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	<!DOCTYPE html>
	<html lang="zh-CN">
	<head>
	<meta charset="UTF-8">
	<meta name="viewport" content="width=device-width, initial-scale=1.0">
	<title>视频会议应用</title>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/4.4.1/socket.io.min.js"></script>
	<script src="https://cdnjs.cloudflare.com/ajax/libs/webrtc-adapter/8.1.1/adapter.min.js"></script>
	<style>
	* {
	margin: 0;
	padding: 0;
	box-sizing: border-box;
	font-family: 'Arial', sans-serif;
	}

	body {
	background-color: #f0f2f5;
	color: #333;
	}

	.container {
	max-width: 1200px;
	margin: 0 auto;
	padding: 20px;
	}

	header {
	display: flex;
	justify-content: space-between;
	align-items: center;
	padding: 15px 0;
	border-bottom: 1px solid #ddd;
	margin-bottom: 20px;
	}

	.logo {
	font-size: 24px;
	font-weight: bold;
	color: #0066cc;
	}

	.controls {
	display: flex;
	gap: 10px;
	}

	button {
	padding: 8px 16px;
	background-color: #0066cc;
	color: white;
	border: none;
	border-radius: 4px;
	cursor: pointer;
	font-size: 14px;
	transition: background-color 0.3s;
	}

	button:hover {
	background-color: #0055aa;
	}

	button.red {
	background-color: #cc0000;
	}

	button.red:hover {
	background-color: #aa0000;
	}

	.disabled {
	background-color: #888;
	cursor: not-allowed;
	}

	.disabled:hover {
	background-color: #888;
	}

	.meeting-container {
	display: grid;
	grid-template-columns: 1fr 300px;
	gap: 20px;
	height: calc(100vh - 150px);
	}

	.video-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
	grid-auto-rows: 1fr;
	gap: 15px;
	height: 100%;
	overflow: auto;
	}

	.video-container {
	background-color: #222;
	border-radius: 8px;
	overflow: hidden;
	position: relative;
	}

	.video-container video {
	width: 100%;
	height: 100%;
	object-fit: cover;
	}

	.user-name {
	position: absolute;
	bottom: 10px;
	left: 10px;
	color: white;
	background-color: rgba(0, 0, 0, 0.5);
	padding: 4px 8px;
	border-radius: 4px;
	font-size: 14px;
	}

	.mic-status {
	position: absolute;
	top: 10px;
	right: 10px;
	color: white;
	padding: 4px;
	border-radius: 50%;
	}

	.sidebar {
	background-color: white;
	border-radius: 8px;
	display: flex;
	flex-direction: column;
	height: 100%;
	}

	.tabs {
	display: flex;
	border-bottom: 1px solid #ddd;
	}

	.tab {
	padding: 10px 15px;
	cursor: pointer;
	}

	.tab.active {
	color: #0066cc;
	border-bottom: 2px solid #0066cc;
	}

	.tab-content {
	flex-grow: 1;
	overflow: auto;
	padding: 15px;
	}

	.participants-list {
	list-style: none;
	}

	.participant {
	display: flex;
	align-items: center;
	padding: 8px 0;
	border-bottom: 1px solid #eee;
	}

	.participant-info {
	flex-grow: 1;
	}

	.chat-container {
	display: flex;
	flex-direction: column;
	height: 100%;
	}

	.messages {
	flex-grow: 1;
	overflow: auto;
	padding: 10px;
	}

	.message {
	margin-bottom: 10px;
	padding: 8px 12px;
	border-radius: 6px;
	max-width: 80%;
	}

	.message.received {
	background-color: #f1f1f1;
	align-self: flex-start;
	}

	.message.sent {
	background-color: #dcf8c6;
	align-self: flex-end;
	}

	.sender {
	font-size: 12px;
	color: #555;
	margin-bottom: 2px;
	}

	.chat-input {
	display: flex;
	padding: 10px;
	border-top: 1px solid #ddd;
	}

	.chat-input input {
	flex-grow: 1;
	padding: 8px 12px;
	border: 1px solid #ddd;
	border-radius: 4px;
	margin-right: 10px;
	outline: none;
	}

	.join-form {
	max-width: 400px;
	margin: 100px auto;
	background-color: white;
	padding: 30px;
	border-radius: 8px;
	box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
	}

	.form-group {
	margin-bottom: 20px;
	}

	label {
	display: block;
	margin-bottom: 8px;
	font-weight: bold;
	}

	input[type="text"],
	input[type="password"] {
	width: 100%;
	padding: 10px;
	border: 1px solid #ddd;
	border-radius: 4px;
	font-size: 16px;
	}

	.button-group {
	display: flex;
	justify-content: space-between;
	}

	.hidden {
	display: none;
	}

	/* 屏幕共享布局 */
	.screen-share {
	grid-column: span 2;
	height: 100%;
	background-color: #222;
	border-radius: 8px;
	overflow: hidden;
	position: relative;
	}

	.screen-share video {
	width: 100%;
	height: 100%;
	object-fit: contain;
	}

	.screen-share-label {
	position: absolute;
	top: 10px;
	left: 10px;
	color: white;
	background-color: rgba(0, 0, 0, 0.5);
	padding: 4px 8px;
	border-radius: 4px;
	font-size: 14px;
	}

	/* 响应式设计 */
	@media (max-width: 768px) {
	.meeting-container {
	grid-template-columns: 1fr;
	}

	.sidebar {
	margin-top: 20px;
	height: 300px;
	}
	}
	</style>
	</head>
	<body>
	<!-- 登录表单 -->
	<div class="join-form" id="joinForm">
	<h2 style="text-align: center; margin-bottom: 20px;">加入会议</h2>
	<div class="form-group">
	<label for="displayName">您的姓名</label>
	<input type="text" id="displayName" placeholder="请输入您的姓名">
	</div>
	<div class="form-group">
	<label for="roomId">会议 ID</label>
	<input type="text" id="roomId" placeholder="请输入会议 ID 或创建新会议">
	</div>
	<div class="button-group">
	<button id="createMeeting">创建会议</button>
	<button id="joinMeeting">加入会议</button>
	</div>
	</div>

	<!-- 会议主界面 (默认隐藏) -->
	<div class="container hidden" id="meetingContainer">
	<header>
	<div class="logo">视频会议</div>
	<div class="meeting-info">
	会议 ID: <span id="currentRoomId"></span>
	<button id="copyRoomId">复制</button>
	</div>
	<div class="controls">
	<button id="toggleAudio"><i class="fas fa-microphone"></i> 麦克风</button>
	<button id="toggleVideo"><i class="fas fa-video"></i> 摄像头</button>
	<button id="toggleScreen"><i class="fas fa-desktop"></i> 屏幕共享</button>
	<button id="leaveCall" class="red"><i class="fas fa-phone-slash"></i> 离开会议</button>
	</div>
	</header>

	<div class="meeting-container">
	<div class="video-grid" id="videoGrid">
	<!-- 视频将在这里动态添加 -->
	</div>

	<div class="sidebar">
	<div class="tabs">
	<div class="tab active" data-tab="participants">参会者</div>
	<div class="tab" data-tab="chat">聊天</div>
	</div>

	<div class="tab-content" id="participantsTab">
	<ul class="participants-list" id="participantsList">
	<!-- 参会者将在这里动态添加 -->
	</ul>
	</div>

	<div class="tab-content hidden" id="chatTab">
	<div class="chat-container">
	<div class="messages" id="messages">
	<!-- 消息将在这里动态添加 -->
	</div>
	<div class="chat-input">
	<input type="text" id="messageInput" placeholder="输入消息...">
	<button id="sendMessage">发送</button>
	</div>
	</div>
	</div>
	</div>
	</div>
	</div>

	<script>
	// DOM 元素
	const joinForm = document.getElementById('joinForm');
	const meetingContainer = document.getElementById('meetingContainer');
	const displayNameInput = document.getElementById('displayName');
	const roomIdInput = document.getElementById('roomId');
	const createMeetingBtn = document.getElementById('createMeeting');
	const joinMeetingBtn = document.getElementById('joinMeeting');
	const currentRoomIdSpan = document.getElementById('currentRoomId');
	const copyRoomIdBtn = document.getElementById('copyRoomId');
	const toggleAudioBtn = document.getElementById('toggleAudio');
	const toggleVideoBtn = document.getElementById('toggleVideo');
	const toggleScreenBtn = document.getElementById('toggleScreen');
	const leaveCallBtn = document.getElementById('leaveCall');
	const videoGrid = document.getElementById('videoGrid');
	const tabs = document.querySelectorAll('.tab');
	const tabContents = document.querySelectorAll('.tab-content');
	const participantsList = document.getElementById('participantsList');
	const messages = document.getElementById('messages');
	const messageInput = document.getElementById('messageInput');
	const sendMessageBtn = document.getElementById('sendMessage');

	// 状态变量
	let currentRoom = null;
	let localStream = null;
	let screenStream = null;
	let peerConnections = {};
	let dataChannels = {};
	let localAudioEnabled = true;
	let localVideoEnabled = true;

	// 模拟服务器功能 (实际应用中应该使用真实的信令服务器)
	const mockServer = {
	connections: {},

	connect(roomId, userId) {
	if (!this.connections[roomId]) {
	this.connections[roomId] = {};
	}
	this.connections[roomId][userId] = {
	onOffer: null,
	onAnswer: null,
	onIceCandidate: null,
	sendOffer: (targetId, offer) => {
	const target = this.connections[roomId][targetId];
	if (target && target.onOffer) {
	setTimeout(() => {
	target.onOffer(userId, offer);
	}, 100);
	}
	},
	sendAnswer: (targetId, answer) => {
	const target = this.connections[roomId][targetId];
	if (target && target.onAnswer) {
	setTimeout(() => {
	target.onAnswer(userId, answer);
	}, 100);
	}
	},
	sendIceCandidate: (targetId, candidate) => {
	const target = this.connections[roomId][targetId];
	if (target && target.onIceCandidate) {
	setTimeout(() => {
	target.onIceCandidate(userId, candidate);
	}, 100);
	}
	},
	sendMessage: (targetId, message) => {
	const target = this.connections[roomId][targetId];
	if (target && target.onMessage) {
	setTimeout(() => {
	target.onMessage(userId, message);
	}, 100);
	}
	},
	onMessage: null
	};

	return {
	userId,
	peers: Object.keys(this.connections[roomId]).filter(id => id !== userId)
	};
	},

	disconnect(roomId, userId) {
	if (this.connections[roomId]) {
	delete this.connections[roomId][userId];
	if (Object.keys(this.connections[roomId]).length === 0) {
	delete this.connections[roomId];
	}
	}
	}
	};

	// 生成随机 ID
	function generateId() {
	return Math.random().toString(36).substr(2, 9);
	}

	// 初始化媒体流
	async function initLocalStream() {
	try {
	localStream = await navigator.mediaDevices.getUserMedia({
	audio: true,
	video: true
	});

	// 创建本地视频元素
	const videoContainer = document.createElement('div');
	videoContainer.className = 'video-container';
	videoContainer.id = 'local-video-container';

	const video = document.createElement('video');
	video.srcObject = localStream;
	video.autoplay = true;
	video.muted = true; // 避免回声
	video.playsInline = true;

	const userName = document.createElement('div');
	userName.className = 'user-name';
	userName.textContent = displayNameInput.value + ' (你)';

	videoContainer.appendChild(video);
	videoContainer.appendChild(userName);

	videoGrid.appendChild(videoContainer);

	return true;
	} catch (error) {
	console.error('无法获取媒体流', error);
	alert('无法访问摄像头或麦克风，请确保它们已连接并授予访问权限。');
	return false;
	}
	}

	// 加入会议
	async function joinMeeting() {
	const displayName = displayNameInput.value.trim();
	let roomId = roomIdInput.value.trim();

	if (!displayName) {
	alert('请输入您的姓名');
	return;
	}

	if (!roomId) {
	alert('请输入会议 ID');
	return;
	}

	// 初始化本地媒体流
	const success = await initLocalStream();
	if (!success) return;

	// 连接到"服务器"
	const userId = generateId();
	const { peers } = mockServer.connect(roomId, userId);

	currentRoom = {
	id: roomId,
	userId,
	displayName
	};

	// 显示会议 ID
	currentRoomIdSpan.textContent = roomId;

	// 为每个已存在的对等端创建连接
	for (const peerId of peers) {
	createPeerConnection(peerId);
	}

	// 设置信令回调
	const connection = mockServer.connections[roomId][userId];

	connection.onOffer = async (peerId, offer) => {
	const pc = peerConnections[peerId] \|\| createPeerConnection(peerId);

	try {
	await pc.setRemoteDescription(new RTCSessionDescription(offer));

	const answer = await pc.createAnswer();
	await pc.setLocalDescription(answer);

	connection.sendAnswer(peerId, answer);
	} catch (error) {
	console.error('处理提议时出错', error);
	}
	};

	connection.onAnswer = async (peerId, answer) => {
	const pc = peerConnections[peerId];
	if (pc) {
	try {
	await pc.setRemoteDescription(new RTCSessionDescription(answer));
	} catch (error) {
	console.error('处理应答时出错', error);
	}
	}
	};

	connection.onIceCandidate = (peerId, candidate) => {
	const pc = peerConnections[peerId];
	if (pc) {
	try {
	pc.addIceCandidate(new RTCIceCandidate(candidate));
	} catch (error) {
	console.error('添加 ICE 候选时出错', error);
	}
	}
	};

	connection.onMessage = (peerId, message) => {
	displayMessage(peerId, message);
	};

	// 切换到会议界面
	joinForm.classList.add('hidden');
	meetingContainer.classList.remove('hidden');
	}

	// 创建 WebRTC 对等连接
	function createPeerConnection(peerId) {
	const pc = new RTCPeerConnection({
	iceServers: [
	{ urls: 'stun:stun.l.google.com:19302' },
	{ urls: 'stun:stun1.l.google.com:19302' }
	]
	});

	peerConnections[peerId] = pc;

	// 添加本地流到连接
	localStream.getTracks().forEach(track => {
	pc.addTrack(track, localStream);
	});

	// 创建数据通道
	const dataChannel = pc.createDataChannel(`chat-${peerId}`);

	dataChannel.onopen = () => {
	console.log(`与 ${peerId} 的数据通道已打开`);
	dataChannels[peerId] = dataChannel;
	};

	dataChannel.onclose = () => {
	console.log(`与 ${peerId} 的数据通道已关闭`);
	delete dataChannels[peerId];
	};

	// 处理 ICE 候选
	pc.onicecandidate = (event) => {
	if (event.candidate) {
	const connection = mockServer.connections[currentRoom.id][currentRoom.userId];
	connection.sendIceCandidate(peerId, event.candidate);
	}
	};

	// 处理远程流
	pc.ontrack = (event) => {
	const stream = event.streams[0];

	// 检查是否已经存在该对等方的视频元素
	const existingContainer = document.getElementById(`peer-${peerId}-container`);

	if (!existingContainer) {
	// 创建新的视频容器
	const videoContainer = document.createElement('div');
	videoContainer.className = 'video-container';
	videoContainer.id = `peer-${peerId}-container`;

	const video = document.createElement('video');
	video.srcObject = stream;
	video.autoplay = true;
	video.playsInline = true;

	const userName = document.createElement('div');
	userName.className = 'user-name';
	userName.textContent = '参会者'; // 实际应用中应该从信令服务器获取名称

	videoContainer.appendChild(video);
	videoContainer.appendChild(userName);

	videoGrid.appendChild(videoContainer);

	// 添加到参会者列表
	const participant = document.createElement('li');
	participant.className = 'participant';
	participant.id = `participant-${peerId}`;

	const participantInfo = document.createElement('div');
	participantInfo.className = 'participant-info';
	participantInfo.textContent = '参会者';

	participant.appendChild(participantInfo);
	participantsList.appendChild(participant);
	} else {
	// 更新现有视频元素
	const video = existingContainer.querySelector('video');
	if (video.srcObject !== stream) {
	video.srcObject = stream;
	}
	}
	};

	// 处理数据通道的接收
	pc.ondatachannel = (event) => {
	const receiveChannel = event.channel;

	receiveChannel.onmessage = (messageEvent) => {
	displayMessage(peerId, JSON.parse(messageEvent.data));
	};

	receiveChannel.onopen = () => {
	console.log(`接收到来自 ${peerId} 的数据通道`);
	dataChannels[peerId] = receiveChannel;
	};

	receiveChannel.onclose = () => {
	console.log(`来自 ${peerId} 的数据通道已关闭`);
	delete dataChannels[peerId];
	};
	};

	// 创建并发送提议
	pc.createOffer()
	.then(offer => pc.setLocalDescription(offer))
	.then(() => {
	const connection = mockServer.connections[currentRoom.id][currentRoom.userId];
	connection.sendOffer(peerId, pc.localDescription);
	})
	.catch(error => {
	console.error('创建提议时出错', error);
	});

	return pc;
	}

	// 切换麦克风
	function toggleAudio() {
	const audioTracks = localStream.getAudioTracks();

	if (audioTracks.length > 0) {
	const track = audioTracks[0];
	track.enabled = !track.enabled;
	localAudioEnabled = track.enabled;

	toggleAudioBtn.innerHTML = localAudioEnabled ?
	'<i class="fas fa-microphone"></i> 麦克风' :
	'<i class="fas fa-microphone-slash"></i> 麦克风 (已关闭)';

	toggleAudioBtn.classList.toggle('disabled', !localAudioEnabled);
	}
	}

	// 切换摄像头
	function toggleVideo() {
	const videoTracks = localStream.getVideoTracks();

	if (videoTracks.length > 0) {
	const track = videoTracks[0];
	track.enabled = !track.enabled;
	localVideoEnabled = track.enabled;

	toggleVideoBtn.innerHTML = localVideoEnabled ?
	'<i class="fas fa-video"></i> 摄像头' :
	'<i class="fas fa-video-slash"></i> 摄像头 (已关闭)';

	toggleVideoBtn.classList.toggle('disabled', !localVideoEnabled);

	// 更新本地视频容器的样式
	const localVideoContainer = document.getElementById('local-video-container');
	if (localVideoContainer) {
	localVideoContainer.style.backgroundColor = localVideoEnabled ? '#222' : '#444';
	}
	}
	}

	// 切换屏幕共享
	async function toggleScreen() {
	if (!screenStream) {
	try {
	screenStream = await navigator.mediaDevices.getDisplayMedia({
	video: true
	});

	// 替换所有连接中的视频轨道
	const videoTrack = screenStream.getVideoTracks()[0];

	Object.values(peerConnections).forEach(pc => {
	const senders = pc.getSenders();
	const sender = senders.find(s => s.track && s.track.kind === 'video');
	if (sender) {
	sender.replaceTrack(videoTrack);
	}
	});

	// 更新本地视频
	const localVideo = document.querySelector('#local-video-container video');
	if (localVideo) {
	localVideo.srcObject = screenStream;
	}

	toggleScreenBtn.innerHTML = '<i class="fas fa-desktop"></i> 停止共享';
	toggleScreenBtn.classList.add('red');

	// 处理屏幕共享结束
	videoTrack.onended = () => {
	stopScreenSharing();
	};
	} catch (error) {
	console.error('无法共享屏幕', error);
	alert('无法共享屏幕，请确保您已授予权限。');
	}
	} else {
	stopScreenSharing();
	}
	}

	// 停止屏幕共享
	function stopScreenSharing() {
	if (screenStream) {
	screenStream.getTracks().forEach(track => track.stop());
	screenStream = null;

	// 恢复摄像头视频
	const videoTrack = localStream.getVideoTracks()[0];
	if (videoTrack) {
	Object.values(peerConnections).forEach(pc => {
	const senders = pc.getSenders();
	const sender = senders.find(s => s.track && s.track.kind === 'video');
	if (sender) {
	sender.replaceTrack(videoTrack);
	}
	});

	// 更新本地视频
	const localVideo = document.querySelector('#local-video-container video');
	if (localVideo) {
	localVideo.srcObject = localStream;
	}
	}

	toggleScreenBtn.innerHTML = '<i class="fas fa-desktop"></i> 屏幕共享';
	toggleScreenBtn.classList.remove('red');
	}
	}

	// 离开会议
	function leaveCall() {
	// 关闭所有对等连接
	Object.values(peerConnections).forEach(pc => pc.close());
	peerConnections = {};

	// 关闭本地媒体流
	if (localStream) {
	localStream.getTracks().forEach(track => track.stop());
	localStream = null;
	}

	// 关闭屏幕共享流
	if (screenStream) {
	screenStream.getTracks().forEach(track => track.stop());
	screenStream = null;
	}

	// 从"服务器"断开连接
	if (currentRoom) {
	mockServer.disconnect(currentRoom.id, currentRoom.userId);
	currentRoom = null;
	}

	// 清空视频网格
	videoGrid.innerHTML = '';

	// 清空参会者列表
	participantsList.innerHTML = '';

	// 清空聊天消息
	messages.innerHTML = '';

	// 切换回登录界面
	meetingContainer.classList.add('hidden');
	joinForm.classList.remove('hidden');

	// 重置按钮状态
	toggleAudioBtn.innerHTML = '<i class="fas fa-microphone"></i> 麦克风';
	toggleAudioBtn.classList.remove('disabled');

	toggleVideoBtn.innerHTML = '<i class="fas fa-video"></i> 摄像头';
	toggleVideoBtn.classList.remove('disabled');

	toggleScreenBtn.innerHTML = '<i class="fas fa-desktop"></i> 屏幕共享';
	toggleScreenBtn.classList.remove('red');
	}

	// 发送聊天消息
	function sendMessage() {
	const messageText = messageInput.value.trim();

	if (messageText && currentRoom) {
	const message = {
	text: messageText,
	sender: currentRoom.displayName,
	timestamp: new Date().toISOString()
	};

	// 显示自己的消息
	displayMessage(currentRoom.userId, message);

	// 发送消息给所有对等端
	Object.keys(dataChannels).forEach(peerId => {
	const channel = dataChannels[peerId];
	if (channel.readyState === 'open') {
	channel.send(JSON.stringify(message));
	}
	});

	// 清空输入框
	messageInput.value = '';
	}
	}

	// 显示聊天消息
	function displayMessage(senderId, message) {
	const messageElement = document.createElement('div');
	messageElement.className = `message ${senderId === currentRoom?.userId ? 'sent' : 'received'}`;

	const senderElement = document.createElement('div');
	senderElement.className = 'sender';
	senderElement.textContent = message.sender;

	const textElement = document.createElement('div');
	textElement.textContent = message.text;

	messageElement.appendChild(senderElement);
	messageElement.appendChild(textElement);

	messages.appendChild(messageElement);
	messages.scrollTop = messages.scrollHeight;
	}

	// 复制会议 ID
	function copyRoomId() {
	const roomId = currentRoomIdSpan.textContent;
	navigator.clipboard.writeText(roomId)
	.then(() => {
	alert('会议 ID 已复制到剪贴板');
	})
	.catch(err => {
	console.error('无法复制会议 ID', err);
	alert('无法复制会议 ID，请手动选择并复制');
	});
	}

	// 切换标签页
	function switchTab(tabName) {
	tabs.forEach(tab => {
	tab.classList.toggle('active', tab.dataset.tab === tabName);
	});

	tabContents.forEach(content => {
	content.classList.toggle('hidden', content.id !== `${tabName}Tab`);
	});
	}

	// 事件监听
	createMeetingBtn.addEventListener('click', () => {
	roomIdInput.value = generateId();
	joinMeeting();
	});

	joinMeetingBtn.addEventListener('click', () => {
	joinMeeting();
	});

	toggleAudioBtn.addEventListener('click', toggleAudio);
	toggleVideoBtn.addEventListener('click', toggleVideo);
	toggleScreenBtn.addEventListener('click', toggleScreen);
	leaveCallBtn.addEventListener('click', leaveCall);
	copyRoomIdBtn.addEventListener('click', copyRoomId);

	tabs.forEach(tab => {
	tab.addEventListener('click', () => {
	switchTab(tab.dataset.tab);
	});
	});

	sendMessageBtn.addEventListener('click', sendMessage);

	messageInput.addEventListener('keypress', (event) => {
	if (event.key === 'Enter') {
	sendMessage();
	}
	});

	// 阻止表单提交刷新页面
	document.addEventListener('submit', (event) => {
	event.preventDefault();
	});
	</script>

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	</body>
	</html>