Websocket实现视频弹幕功能
时间: 2023-11-28 11:04:20 浏览: 95
web视频弹幕
WebSocket技术可以用来实现实时弹幕功能。以下是一个简单的WebSocket弹幕示例:
1. 前端代码
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Websocket弹幕</title>
<style>
#barrage {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
overflow: hidden;
pointer-events: none;
}
.barrage-item {
position: absolute;
top: 0;
white-space: nowrap;
font-size: 20px;
color: white;
text-shadow: 1px 1px 2px black;
}
</style>
</head>
<body>
<canvas id="barrage"></canvas>
<script>
const canvas = document.getElementById('barrage');
const ctx = canvas.getContext('2d');
const width = canvas.width = window.innerWidth;
const height = canvas.height = window.innerHeight;
let barrageList = [];
// 连接websocket服务器
const ws = new WebSocket('ws://localhost:8080');
ws.onmessage = (event) => {
const data = JSON.parse(event.data);
barrageList.push({
text: data.text,
x: width,
y: Math.random() * height,
color: data.color
});
};
function draw() {
ctx.clearRect(0, 0, width, height);
for (let i = 0; i < barrageList.length; i++) {
const item = barrageList[i];
ctx.fillStyle = item.color;
ctx.fillText(item.text, item.x, item.y);
item.x -= 3;
}
barrageList = barrageList.filter(item => item.x > -ctx.measureText(item.text).width);
requestAnimationFrame(draw);
}
draw();
</script>
</body>
</html>
```
2. 后端代码
```javascript
const WebSocket = require('ws');
const wss = new WebSocket.Server({ port: 8080 });
wss.on('connection', (ws) => {
console.log('connected');
ws.on('message', (message) => {
console.log(`received: ${message}`);
wss.clients.forEach(client => {
if (client.readyState === WebSocket.OPEN) {
client.send(message);
}
});
});
});
```
3. 使用方法
用户在前端页面上输入文本和颜色,点击发送按钮后,将文本和颜色发送给后端WebSocket服务器,服务器接收到消息后将消息广播给所有连接的客户端,客户端接收到消息后将消息添加到弹幕列表中,并在画布上绘制弹幕。
这是一个最基本的弹幕实现,实际中还需要考虑弹幕的速度、字体大小、弹幕屏蔽等问题。
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