如何使用jQuery检索DOM的副本，仅在内存中进行修改

Is it possible to use jQuery to grab a specific part of the DOM into a variable as a jQuery Object upon which I can then perform some action(s) without affecting the DOM itself. When I say I don't want to affect the DOM, I do not want the changes to be visible to the user, but cannot simply be hidden via CSS.Is it possible to use jQuery to grab a specific