performance.mark([name])


在性能时间轴中创建新的 PerformanceMark 条目。 PerformanceMarkPerformanceEntry 的子类,其 performanceEntry.entryType 始终为 'mark',而其 performanceEntry.duration 始终为 0。 性能标记用于标记性能时间轴中的特定重要时刻。

Creates a new PerformanceMark entry in the Performance Timeline. A PerformanceMark is a subclass of PerformanceEntry whose performanceEntry.entryType is always 'mark', and whose performanceEntry.duration is always 0. Performance marks are used to mark specific significant moments in the Performance Timeline.