基于websocket搭建简易群聊

1.前端HTML

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
<div style=" 600px;">
    <input type="text" id="username">
    <button onclick="login()">登录聊天室</button>
</div>
<br>
<div style=" 600px;">
    给：<input type="text" id="to_user">
    发送：<input type="text" id="msg">
    <button onclick="send_msg()">发送</button>
</div>
<br>
<div id="chat_list" style=" 600px;height: 300px;"></div>

</body>
<script type="application/javascript">
    var ws = null;

    function login() {
        var username = document.getElementById("username").value;
        // 打印当前登录用户名
        console.log(username);
        // 注意ws/，斜线不要忘记写
        ws = new WebSocket("ws://192.168.13.21:5300/ws/" + username);
        // 打印创建的socket链接
        console.log(ws);
        ws.onmessage = function (data) {
            console.log(data.data);
            var recv_msg = JSON.parse(data.data);
            var ptag = document.createElement("p");
            ptag.innerText = recv_msg.from_user + ":" + recv_msg.msg;
            document.getElementById("chat_list").appendChild(ptag);
        }
    }

    function send_msg() {
        var to_user = document.getElementById("to_user").value;
        var msg = document.getElementById("msg").value;
        var send_str = {
            "to_user": to_user,
            "msg": msg
        };
        ws.send(JSON.stringify(send_str));
    }
</script>
</html>

2.后端PYTHON

from flask import Flask,render_template,request
from geventwebsocket.handler import WebSocketHandler
from geventwebsocket.websocket import WebSocket
from gevent.pywsgi import WSGIServer
import json

app=Flask(__name__)
user_socket_list = []
user_socket_dict = {}

@app.route("/ws/<username>")
def ws(username):
    print('当前登录账号:',username)
    user_socket = request.environ.get("wsgi.websocket") #type:WebSocket
    if user_socket:
        user_socket_dict[username] = user_socket
    else:
        pass
    while 1:
        msg = user_socket.receive() 
        msg_dict = json.loads(msg)
        msg_dict["from_user"] = username
        to_user = msg_dict.get("to_user")
        u_socket = user_socket_dict.get(to_user) # type:WebSocket
        u_socket.send(json.dumps(msg_dict))

@app.route("/")
def index():
    return render_template("ws.html")

if __name__ == '__main__':
    http_serv = WSGIServer(("0.0.0.0",5300),app,handler_class=WebSocketHandler)
    http_serv.serve_forever()

需要借助2个浏览器实现