vue-hooks-plus/es/useRequest/utils/subscribeFocus.js

Vue hooks library

import isBrowser from "./utils";
import isDocumentVisible from "./isDocumentVisible";
import isOnline from "./isOnline";
const listeners = [];
function subscribe(listener) {
  listeners.push(listener);
  return function unsubscribe() {
    const index = listeners.indexOf(listener);
    if (index > -1) {
      listeners.splice(index, 1);
    }
  };
}
if (isBrowser) {
  const revalidate = () => {
    if (!isDocumentVisible() || !isOnline())
      return;
    for (let i = 0; i < listeners.length; i++) {
      const listener = listeners[i];
      listener();
    }
  };
  window.addEventListener("visibilitychange", revalidate, false);
  window.addEventListener("focus", revalidate, false);
}
export {
  subscribe as default
};