fix: 修复多个请求轮询时，设置了窗口不可见停止轮询，离开窗口再回 来，多个轮询请求只剩下一个请求继续轮询的问题（当前问题已在ahooks中修改一版并合入主分支 链接：alibaba/hooks#2688） (#280)

Author: JaxonJay

packages/use-request/src/utils/subscribeFocus.ts

@@ -6,28 +6,25 @@ import isOnline from './isOnline'
 
 type Listener = () => void
 
-const listeners: Listener[] = []
+const listeners = new Set<Listener>();
 
 function subscribe(listener: Listener) {
-  listeners.push(listener)
+  listeners.add(listener);
+
   return function unsubscribe() {
-    const index = listeners.indexOf(listener)
-    if (index > -1) {
-      listeners.splice(index, 1)
-    }
-  }
+    listeners.has(listener) && listeners.delete(listener);
+  };
 }
 
 if (isBrowser) {
   const revalidate = () => {
     if (!isDocumentVisible() || !isOnline()) return
-    for (let i = 0; i < listeners.length; i++) {
-      const listener = listeners[i]
-      listener()
-    }
+    listeners.forEach(listener => {
+      listener();
+    })
   }
-  window.addEventListener('visibilitychange', revalidate, false)
-  window.addEventListener('focus', revalidate, false)
+  window.addEventListener('visibilitychange', revalidate, false);
+  window.addEventListener('focus', revalidate, false);
 }
 
 export default subscribe

packages/use-request/src/utils/subscribeReVisible.ts

@@ -1,23 +1,23 @@
 import isDocumentVisible from "./isDocumentVisible";
 import { canUseDom } from "./utils";
 
-const listeners: any[] = [];
+type Listener = () => void;
 
-function subscribe(listener: () => void) {
-  listeners.push(listener);
+const listeners = new Set<Listener>();
+
+function subscribe(listener: Listener) {
+  listeners.add(listener);
   return function unsubscribe() {
-    const index = listeners.indexOf(listener);
-    listeners.splice(index, 1);
+    listeners.has(listener) && listeners.delete(listener);
   };
 }
 
 if (canUseDom()) {
   const revalidate = () => {
     if (!isDocumentVisible()) return;
-    for (let i = 0; i < listeners.length; i++) {
-      const listener = listeners[i];
+    listeners.forEach(listener => {
       listener();
-    }
+    });
   };
   window.addEventListener("visibilitychange", revalidate, false);
 }