世界修改 早期执行
The initial UIRawMessage value for this observable.
可选options: ObservableOptions
Optional configuration for the observable, such as whether the value can be written by the client.
世界修改 早期执行
A function that receives the new UIRawMessage value each time the observable changes.
世界修改 早期执行
The callback handle previously returned by subscribe.
An observable that holds a UIRawMessage value. Listeners are notified whenever the value changes.