socket.io Events整理

服务器端

初始化：

const options = { /* ... */ };
const io = require('socket.io')(options);
io.on('connection', socket => { 
    /* ... */
    socket.on('error',()=>{});
    socket.on('disconnecting',()=>{});
    socket.on('disconnect',()=>{});
});
io.listen(3000);

事件：

disconnect：断开连接
error：发生错误
disconnecting：正在断开

客户端

初始化：

import io from 'socket.io-client';
const socket = io();
console.log(socket.connected); // false
socket.on('connect', () => {
  console.log(socket.connected); // true
});
socket.on('disconnect', () => {
  console.log(socket.connected); // false
});

事件：

connect：连接成功          [Fired upon connection (including a successful reconnection)]
disconnect：断开连接       [Fired upon disconnection]
connect_error：连接错误    [Fired upon a connection error]
connect_timeout：连接超时  [Fired upon a connection timeout]
error：发生错误            [Fired when an error occurs]
reconnect：成功重连        [Fired upon a successful reconnection]
reconnect_attempt：尝试重连[Fired upon an attempt to reconnect]
reconnecting：正在重连     [Alias for “reconnect_attempt”]
reconnect_error：重连错误  [Fired upon a reconnection attempt error]
reconnect_failed：重连失败 [Fired when the client couldn’t reconnect within reconnectionAttempts]
ping：发送ping消息事件     [Fired when a ping is sent to the server]
pong：接受到pong消息       [Fired when a pong is received from the server]

事件触发举例：

当失去连接时，事件触发顺序为：disconnect->reconnecting（多次尝试建立连接）->reconnect->connect。

Reference

• https://socket.io/