发消息不知道，但可以模拟按键
WebBrowser1.SetFocus;
keybd_event(VK_CONTROL, MapVirtualKey(VK_CONTROL, 0), 0, 0);
keybd_event(13, MapVirtualKey(13, 0), 0, 0);
keybd_event(13, MapVirtualKey(13, 0), KEYEVENTF_KEYUP, 0);
keybd_event(VK_CONTROL, MapVirtualKey(VK_CONTROL, 0), KEYEVENTF_KEYUP, 0);
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