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如何取消一个 Ajax 请求

jQuery

XMLHttpRequest.abort()

https://stackoverflow.com/questions/446594/abort-ajax-requests-using-jquery

https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/abort

var xhr = new XMLHttpRequest(),
    method = "GET",
    url = "https://developer.mozilla.org/";
xhr.open(method, url, true);

xhr.send();

if (OH_NOES_WE_NEED_TO_CANCEL_RIGHT_NOW_OR_ELSE) {
  xhr.abort();
}

Axios

Fetch

Promise 无法取消(old)

Promise 可以取消了(AbortController)

AbortController

https://developer.mozilla.org/zh-CN/docs/Web/API/FetchController

const controller = new AbortController();
let signal = controller.signal;

const downloadBtn = document.querySelector('.download');
const abortBtn = document.querySelector('.abort');

downloadBtn.addEventListener('click', fetchVideo);

abortBtn.addEventListener('click', function() {
  controller.abort();
  console.log('Download aborted');
});

function fetchVideo() {
  //...
  fetch(url, {signal}).then(function(response) {
    //...
  }).catch(function(e) {
    reports.textContent = 'Download error: ' + e.message;
  })
}

refs

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