javascript observable
时间: 2023-09-16 14:09:46 浏览: 47
JavaScript Observable is a type of object that allows you to observe changes in its value over time. It is a part of the Reactive Programming paradigm, which is a programming approach that emphasizes the propagation of changes in data streams.
An observable is a data source that emits values over time, and the observer is the entity that receives and processes these values. When an observable emits a new value, it notifies its observers, which then update their state or perform some action based on the new value.
Observables are often used in asynchronous programming, where they can be used to handle events or responses from external systems. They can also be used in user interfaces, where they can be used to update the state of a component based on user input or other events.
In JavaScript, there are many libraries and frameworks that provide support for observables, including RxJS, which is one of the most popular ones. With RxJS, you can create observables from a variety of sources, such as user events, HTTP requests, or timers, and then use a variety of operators to transform and manipulate the data stream.