self.settings().setAttribute(QWebEngineSettings.PluginsEnabled, True)  #支持视频播放

self.page().windowCloseRequested.connect(self.on_windowCloseRequested)  #页面关闭请求

self.page().profile().downloadRequested.connect(self.on_downloadRequested) #页面下载请求

import sys
import os
import datetime
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtWebEngineWidgets import QWebEngineView,QWebEngineSettings
 
# 调试窗口配置
# 如果不想自己创建调试窗口，可以使用Chrome连接这个地址进行调试
DEBUG_PORT = '5588'
DEBUG_URL = 'http://127.0.0.1:%s' % DEBUG_PORT
os.environ['QTWEBENGINE_REMOTE_DEBUGGING'] = DEBUG_PORT
 
################################################
#######创建主窗口
################################################
class MainWindow(QMainWindow):
  def __init__(self, *args, **kwargs):
    super().__init__(*args, **kwargs)
    self.setWindowTitle('My Browser')
    #self.showMaximized()
    self.setWindowFlags(Qt.FramelessWindowHint)
 
    #####创建tabwidget
    self.tabWidget = QTabWidget()
    self.tabWidget.setTabShape(QTabWidget.Triangular)
    self.tabWidget.setDocumentMode(True)
    self.tabWidget.setMovable(True)
    self.tabWidget.setTabsClosable(True)
    self.tabWidget.tabCloseRequested.connect(self.close_Tab)
    self.setCentralWidget(self.tabWidget)
 
    ####第一个tab
    self.webview = WebEngineView(self)  #self必须要有，是将主窗口作为参数，传给浏览器
    self.webview.load(QUrl("https://www.baidu.com"))
    self.create_tab(self.webview)
 
    #网页调试窗口
    self.inspector = QWebEngineView()
    self.inspector.setWindowTitle('Web Inspector')
    self.inspector.load(QUrl(DEBUG_URL))
    self.webview.loadFinished.connect(self.handleHtmlLoaded)    
 
  # 加载完成后显示调试网页
  def handleHtmlLoaded(self, ok):
    if ok:
      self.webview.page().setDevToolsPage(self.inspector.page())
      self.inspector.show()
 
  #创建tab
  def create_tab(self,webview):
    self.tab = QWidget()
    self.tabWidget.addTab(self.tab, "新标签页")
    self.tabWidget.setCurrentWidget(self.tab)
    #####
    self.Layout = QHBoxLayout(self.tab)
    self.Layout.setContentsMargins(0, 0, 0, 0)
    self.Layout.addWidget(webview)
 
  #关闭tab
  def close_Tab(self,index):
    if self.tabWidget.count()>1:
      self.tabWidget.removeTab(index)
    else:
      self.close()  # 当只有1个tab时，关闭主窗口
 
################################################
#######创建浏览器
################################################
class WebEngineView(QWebEngineView):
 
  def __init__(self,mainwindow,parent=None):
    super(WebEngineView, self).__init__(parent)
    self.mainwindow = mainwindow
    ##############
    self.settings().setAttribute(QWebEngineSettings.PluginsEnabled, True)   #支持视频播放
    self.page().windowCloseRequested.connect(self.on_windowCloseRequested)   #页面关闭请求
    self.page().profile().downloadRequested.connect(self.on_downloadRequested) #页面下载请求
 
  # 支持页面关闭请求
  def on_windowCloseRequested(self):
    the_index = self.mainwindow.tabWidget.currentIndex()
    self.mainwindow.tabWidget.removeTab(the_index)
 
 
  # 支持页面下载按钮
  def on_downloadRequested(self,downloadItem):
    if downloadItem.isFinished()==False and downloadItem.state()==0:
      ###生成文件存储地址
      the_filename = downloadItem.url().fileName()
      if len(the_filename) == 0 or "." not in the_filename:
        cur_time = datetime.datetime.now().strftime('%Y%m%d%H%M%S')
        the_filename = "下载文件" + cur_time + ".xls"
      the_sourceFile = os.path.join(os.getcwd(), the_filename)
 
      ###下载文件
      # downloadItem.setSavePageFormat(QWebEngineDownloadItem.CompleteHtmlSaveFormat)
      downloadItem.setPath(the_sourceFile)
      downloadItem.accept()
      downloadItem.finished.connect(self.on_downloadfinished)
 
 
  # 下载结束触发函数
  def on_downloadfinished(self):
    js_string = '''
    alert("下载成功，请到软件同目录下，查找下载文件！"); 
    '''
    self.page().runJavaScript(js_string)
 
 
  # 重写createwindow()
  def createWindow(self, QWebEnginePage_WebWindowType):
    new_webview = WebEngineView(self.mainwindow)
 
    self.mainwindow.create_tab(new_webview)
 
    return new_webview
 
 
################################################
#######程序入门
################################################
if __name__ == "__main__":
  app = QApplication(sys.argv)
  the_mainwindow = MainWindow()
  the_mainwindow.show()
  sys.exit(app.exec())