ahooks/es/useRequest/src/utils/subscribeReVisible.js

react hooks library

import isBrowser from '../../../utils/isBrowser';
import isDocumentVisible from './isDocumentVisible';
var listeners = [];
function subscribe(listener) {
  listeners.push(listener);
  return function unsubscribe() {
    var index = listeners.indexOf(listener);
    listeners.splice(index, 1);
  };
}
if (isBrowser) {
  var revalidate = function () {
    if (!isDocumentVisible()) return;
    for (var i = 0; i < listeners.length; i++) {
      var listener = listeners[i];
      listener();
    }
  };
  window.addEventListener('visibilitychange', revalidate, false);
}
export default subscribe;