Fetch取消请求

AbortController

// Create an instance.
const controller = new AbortController()
const signal = controller.signal

function beginFetching() {
    console.log('Now fetching');
    var urlToFetch = "https://httpbin.org/delay/3";

    fetch(urlToFetch, {
            method: 'get',
            signal: signal,
        })
        .then(function(response) {
            console.log(`Fetch complete. (Not aborted)`);
        }).catch(function(err) {
            console.error(` Err: ${err}`);
        });
}


function abortFetching() {
    console.log('Now aborting');
    // Abort.
    controller.abort()
}