原始碼：

bool QCefView::createCefBrowser()
{
    RECT rect = { 0 };
 
    CefWindowInfo windowInfo;
    CefBrowserSettings browserSettings;
 
    windowInfo.SetAsChild(reinterpret_cast<HWND>(this->winId()), rect);
    CefBrowserHost::CreateBrowser(windowInfo, _browserHandler.get(),
        CefString(_url.toStdWString()), browserSettings, nullptr);
 
 
    
 
return true;
}

修改後：

bool QCefView::createCefBrowser()
{
    RECT rect;
    rect.left = 0;
    rect.top = 0;
    rect.right = qobject_cast<QWidget*>(this->parent())->width();
    rect.bottom = qobject_cast<QWidget*>(this->parent())->height();
 
    CefWindowInfo windowInfo;
    CefBrowserSettings browserSettings;
 
    windowInfo.SetAsChild(reinterpret_cast
 
<HWND>(this->winId()), rect);
    CefBrowserHost::CreateBrowser(windowInfo, _browserHandler.get(),
        CefString(_url.toStdWString()), browserSettings, nullptr);
 
    return true;
}

原來是沒設定大小，淦