selenium长截图，截图整个页面

        """
        翻页截图整个页面
        """
        # 获取页面的宽度和高度
        page_width = web_driver.execute_script("return document.body.scrollWidth")
        page_height = web_driver.execute_script("return document.body.scrollHeight")

        # 开启设备模拟
        web_driver.execute_cdp_cmd('Emulation.setDeviceMetricsOverride',
                                   {'mobile': False, 'width': page_width, 'height': page_height,
                                    'deviceScaleFactor': 1})
        # 截图
        res = web_driver.execute_cdp_cmd('Page.captureScreenshot', {'fromSurface': True})
        img_base64 = res['data']

        # 恢复页面到原始状态
        web_driver.execute_cdp_cmd('Emulation.clearDeviceMetricsOverride', {})