计算二进制中的字符串的长度

47> Var_Hanzi = unicode:characters_to_list(<<"一二三四五六"/utf8>>,utf8).
    [19968,20108,19977,22235,20116,20845]
48> Var_Shuzi = unicode:characters_to_list(<<"123456"/utf8>>,utf8).
    "123456"
49> length(Var_Hanzi).
    6
50> length(Var_Shuzi).
    6