bugfix

bricks/rtc.js

@@ -59,6 +59,20 @@ bricks.RTCClient = class extends bricks.VBox {
 		}
 
 	}
+	async function captureScreen() {
+		let mediaStream = null;
+		try {
+			mediaStream = await navigator.mediaDevices.getDisplayMedia({
+				video: {
+					cursor: "always"
+				},
+				audio: false
+			});
+			return mediaStream;
+		} catch (ex) {
+			console.log("Error occurred", ex);
+		}
+	}
 	init_websocket(){
 		this.socket = new WebSocket(this.signaling_url);
 		this.socket.onmessage = this.signaling_message_handle.bind(this);
@@ -151,7 +165,7 @@ bricks.RTCClient = class extends bricks.VBox {
 	// 获取本地媒体流
 	async getLocalStream() {
 		try {
-			var videoOptions = this.mediaOptions || {
+			var mediaOptions = this.mediaOptions || {
 				video: true, 
 				audio: true
 			};