SysUtils.Trim、SysUtils.TrimLeft、SysUtils.TrimRight 删除空格

举例:
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var
  ss,s: string;
begin
  ss := '  Delphi  ';
  s := Trim(ss);              {删除两边空格}
  ShowMessage('^' + s + '$'); {^Delphi$}

  s := TrimLeft(ss);          {删除左空格}
  ShowMessage('^' + s + '$'); {^Delphi  $}

  s := TrimRight(ss);         {删除右空格}
  ShowMessage('^' + s + '$'); {^  Delphi$}
end;
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