event handling - How can I implement server notifications in JavaScript and what are the pros/cons of each method? -

event handling - How can I implement server notifications in JavaScript and what are the pros/cons of each method? -

i implement force notifications javascript client-side application. have read many articles on web show different possibilities (websockeds, ajax poll/long poll, server-sent events...) , i'm unsure on how should implement them. experience of javascript front-end developer, possible ways (currently available) implement this, , pros/cons of using each possibility?

(i seek each 1 of them, don't have much experience in field, don't have experience know problems arise in each implementation, i.e. # of open connections, latency, etc.)

javascript event-handling