記号だけでJavaScript!

Gareth HeyesさんがHackvertorに hasegawa タグを追加してjjencode機能を実装してくれました！ すげーーーーーー!
ちなみに、単純に alert するだけじゃなく eval 相当なので好きなJavaScriptプログラムが記号だけで書けます！

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