This property getter must be called with the PerformanceResourceTiming object as the receiver.
PerformanceResourceTiming
新增于: v18.2.0, v16.17.0
在 Node.js 开始为资源进行域名查找之前的高精度毫秒时间戳。
【The high resolution millisecond timestamp immediately before the Node.js starts the domain name lookup for the resource.】