start(event)

• 名称：tracing:${name}:start

  ¥Name: tracing:${name}:start

start 事件表示函数被调用的时间点。此时，事件数据可能包含函数参数或函数执行开始时可用的任何其他内容。

¥The start event represents the point at which a function is called. At this point the event data may contain function arguments or anything else available at the very start of the execution of the function.