📅  最后修改于: 2022-03-11 15:01:35.135000             🧑  作者: Mango
Explain event delegation :
“Js event listeners fire not only on a single DOM element
but on all its descendents”
The idea is that if we have a lot of elements handled in a
similar way, then instead of assigning a handler to each of
them – we put a single handler on their common ancestor.