TExtension = class(TCefv8HandlerOwn)
  private
    FTestParam: ustring;
  protected
    function Execute(const name: ustring; const obj: ICefv8Value;
      const arguments: TCefv8ValueArray; var retval: ICefv8Value;
      var exception: ustring): Boolean; override;  //重写Execute事件
  end;

function TExtension.Execute(const name: ustring; const obj: ICefv8Value;
  const arguments: TCefv8ValueArray; var retval: ICefv8Value;
  var exception: ustring): Boolean;
begin
  if(name = \'SetTestParam\') then
  begin
    // Handle the SetTestParam native function by saving the string argument
    // into the local member.
    if (Length(arguments) <> 1) or (not arguments[0].IsString) then
    begin
      Result := false;
      Exit;
    end;
    FTestParam := arguments[0].GetStringValue;  //多个参数arguments[i].GetStringValue 依次类推
    Result := true;
  end
  else if(name = \'GetTestParam\') then
  begin
    // Handle the GetTestParam native function by returning the local member
    // value.
    retval := TCefv8ValueRef.CreateString(Ftestparam);
    Result := true;
  end
  else if (name = \'GetTestObject\') then
  begin
    // Handle the GetTestObject native function by creating and returning a
    // new V8 object.
    retval := TCefv8ValueRef.CreateObject(nil);
    // Add a string parameter to the new V8 object.
    retval.SetValueByKey(\'param\', TCefv8ValueRef.CreateString(
        \'Retrieving a parameter on a native object succeeded.\'));
    // Add a function to the new V8 object.
    retval.SetValueByKey(\'GetMessage\',
        TCefv8ValueRef.CreateFunction(\'GetMessage\', Self));
    Result := true;
  end
  else if(name = \'GetMessage\') then
  begin
    // Handle the GetMessage object function by returning a string.
    retval := TCefv8ValueRef.CreateString(
        \'Calling a function on a native object succeeded.\');
    Result := true;
  end else
    Result := false;
end;

procedure RegisterExtension;
var
  Code: string;
begin
  Code :=
    \'var cef;if(!cef)cef={};if(!cef.taobao)cef.taobao={};(function(){cef.taobao.test_object=function(){native function GetTestObject();return GetTestObject();};})();\';
  if Code <> \'\' then
  try
    CefRegisterExtension(\'example/v8\',Code,TExtension.Create as ICefv8Handler);
  except
  end;
end;