performance.nodeTiming
此属性是 Node.js 的扩展。它在 Web 浏览器中不可用。
¥This property is an extension by Node.js. It is not available in Web browsers.
PerformanceNodeTiming 类的实例，为特定的 Node.js 操作里程碑提供性能指标。
¥An instance of the PerformanceNodeTiming class that provides performance
metrics for specific Node.js operational milestones.