- 继承自: {EventEmitter}
Instances of the worker.MessagePort class represent one end of an
asynchronous, two-way communications channel. It can be used to transfer
structured data, memory regions and other MessagePorts between different
[Worker][]s.
With the exception of MessagePorts being [EventEmitter][]s rather
than [EventTarget][]s, this implementation matches [browser MessagePort][]s.
