async_hooks.triggerAsyncId()

• 返回：<number> 负责调用当前正在执行的回调的资源 ID。

  ¥Returns: <number> The ID of the resource responsible for calling the callback that is currently being executed.

const server = net.createServer((conn) => {
  // The resource that caused (or triggered) this callback to be called
  // was that of the new connection. Thus the return value of triggerAsyncId()
  // is the asyncId of "conn".
  async_hooks.triggerAsyncId();

}).listen(port, () => {
  // Even though all callbacks passed to .listen() are wrapped in a nextTick()
  // the callback itself exists because the call to the server's .listen()
  // was made. So the return value would be the ID of the server.
  async_hooks.triggerAsyncId();
}); 拷贝

默认情况下，Promise 上下文可能无法获得有效的 triggerAsyncId。请参阅 promise 执行跟踪 部分。

¥Promise contexts may not get valid triggerAsyncIds by default. See the section on promise execution tracking.