1.5.9 • Published 1 year ago

@alicloud/fetcher-jsonp v1.5.9

Weekly downloads
155
License
MIT
Repository
github
Last release
1 year ago

@alicloud/fetcher-jsonp

@alicloud/fetcher 的底层 Promise 比较「纯」的 jsonp 实现，可以单独使用，返回为封装过的 JsonResponse 而非直接的数据。

何以「纯」？

url 需要使用者来拼接参数（跟原生的 fetch 类似）。

INSTALL

tnpm i @alicloud/fetcher-jsonp -S

APIs

import jsonp, {
  EJsonpError,
  JsonpOptions
} from '@alicloud/fetcher-jsonp';

jsonp(url, {
  timeout, // 超时毫秒数，默认 5 秒（一般来说 JSONP 请求要求必须有超时时间）
  charset,
  jsonpCallback,
  jsonpCallbackFunction,
  signal // 和 fetch 一致
});

如何 abort

参考 https://javascript.info/fetch-abort https://developer.mozilla.org/en-US/docs/Web/API/AbortController

import jsonp from '@alicloud/fetcher-jsonp';

function getAbortSignal(): AbortSignal | undefined {
  if (!window.AbortController) { // IE 下都不支持，请 if 保护
    return;
  }
  
  const abortController = new AbortController();
  
  setTimeout(() => { // 这里是模拟的，实际场景中不会用 setTimeout
    abortController.abort(); // 只有第一次调用有效
  }, 200);
  
  return abortController.signal;
}

return jsonp(jsonpUrl, {
  signal: getAbortSignal(),
  timeout
}).then(response => response.json());

请求被 Abort 只是形式上的 Abort，就像 timeout 一样，请求最终还是会继续（即使 DOM script 已经被移除）。 Abort 后得到的错误和原生的 AbortError 类似，其 name 属性为 AbortError。

fetcherjsonppromise
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