The Fetch API is nowadays the de facto way to send asynchronous requests in JavaScript. This is in part due to the fact that the fetch() method accepts a multitude of useful options. One of these is the signal option, which can be used to abort a request. To create a valid value for this option, you can use AbortController.signal after creating a new instance of AbortController. Then, you can use AbortController.abort() to cancel the request at any time.
代码实现
// Create the AbortController
const controller = new AbortController();
const { signal } = controller;
// Perform the request
fetch('https://my.site.com/data', { signal }).then(res => console.log(res));
// Abort the request
controller.abort();This is particularly useful in scenarios where a request takes too long or the response is no longer needed. You can see a common React use-case for this in the useFetch hook.
