src/pages/accounts/Account.tsx

@@ -24,6 +24,7 @@ import {
   type ExamListItem,
 } from "~/service/wk";
 import { setUnauthorizedHandler } from "~/service/http";
+import { startSilentAudio, stopSilentAudio } from "~/service/silentAudio";
 import { accountStore, type AccountItem } from "~/store/account";
 import { getMergedHosts, settingsStore } from "~/store/settings";
 import type { CourseType } from "~/types/Course";
@@ -722,6 +723,7 @@ const Account = () => {
     try {
       accountStore.getState().setAccountRunningStudy(account.id, true);
       touchStudyHeartbeat(account.id);
+      startSilentAudio();
       appendStudyLog(`开始刷课：${course.name}`, account.id);
       await runStudyQueue({
         accountId: account.id,
@@ -734,6 +736,7 @@ const Account = () => {
         setIsRunningStudy: () => {
           accountStore.getState().setAccountRunningStudy(account.id, false);
           clearStudyHeartbeat(account.id);
+          stopSilentAudio();
         },
         onLog: (message: string, accoundID: string) => {
           touchStudyHeartbeat(accoundID);
@@ -751,6 +754,7 @@ const Account = () => {
     } finally {
       accountStore.getState().setAccountRunningStudy(account.id, false);
       clearStudyHeartbeat(account.id);
+      stopSilentAudio();
     }
   };
 
@@ -762,6 +766,7 @@ const Account = () => {
 
     accountStore.getState().setAccountRunningStudy(account.id, false);
     clearStudyHeartbeat(account.id);
+    stopSilentAudio();
     appendStudyLog(`已发送停止刷课指令：${account.user.name}`, account.id);
   };
 

src/service/silentAudio.ts

@@ -0,0 +1,57 @@
+/**
+ * Silent audio playback to prevent browser tab throttling during long-running tasks.
+ *
+ * Uses the Web Audio API to produce a nearly inaudible signal that keeps the
+ * browser from suspending the tab's timers and network requests.
+ */
+
+let audioContext: AudioContext | null = null;
+let oscillatorNode: OscillatorNode | null = null;
+let gainNode: GainNode | null = null;
+
+/**
+ * Start playing silent audio. Safe to call multiple times — duplicate calls
+ * are ignored if audio is already playing.
+ */
+export const startSilentAudio = () => {
+  if (oscillatorNode) {
+    return;
+  }
+
+  try {
+    audioContext = new AudioContext();
+    gainNode = audioContext.createGain();
+    gainNode.gain.value = 0.001; // Nearly silent
+
+    oscillatorNode = audioContext.createOscillator();
+    oscillatorNode.type = "sine";
+    oscillatorNode.frequency.value = 1; // Sub-bass, inaudible
+    oscillatorNode.connect(gainNode);
+    gainNode.connect(audioContext.destination);
+    oscillatorNode.start();
+  } catch {
+    // AudioContext may be unavailable in some environments; degrade silently.
+    oscillatorNode = null;
+    gainNode = null;
+    audioContext = null;
+  }
+};
+
+/**
+ * Stop playing silent audio and release resources.
+ */
+export const stopSilentAudio = () => {
+  try {
+    oscillatorNode?.stop();
+  } catch {
+    // Already stopped or never started
+  }
+
+  oscillatorNode?.disconnect();
+  gainNode?.disconnect();
+  audioContext?.close();
+
+  oscillatorNode = null;
+  gainNode = null;
+  audioContext = null;
+};