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在连接成功后先执行了类似await这样的异步等待操作，可能会导致socket.on('disconnect')未执行的问题
io.on('connection', async socket => {
let res = await sockets.find({id: socket.id)})
await sockets.remove({id: socket.id})
socket.on('private message', function (from, msg) {
console.log('I received a private message by ', from, ' saying ', msg)
socket.on('disconnect', reason => {
// console.log('下线：' + reason)
delete wsUsers[query.id]
socket.emit('onlineCount', io.eio.cliensCount)
...
调整一下它们的执行顺序，可以解决
io.on('connection', async socket => {
socket.on('private message', function (from, msg) {
console.log('I received a private message by ', from, ' saying ', msg)
socket.on('disconnect', reason => {
// console.log('下线：' + reason)
delete wsUsers[query.id]
socket.emit('onlineCount', io.eio.cliensCount)
let res = await sockets.find({id: socket.id)})
await sockets.remove({id: socket.id})
...
