这些键在chrome devtools性能跟踪中意味着什么？

Question

我正在尝试使用chrome性能跟踪的json文件获取脚本函数调用的时间。但是我不明白这些键是什么意思。任何帮助将不胜感激！

  {
    "pid": 9020,
    "tid": 18320,
    "ts": 1212597553830,
    "ph": "B",
    "cat": "devtools.timeline",
    "name": "ParseHTML",
    "tts": 5262246,
    "args": {
      "beginData": {
        "startLine": 9,
        "frame": "612565B625171958EFA3DD57F9B93D26",
        "url": "https://www.example.com/"
      }
  },
  {
    "pid": 9020,
    "tid": 18320,
    "ts": 1212597553925,
    "ph": "B",
    "cat": "v8.execute",
    "name": "RunMicrotasks",
    "tts": 5262326,
    "args": {}
  },