This property getter must be called with the PerformanceResourceTiming object as the receiver.
PerformanceResourceTiming
新增于: v18.2.0, v16.17.0
高精度毫秒时间戳，表示 Node.js 在接收到服务器响应的第一个字节之前的时间。
【The high resolution millisecond timestamp representing the time immediately before Node.js receives the first byte of the response from the server.】