How to implement an online medical consultation system using WebSocket and JavaScript

How to use WebSocket and JavaScript to implement an online medical consultation system

Introduction:
With the development of the Internet, people's demand for online medical consultation has gradually increased. The traditional medical system usually requires people to go to the hospital in person and then wait in line to see a doctor, which is time-consuming and inconvenient. The online medical consultation system allows you to contact doctors directly through the Internet, which is convenient and fast, reducing waiting time. This article will introduce how to use WebSocket and JavaScript to implement an online medical consultation system, and provide specific code examples.

1. What is WebSocket?
WebSocket is a full-duplex communication protocol that allows two-way communication over a long-lasting connection. Compared with the traditional HTTP protocol, WebSocket can establish a persistent connection between the client and the server to achieve real-time two-way data transmission. This makes WebSocket an ideal choice for implementing online medical consultation systems.

2. Use WebSocket to establish a connection
In JavaScript, you can use the WebSocket object to establish a connection with the server. The following is a simple example showing how to use WebSocket to establish a connection to a server:

const socket = new WebSocket('ws://example.com');

socket.onopen = function() {
  console.log('连接已建立');
};

socket.onmessage = function(event) {
  console.log('接收到消息：', event.data);
};

socket.onclose = function() {
  console.log('连接已关闭');
};

socket.onerror = function(error) {
  console.error('发生错误：', error);
};

In the above example, we use the constructor of the WebSocket object to create a WebSocket instance and specify the server to connect to. address. Then, we can monitor the status of the connection and the received messages through events such as onopen, onmessage, onclose and onerror.

3. Implementing an online medical consultation system
In order to implement an online medical consultation system, we need to use WebSocket to establish real-time communication between doctors and patients. The following is a simple example showing how to implement an online medical consultation system using WebSocket and JavaScript:

1. Patient-side code:

   const socket = new WebSocket('ws://example.com');
   
   socket.onopen = function() {
     sendMessage('患者A请求咨询');
   };
   
   socket.onmessage = function(event) {
     displayMessage(event.data);
   };
   
   socket.onclose = function() {
     console.log('连接已关闭');
   };
   
   socket.onerror = function(error) {
     console.error('发生错误：', error);
   };
   
   function sendMessage(message) {
     socket.send(message);
   }
   
   function displayMessage(message) {
     document.getElementById('messageBoard').innerText += '
   ' + message;
   }

In the patient-side code, we send the patient's consultation request through WebSocket and display the message returned by the server in the messageBoard element on the page.

2. Doctor-side code:

   const socket = new WebSocket('ws://example.com');
   
   socket.onopen = function() {
     console.log('连接已建立');
   };
   
   socket.onmessage = function(event) {
     processMessage(event.data);
   };
   
   socket.onclose = function() {
     console.log('连接已关闭');
   };
   
   socket.onerror = function(error) {
     console.error('发生错误：', error);
   };
   
   function processMessage(message) {
     if (message === '患者A请求咨询') {
    sendMessage('医生B接受咨询');
     }
   }
   
   function sendMessage(message) {
     socket.send(message);
   }

   In the doctor-side code, we listen to consultation requests from patients and give responses based on the actual situation . In this example, if a consultation request is received from Patient A, Doctor B will reply to accept the consultation and send the reply back to the server via WebSocket.

   Summary:
   By using WebSocket and JavaScript, we can easily implement an online medical consultation system. WebSocket provides two-way communication capabilities, allowing doctors and patients to consult and respond in real time. The above sample code is for demonstration purposes only. The actual system needs to be designed and developed according to specific needs, but the real-time communication model based on WebSocket can provide a good foundation for the implementation of the online medical consultation system.

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