python - Chrome 性能日志消息中的时间戳格式是什么？

Question

我将 Selenium 与 ChromeDriver 结合使用来从 Chrome 获取性能日志。

caps = DesiredCapabilities.CHROME
caps['loggingPrefs'] = {'performance': 'ALL'}

driver = webdriver.Chrome(desired_capabilities=caps)
driver.get("some.website")
time.sleep(5)

for entry in driver.get_log('performance'):
    print(entry)

检查这些消息时，我发现一个 timestamp 字段具有奇怪的值 (779922.902049)。所以我的问题是这个 timestamp 字段的格式是什么？

{'message': '{"message":{"method":"Network.responseReceived","params":{"frameId":"29983.1","loaderId":"29983.1","requestId":"29983.1","response":{"connectionId":0,"connectionReused":false,"encodedDataLength":0,"fromDiskCache":fals
e,"fromServiceWorker":false,"headers":{"Access-Control-Allow-Origin":"*","Content-Type":"text/plain;charset=US-ASCII"},"mimeType":"text/plain","protocol":"data","securityState":"unknown","status":200,"statusText":"OK","url":"data:
,"},<b>"timestamp":779922.902049</b>,"type":"Document"}},"webview":"e6d532fe-f007-4397-bf28-4c4a26c79e4d"}', 'level': 'INFO', 'timestamp': 1523607170083}

{'message': '{"message":{"method":"Network.loadingFinished","params":{"encodedDataLength":0,"requestId":"29983.1",<b>"timestamp":779922.902067</b>}},"webview":"e6d532fe-f007-4397-bf28-4c4a26c79e4d"}', 'level': 'INFO', 'timestamp': 152360
7170083}

注意，上面的消息中还有另一个timestamp字段，它是自纪元以来的毫秒数。但这不是我要问的领域。

Answer 1

我发现它是距离上次系统启动时间(即系统正常运行时间)的秒数。但我找不到任何描述此时间戳格式的文档。