Erlang计算二进制中的字符串的长度

Eshell V11.0  (abort with ^G)
1>  Hanzi = unicode:characters_to_list(<<"一二三四五六"/utf8>>,utf8).
"一二三四五六"
2> length(Hanzi).
12
3> Shuzi = unicode:characters_to_list(<<"123456"/utf8>>,utf8).
"123456"
4> length(Shuzi).
6
5>