清理缓存、浏览记录、cookie
QWebEngineView view;
view.page()->profile()->setPersistentCookiesPolicy(QWebEngineProfile::NoPersistentCookies);
view.page()->profile()->clearHttpCache(); // 清理缓存
view.page()->profile()->clearAllVisitedLinks(); // 清理浏览记录
QWebEngineCookieStore* pCookie = view.page()->profile()->cookieStore();
pCookie->deleteAllCookies(); // 清理cookie
pCookie->deleteSessionCookies(); // 清理会话cookie