是否可以安全地将JavaScript代码发送到用户的浏览器？

Is it possible to send javascript code to a client, and have it send back information to a server, without the user being able to intercept it, see it, or alter it. As far as I know this is not possible, but I am unsure about certain realtime protocols like socket/ajax. Could somebody intercept a web socket?Is it possible to send javascript code to a cli