javascript - How to get li chechbox checked status in jquery -

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how li checkbox checked status in jquery.

i want one, throw me undefined. 

$('#ul'+$id+' li:nth-child('+_index+') span input:checkbox').attr("checked")

can out of one.

use .is(':checked') on jquery object.

$('#ul'+$id+' li:nth-child('+_index+') span input:checkbox').is(':checked');

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