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hmenu = GetMenu(hWnd);
haddmenu = CreateMenu();
AppendMenu(haddmenu, MF_ENABLED, 4, "求和");
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LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    HMENU hmenu, haddmenu/*添加的菜单句柄*/;
    switch(message)
    {
    case WM_COMMAND :
        switch (LOWORD(wParam))
        {
        case 1 : // 添加菜单项
            hmenu = GetMenu(hWnd);
            haddmenu = CreateMenu();
            AppendMenu(haddmenu, MF_ENABLED, 4, "求和");
            AppendMenu(haddmenu, MF_ENABLED, 5, "求差");
            InsertMenu(hmenu, 2, MF_POPUP | MF_BYPOSITION, (UINT)haddmenu, "统计计算");
            EnableMenuItem(hmenu, 1, MF_GRAYED);
            EnableMenuItem(hmenu, 2, MF_ENABLED);
            DrawMenuBar(hWnd);
            break;
        case 2 : // 删除菜单项
            hmenu = GetMenu(hWnd);
            DeleteMenu(hmenu, 2, MF_BYPOSITION);
            EnableMenuItem(hmenu, 1, MF_ENABLED);
            EnableMenuItem(hmenu, 2, MF_GRAYED);
            DrawMenuBar(hWnd);
            break;
        }
        break;
    }
}