[BUG] basic in example, broswer message must be sent twice

[Iteravse]

Describe the bug
① in app.js 45line toId is not defined!
②using example basic, broswer every send message need two times it worked, why it happend?
server only recived An odd number of times message,the phenomena is every stable

Note that if a bug is a browser-relative please report it at the neffos.js repository instead. Thanks!
chrome and firefox

To Reproduce
Steps to reproduce the behavior:
reproduce:https://github.com/kataras/neffos/tree/master/_examples/basic