稳定测试版

js/burst-broadcast.js

@@ -0,0 +1,24 @@
+// burst-broadcast.js  (CommonJS)
+function createBurstBroadcaster(broadcast, {
+    event = 'message',      // 要广播的事件名
+    idleMs = 10_000,        // 静默阈值
+    startPayload = 'start', // 静默后先发的内容
+    startOnFirst = true,    // 首条是否也先发 start
+} = {}) {
+    let lastTs = 0;
+
+    return function burstSend(data) {
+        const now = Date.now();
+        const idleTooLong = (now - lastTs) >= idleMs;
+        const isFirst = lastTs === 0;
+
+        if ((startOnFirst && isFirst) || idleTooLong) {
+            broadcast(event, startPayload); // 先发“start”
+        }
+
+        broadcast(event, data);           // 再发真实数据
+        lastTs = now;
+    };
+}
+
+module.exports = { createBurstBroadcaster };