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var
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   Ustr,str:string;
   p:char;
begin
  str:='123456789ABCDEFG'
  L:=length(str);
  for i:=1 to l do begin
      p:=str[i];
      str[i]:=str[l-(i-1)];
     ......

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procedure TForm1.Button2Click(Sender: TObject);
var  
o : Olevariant;
begin  
  webbrowser1.Navigate('http://www.163.com');  
  delay(2000);
  o :=   WebBrowser1.OleObject.document.all.item('username',0);
  o.value := 'username';  
  o := W ......

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