I used to use nodejs to start the local service debugging interface of http. Today, because I need to debug websocket, I use nodejs to start the local service. I will share a method of using nodejs to start the websocket service locally!
Starting the local websocket service requires nodejs-websocket, so let's initialize a node project first!
1. Open the terminal, first create a js file, and then use npm init -y to initialize the package management. You will get a folder like this.
2. Install nodejs-websocket: npm install nodejs-websocket
3. Write code in index.js
// 引入nodejs-websocket
const ws = require('nodejs-websocket');
// 定义监听的host地址跟port端口
const host = '127.0.0.1',
port = 8000;
// 创建ws服务
const service = ws.createServer((conn) => {
// 定义测试数据
const data = ['消息1', '消息2', '消息3'];
conn.on('text', (message) => {
// 当收到消息的时候就开始定时推送
console.log('message', message);
setInterval(() => {
// 随机推送message里的内容
conn.sendText(data[(Math.random() * 2).toFixed(0)]);
}, 5 * 1000);
});
}).listen(port, host, () => {
console.log('service---connection---');
});
4. Write an html page to test whether it is successful
<script>
window.onload = () => {
if ('WebSocket' in window) {
// 创建websocket连接
let ws = new WebSocket('ws://127.0.0.1:8000');
// 成功连接的时候推送一条消息，此时服务端就可以开始推送数据了
ws.onopen = () => {
console.log('websocket链接成功---');
ws.send('success');
}
ws.onmessage = (message) => {
let data = message.data;
console.log('获取websocket消息-', data);
}
ws.onerror = () => {
console.error('websocket链接失败');
}
} else {
console.error('当前设备不支持websocket');
};
};
</script>
5. Enter node index.js in the terminal to start our service, and then open the index.html page to see that the connection is successful and start receiving messages.
