procedure TForm1.Button1Click(Sender: TObject);
var
s : string;
begin
combobox1.Clear;
s := "01";
combobox1.Items.AddObject("北京",TObject(s));
s := "02";
combobox1.Items.AddObject("天津",TObject(s));
s := "03";
combobox1.Items.AddObject("上海",TObject(s));
end;
procedure TForm1.ComboBox1Change(Sender: TObject);
begin
edit1.Text := string(combobox1.Items.Objects[combobox1.ItemIndex]);
end;
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