#QWebEngineView的下载请求信号 QWebEngineView().page().profile().downloadRequested.connect(self.on_downloadRequested)
#QWebEngineDownloadItem 下载过程的信号 QWebEngineDownloadItem().downloadProgress.connect(self._downloadProgress) 下载结束的信号 QWebEngineDownloadItem().finished.connect(self._finished)
https://stackoverflow.com/questions/50164712/how-to-open-download-file-dialog-with-qwebengineview-on-pyqt5 https://stackoverflow.com/questions/38812787/how-to-handle-downloads-in-qwebengine