请参阅 i 的信息

Created: November-22, 2018
iex(1)> i :ok
Term
  :ok
Data type
  Atom
Reference modules
  Atom
iex(2)> x = "mystring"
"mystring"
iex(3)> i x
Term
  "mystring"
Data type
  BitString
Byte size
  8
Description
  This is a string: a UTF-8 encoded binary. It's printed surrounded by
  "double quotes" because all UTF-8 encoded codepoints in it are printable.
Raw representation
  <<109, 121, 115, 116, 114, 105, 110, 103>>
Reference modules
  String, :binary