Can js handle concurrent requests?

  node.js, question

Asynchronous requests can only get the last piece of data after the execution of the for loop, so requests for services in the for loop can only use synchronization, but in case there are hundreds of data, it is not hundreds of synchronous requests, which is too slow. I wonder if js has a way to have more than one concurrent request at a time.

Can you post a code to see, now changed the problem is still a bit ambiguous.