Jquery: How to select only within a selection?

var parent = $("#jcontent");
var button1 = parent(".button1")

How to select .button开发者_C百科1 knowing it is inside the parent while not reusing #jcontent?

I need to do this because I only want to pass the parent as parameter and to be able to cache it which is faster.

---

Another alternative

var parent = $("#jcontent"); 
var button1 = $(".button1", parent) ;

---

var button1 = parent.find(".button1");