javascript - Caching jQuery variables -

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i read if referring same dom element on , on in function better cache them in local variable :

var btn = $('#clearbtn');

i have followed necessary when accessing object have used $(btn).somemethod(); although can access directly btn.somemethod();

i need know whether have negative impact ?

there's no point in passing jquery object through jquery constructor. it's wasteful. if dollar sign looks nice you, prepend variable name , use $btn in place of $(btn):

var $btn = $('#clearbtn');

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