解决方法
Lua不看内部字符串.所以,你可以写
mychar = "►"
(2015年新增)
Lua 5.3引入了对UTF-8转义序列的支持：
The UTF-8 encoding of a Unicode character can be inserted in a literal string with the escape sequence \u{XXX} (note the mandatory enclosing brackets),where XXX is a sequence of one or more hexadecimal digits representing the character code point.
你也可以使用utf8.char(9658).