unit Unit1;interfaceuses  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls;type  TForm1 = class(TForm)    Panel1: TPanel;    Button1: TButton;    Edit1: TEdit;    Memo1: TMemo;    Button2: TButton;    procedure Button1Click(Sender: TObject);    procedure Button2Click(Sender: TObject);  private    { Private declarations }    function getmaxval(myarray: array of Integer):Integer;  public    { Public declarations }  end;var  Form1: TForm1;implementation{$R *.dfm}var  rec: Integer = 0;procedure TForm1.Button1Click(Sender: TObject);var  i,j,m,n,p:Integer;  edt: TEdit;  arr: array of Integer;begin  Inc(rec);  //按钮点击次数  m := 0;  n := 0;  p := 0;  Memo1.Clear;  for i := 0 to Panel1.ControlCount - 1 do  begin    if Panel1.Controls[i] is TEdit then    inc(m);  //记录edit个数  end;  SetLength(arr,m);  Memo1.Lines.Add(‘创建组件前的记录:‘ + #13#10 + ‘--------------------------‘);  Memo1.Lines.Add(‘Edit组件个数:‘ + IntToStr(m) + #13#10 + ‘--------------------------‘);  for j := 0 to Panel1.ControlCount - 1 do  begin    if Panel1.Controls[j] is TEdit then    begin      if n <= m then      begin        arr[n] := TEdit(Panel1.Controls[j]).Top;        Memo1.Lines.Add(‘Edit‘ + IntToStr(n + 1) + ‘的Top值:‘ + IntToStr(arr[n]));        Inc(n);      end else Break;    end;  end;  p := getmaxval(arr); //记录panel里最下面的edit的top值  Memo1.Lines.Add(‘最大Top值:‘ + inttostr(p));  //动态创建Edit  //TEdit.Create()，参数是一个AOwner: TComponent，只要是窗体上的组件都可以，  //但必须要在创建后重新指明父组件的名称，否则没法显示  edt := TEdit.Create(Panel1);  //指明了owner，可以不释放内存，窗口关闭时由父组件销毁  edt.Parent := Panel1;  edt.Left := Edit1.Left;  edt.Top := p + Edit1.Height + 3;  edt.Width := Edit1.Width;  edt.Height := Edit1.Height;  edt.Text := ‘Edit‘ + IntToStr(rec + 1);  edt.Show;end;procedure TForm1.Button2Click(Sender: TObject);  //释放内存，并初始化var  i,j,m:Integer;  edts: array of TEdit;begin  j := 0;  //数组edts的键[key]  SetLength(edts,rec + 1);  //button1次数 + 原有的edit1  for i := 0 to Panel1.ControlCount - 1 do  begin    if Panel1.Controls[i] is TEdit then    begin      edts[j] := TEdit(Panel1.Controls[i]);      Inc(j);    end;  end;  for m := Length(edts) downto 1 do  //edit1不释放  begin    try      edts[m].Free;      rec := 0;      Memo1.Clear;    except      //ShowMessage(‘释放动态创建组件的内存失败！‘);    end;  end;end;function TForm1.getmaxval(myarray: array of Integer):Integer;  //遍历数组取得最大值var  i,max:Integer;begin  max := myarray[0];  for i := 1 to Length(myarray) - 1 do  begin    if myarray[i] >= max then    max := myarray[i];  end;  Result := max;end;end.