【m】占位重构完成

WebApp/client/src/signaling.js

@@ -191,6 +191,10 @@ export class WebSocketSignaling extends EventTarget {
           this.dispatchEvent(new CustomEvent('candidate', { detail: { connectionId: msg.from, candidate: msg.data.candidate, sdpMLineIndex: msg.data.sdpMLineIndex, sdpMid: msg.data.sdpMid, participantId: msg.participantId } }));
           break;
         case "on-message":
+          // 将participantId附加到消息数据中，以便Host识别消息发送者
+          if (msg.participantId) {
+            msg.data.participantId = msg.participantId;
+          }
           this.dispatchEvent(new CustomEvent('on-message', { detail: msg.data }));
           break;
         case "participant-left":