javascript - jquery & css target nth li with varaible instead of a number -

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i using jquery add class li in ul. code:

$('ul').children('li:eq( '2' )').addclass('active');

how can replace "2" variable dynamic? code below not work. think syntax issue advice?

var count = 2; $('ul').children('li:eq( 'count' )').addclass('active');

you need concatenate variable.

$('ul').children('li:eq( ' + count +' )').addclass('active');

however can use $.fn.eq()

reduce set of matched elements 1 @ specified index.

 $('ul').children('li').eq(count).addclass('active');

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