在 Delphi 中调用 JavaScript(一)

本例测试用的 Html 文件(包含三个要测试的 Js 函数):

 

<html> <head> <title></title> <SCRIPT LANGUAGE=javascript> <!-- //重复字符串的函数 function JsStr2(str) { return str + str; } //计算一个数的倍数的函数 function JsNum2(num) { return num + num; } //弹出信息框的函数 function JsMsg(msg) { alert(msg); } //--> </SCRIPT> </head> <body> </body> </html>

 


本例效果图:
 


代码文件:

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    WebBrowser1: TWebBrowser;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure FormCreate(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
var
  HtmlPath: string;
begin
  WebBrowser1.Left := -WebBrowser1.Width; {隐藏 WebBrowser1}
  HtmlPath := ExtractFilePath(ParamStr(0)) + 'Test.htm';
  WebBrowser1.Navigate(HtmlPath);
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  str: Variant;
begin
  str := WebBrowser1.OleObject.document.parentWindow.JsStr2('12345');
  ShowMessage(str);
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  num: Variant;
begin
  num := WebBrowser1.OleObject.document.parentWindow.JsNum2(4);
  ShowMessage(num);
end;

procedure TForm1.Button3Click(Sender: TObject);
begin
  WebBrowser1.OleObject.document.parentWindow.JsMsg('ABC');

  {也可以这样:}
  WebBrowser1.OleObject.document.parentWindow.execScript('JsMsg("ABCDEFG")', 'JavaScript');
end;

end.

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