JS案例：Socket聊天室（两种方式）
一.socket轮询（每隔一段时间向后端请求一次，增加服务器压力）:
由于socket连接时采用ws/wss协议，页面必须放在服务器端，所以首先用node产生一个静态文件夹，方便通过IP直接访问
static.js:
const express = require('express');//这里要引入express
const app = express();
const path = require('path');
app.use('/main', express.static(path.join(__dirname, './html')));//设置静态文件夹
app.listen(2048, () => {//端口号不能与socket监听的端口号一样
console.log('static 2048 Server Start~');
})在html界面做一些简单的布局以及socket数据请求：
index.html：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
<style>
#text {
width: 350px;
height: 30px;
}
#netName {
width: 150px;
height: 30px;
}
</style>
</head>
<body>
<textarea name="" id="msg" cols="80" rows="30" readonly></textarea><br />
<input id="netName" type="text" placeholder="名称" />
<input id="text" type="text" placeholder="消息" />
<button οnclick="clickHandler()">发送</button>
<script>
setInterval(sendMsg, 1000); //这里做轮询请求
function sendMsg(data) { //封装WebSocket请求函数
if (!data) {
data = {
err: 1
}; //根据参数判断是否符合数据规范
}
var ws = new WebSocket("ws://192.168.1.4:1024"); //使用ws协议对1024端口进行请求
ws.onopen = function () {
ws.send(JSON.stringify(data));
};
ws.onmessage = getData;
}
function getData(evt) { //将请求成功后返回的数据接收
var received_msg = evt.data;
var val = JSON.parse(evt.data).join("\n");
msg.value = val;
}
document.addEventListener("keyup", e => { //回车键发送
if (e.keyCode !== 13) return;
clickHandler(e);
});
function clickHandler() { //点击Button时将数据发送到服务端
if (netName.value.trim().length == 0 || text.value.trim().length == 0)
return;
var obj = {
err: 0,
netName: netName.value,
msg: text.value
};
sendMsg(obj);
text.value = ""; //每次发送后将内容制空
}
</script>
</body>
</html>Client.js（客户端）
const WebSocket = require('ws');//这里引入一个模块ws
const ws = new WebSocket('ws://192.168.1.4:1024');//对1024端口进行监听
ws.on('open', function() {
console.log('Client is listening on port 1024');
});
ws.on('message', function(msg) {
ws.send(msg);//获取到前端传来的数据后，直接向服务端传递
});
ws.on('close',function(){
console.log('Client close')
}); Server.js
const static = require('./static')//引入刚刚创建的static静态目录
const client = require('./client')//引入客户端
const WebSocket = require('ws');
let list = [];
const wss = new WebSocket.Server({//对1024端口进行监听
port: 1024
}, () => {
console.log('Server is listening on port 1024');
});
wss.on('connection', function (ws) {
ws.on('message', function (msg) {//对数据过滤和处理
if(!JSON.parse(msg).err){
list.push(JSON.parse(msg).netName + ' 说: ' + JSON.parse(msg).msg)
}
ws.send(JSON.stringify(list));//将数据传到前端
});
});
二.socketio长链接（与轮询不同，使前后端通过事件处理机制时刻保持连接状态）
同样产生一个静态文件夹：
static.js:
const express = require('express');
const app = express();
const path = require('path');
app.use('/main', express.static(path.join(__dirname, './static')));
app.listen(2048, () => {
console.log('static 2048 Server Start~');
})index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="X-UA-Compatible" content="ie=edge" />
<title>Document</title>
<style>
#text {
width: 350px;
height: 30px;
}
#netName {
width: 150px;
height: 30px;
}
</style>
<script src="./socket.io.js"></script>
<!-- 首先用npm下载socketio并且使用socket.io-client中的socket.io.js -->
</head>
<body>
<textarea name="" id="msg" cols="80" rows="30" readonly></textarea><br />
<input id="netName" type="text" placeholder="名称" />
<input id="text" type="text" placeholder="消息" />
<button οnclick="clickHandler()">发送</button>
<script>
var socket = io.connect('http://192.168.1.4:1024'); //建立http连接
var list = [] //本地聊天记录缓存
function clickHandler() {
if (netName.value.trim().length == 0 || text.value.trim().length == 0)
return; //过滤输入框
var obj = {
netName: netName.value,
msg: text.value
};
list.push(obj.netName + ' 说: ' + obj.msg)
socket.emit('send', obj)//触发send事件
getData(list);
text.value = "";
}
socket.on('msg', function (msg) {//添加msg监听事件
list = msg;
getData(list)
})
function getData(arr) {//将聊天记录放至area标签
msg.value = arr.join('\n');
}
</script>
</body>
</html>Server.js:
const static = require("./static");//引入刚刚创建的static静态目录
let list = [];//聊天记录缓存
var express = require("express");
var app = express();
var server = require("http").Server(app);
const io = require("socket.io")(server);
io.on("connection", function(client) {
client.on("send", data => {//添加send监听事件
list.push(data.netName + " 说: " + data.msg);//将前端事件传过来的参数进行处理
sendList(list, client);//将数据通过事件发送到前端
});
});
function sendList(list, target) {
target.broadcast.emit("msg", list);//触发msg事件
}
server.listen(1024, "192.168.1.4", () => {
console.log("Connect Success At 1024");
});
