我使用电子制作了一个聊天室。但是,当我向服务器发送消息并从那里向用户显示消息时,出于某种原因,该消息会多次显示。示例:我发送 -> "hello" 消息将显示一次,当我发送第二条消息时 ->"Hello server" 消息将显示两次,当我发送第三条消息时 ->"ok" 此消息将显示三遍。第四条信息会显示4次等
这是 renderer.js 代码:
const ws = new WebSocket("ws://127.0.0.1:5000");
ws.addEventListener('open', function(event){
ws.send('hello server');
console.log("data sent");
});
function send_data(){
console.log("button clicked");
ws.send(document.getElementById("input_text").value);
ws.addEventListener('message', function(event){
console.log("server send something");
let mess=event.data;
console.log(mess);
update_chat(mess);
});
};
function update_chat(mess){
const div = document.createElement('div');
div.classList.add('message');
div.innerHTML = `okwpegjwpgj said: ${mess}`;
document.querySelector('.chat_messages').appendChild(div);
}
这是 server.js 代码:
const WebSocket = require('ws');
let broadcast_msg;
const PORT = 5000;
const wss = new WebSocket.Server({
port: PORT
});
wss.on("connection", ws =>{
ws.on('message', function incoming(message){
broadcast_msg=message;
console.log('received: ', message);
ws.send(message);
});
});
console.log("Server is liestening on port " + PORT);
答案 0 :(得分:2)
因为您在每次 send_data() 调用时都添加了 addEventListener('message')。
添加一次事件侦听器并将其从 send_data() 方法中删除。您无需在每次发送数据时都添加新的事件侦听器。
ws.addEventListener('message', function(event){
console.log("server send something");
let mess=event.data;
console.log(mess);
update_chat(mess);
});
function send_data(){
console.log("button clicked");
ws.send(document.getElementById("input_text").value);
};
答案 1 :(得分:-1)
将您的 renderer.js 文件更改为:
const ws = new WebSocket("ws://127.0.0.1:5000");
ws.addEventListener('open', function(event){
ws.send('hello server');
console.log("data sent");
});
ws.addEventListener('message', function(event){
console.log("server send something");
let mess=event.data;
console.log(mess);
update_chat(mess);
});
function send_data(){
console.log("button clicked");
ws.send(document.getElementById("input_text").value);
};
function update_chat(mess){
const div = document.createElement('div');
div.classList.add('message');
div.innerHTML = `okwpegjwpgj said: ${mess}`;
document.querySelector('.chat_messages').appendChild(div);
}