类：PerformanceNodeTiming
🌐 Class: PerformanceNodeTiming
此属性是 Node.js 的扩展。在 Web 浏览器中不可用。
🌐 This property is an extension by Node.js. It is not available in Web browsers.
提供 Node.js 本身的时间详情。该类的构造函数不向用户公开。
🌐 Provides timing details for Node.js itself. The constructor of this class is not exposed to users.