Valid JavaScript variable names in ES5 · Mathias Bynens

Note: This article is based on the ECMAScript 5 specification. For the updated ES2015 version, see Valid JavaScript variable names in ES2015. Did you know var π = Math.PI; is syntactically valid JavaScript? I thought this was pretty cool, so I decided to look into which Unicode glyphs are allowed in JavaScript variable names, or identifiers as the ECMAScript specification calls them. Reserved word

[snomof]

// Code, Y U NO WORK?! var ლ_ಠ益ಠ_ლ = 42;海外でもキモ顔文字に漢字使うのな

[iori_o]

すげぇ

[efcl]

JavaScriptの変数名について。 変数名にユニコード文字も使えるがブラウザにいくつかバグある事や変数名に使える文字列をチェックするツールについて。