在 Delphi 中调用 JavaScript(2)

本例效果图:

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代码文件:

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Edit1: TEdit;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
  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.

窗体文件:

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object Form1: TForm1
  Left = 0
  Top = 0
  Caption = 'Form1'
  ClientHeight = 167
  ClientWidth = 244
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'Tahoma'
  Font.Style = []
  OldCreateOrder = False
  Position = poDesktopCenter
  PixelsPerInch = 96
  TextHeight = 13
  object Label1: TLabel
    Left = 10
    Top = 140
    Width = 72
    Height = 13
    Caption = #35201#36820#22238#30340#21464#37327
  end
  object Memo1: TMemo
    Left = 0
    Top = 0
    Width = 244
    Height = 121
    Align = alTop
    Font.Charset = DEFAULT_CHARSET
    Font.Color = clWindowText
    Font.Height = -13
    Font.Name = 'Courier New'
    Font.Style = []
    Lines.Strings = (
      'Memo1')
    ParentFont = False
    ScrollBars = ssBoth
    TabOrder = 0
    ExplicitWidth = 323
  end
  object Button1: TButton
    Left = 159
    Top = 134
    Width = 75
    Height = 25
    Caption = #25191#34892#20195#30721
    TabOrder = 1
    OnClick = Button1Click
  end
  object Edit1: TEdit
    Left = 85
    Top = 136
    Width = 61
    Height = 21
    TabOrder = 2
    Text = 'str'
  end
end