Edit D:\xinhaisoft\crisis_new\api\node_modules\@azure\abort-controller\README.md
# Azure Abort Controller library for JavaScript The `@azure/abort-controller` package provides `AbortController` and `AbortSignal` classes. These classes are compatible with the [AbortController](https://developer.mozilla.org/docs/Web/API/AbortController) built into modern browsers and the `AbortSignal` used by [fetch](https://developer.mozilla.org/docs/Web/API/Fetch_API). Use the `AbortController` class to create an instance of the `AbortSignal` class that can be used to cancel an operation in an Azure SDK that accept a parameter of type `AbortSignalLike`. ## Getting started ### Installation Install this library using npm as follows ``` npm install @azure/abort-controller ``` ## Key Concepts Use the `AbortController` to create an `AbortSignal` which can then be passed to Azure SDK operations to cancel pending work. The `AbortSignal` can be accessed via the `signal` property on an instantiated `AbortController`. An `AbortSignal` can also be returned directly from a static method, e.g. `AbortController.timeout(100)`. that is cancelled after 100 milliseconds. Calling `abort()` on the instantiated `AbortController` invokes the registered `abort` event listeners on the associated `AbortSignal`. Any subsequent calls to `abort()` on the same controller will have no effect. The `AbortSignal.none` static property returns an `AbortSignal` that can not be aborted. Multiple instances of an `AbortSignal` can be linked so that calling `abort()` on the parent signal, aborts all linked signals. This linkage is one-way, meaning that a parent signal can affect a linked signal, but not the other way around. To link `AbortSignals` together, pass in the parent signals to the `AbortController` constructor. ## Examples The below examples assume that `doAsyncWork` is a function that takes a bag of properties, one of which is of the abort signal. ### Example 1 - basic usage ```js import { AbortController } from "@azure/abort-controller"; const controller = new AbortController(); doAsyncWork({ abortSignal: controller.signal }); // at some point later controller.abort(); ``` ### Example 2 - Aborting with timeout ```js import { AbortController } from "@azure/abort-controller"; const signal = AbortController.timeout(1000); doAsyncWork({ abortSignal: signal }); ``` ### Example 3 - Aborting sub-tasks ```js import { AbortController } from "@azure/abort-controller"; const allTasksController = new AbortController(); const subTask1 = new AbortController(allTasksController.signal); const subtask2 = new AbortController(allTasksController.signal); allTasksController.abort(); // aborts allTasksSignal, subTask1, subTask2 subTask1.abort(); // aborts only subTask1 ``` ### Example 4 - Aborting with parent signal or timeout ```js import { AbortController } from "@azure/abort-controller"; const allTasksController = new AbortController(); // create a subtask controller that can be aborted manually, // or when either the parent task aborts or the timeout is reached. const subTask = new AbortController(allTasksController.signal, AbortController.timeout(100)); allTasksController.abort(); // aborts allTasksSignal, subTask subTask.abort(); // aborts only subTask ``` ## Contributing If you'd like to contribute to this library, please read the [contributing guide](https://github.com/Azure/azure-sdk-for-js/blob/master/CONTRIBUTING.md) to learn more about how to build and test the code. 
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