unit Unit1;

interface

uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls;

type

  TForm1 = class(TForm)

    Memo1: TMemo;

    Button1: TButton;

    procedure Button1Click(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;

var

  Form1: TForm1;

implementation

{$R *.dfm}

  uses ComObj;

  {此函数需要 ComObj 单元的支持}

{参数 JsCode 是要执行的 Js 代码; 参数 JsVar 是要返回的变量}

function RunJs(const JsCode, JsVar: string): string;

var

  script: OleVariant;

begin

  try

    script := CreateOleObject('ScriptControl');

    script.Language := 'JavaScript';

    script.ExecuteStatement(JsCode);

    Result := script.Eval(JsVar);

  except

    Result := '';

  end;

end;

procedure TForm1.Button1Click(Sender: TObject);

var

  s: string;

begin

  s := RunJs(Memo1.Text, 'str');

  ShowMessage(s);

end;

end.