计数器按照 性能对象分成不同的类别。
The counters are grouped into categories known as performance objects.
第二级包括性能计数器，它是性能对象的属性。
The second level consists of the performance counter, which is an attribute of the performance object.
如何获取网页中的每个资源的性能对象？
How to access performance object of every resource in a web page?
应用推荐