/#sec-literals-string-literals
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- [11.8.3 Numeric Literals - ECMAScript® 2016 Language Specification](http://www.ecma-international.org/ecma-262/7.0/#sec-literals-numeric-literals)
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```
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HexDigit::one of
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0 1 2 3 4 5 6 7 8 9 a b c d e f A B C D E F
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```
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- [11.8.4String Literals - ECMAScript® 2016 Language Specification](http://www.ecma-international.org/ecma-262/7.0/#sec-literals-string-literals)
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```
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UnicodeEscapeSequence::
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u Hex4Digits
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u {HexDigits}
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Hex4Digits::
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HexDigit HexDigit HexDigit HexDigit
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```
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Re: hidepon さん
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