Starts a trace task.**expectedTime** is an optional parameter, which specifies the expected duration of the trace.
Starts a trace task.
If multiple trace tasks with the same name need to be performed at the same time or a trace task needs to be performed multiple times concurrently, different task IDs must be specified in **startTrace**.
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@@ -32,13 +32,11 @@ If the trace tasks with the same name are not performed at the same time, the sa
| -------- | -------- | -------- | -------- |
| name | string | Yes| Name of the trace task to start.|
| taskId | number | Yes| Task ID.|
| expectedTime | number | No| Expected duration of the trace, in ms.|
**Example**
```
hiTraceMeter.startTrace("myTestFunc", 1);
hiTraceMeter.startTrace("myTestFunc", 1, 5); // The expected duration of the trace task is 5 ms.