axios 设置全局取消请求

当页面跳转时，可以取消请求
或者当检索信息，更改过滤条件时，取消请求
取消请求，并不意味着服务器也会取消该请求的服务，但是客户端中断了该请求的响应
原理都是用了 xhr的abort方法

import axios from "axios";
let pending = [];
let cancelToken = axios.CancelToken;

function get(url) {
  return new Promise((resolve, injected) => {
    axios
      .get("/api", {
        cancelToken: new cancelToken(function executor(c) {
          pending.push({ url: config.url, c });
        }),
      })
      .then((res) => {
        resolve(res);
        finish(url);
      })
      .catch((error) => {
        injected(error);
        finish(url);
      });
  });
}

function cancel(url) {
  for (let i = 0; i < pending.length; i++) {
    const item = pending[i];
    if (item.url === url) {
      item.c();
      pending.splice(i, 1);
    }
  }
}

function cancelAll() {
  for (let i = 0; i < pending.length; i++) {
    const item = pending[i];
    item.c();
    pending.splice(i, 1);
  }
}

function finish(url) {
  pending = pending.filter((item) => item.url != url);
}

export { get, cancel, cancelAll };