Does jQuery cache any selectors- Does jQuery do any kind of caching of “selectors”?

problem ：

For example, will the first piece of code perform a full search twice, or is it smart enough to cache results if no DOM changes have occurred? for example , Whether the first code will perform two full searches , Or if it doesn't happen DOM change , Is it smart enough to cache results ？

if ($("#navbar .heading").text() > "") {  $("#navbar .heading").hide();}

and and

var $heading = $("#navbar .heading");if ($heading.text() > "") {  $heading.hide();}

If the selector is more complex I can imagine it's a non-trivial hit. If the selector is more complex , I can imagine it is an extraordinary hit .

---

Solution ：

Reference resources ： https://stackoom.com/en/question/1Dv7