jquery-checked

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$('.SALES_ORDER_PO_DESC_CONFIRM').prop('checked', true);

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$('.SALES_ORDER_INV_DESC_CONFIRM' ).each(function( index ) {this.checked =(!this.checked)})



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s=""
dl=""
if ($('#ID').is(":checked")) {
           s=s+dl+"ID"
           dl=","
}

$("input[type='checkbox']").val();
Or if you have set a class or id for it, you can:

$('#check_id').val();
$('.check_class').val();
Also you can check whether it is checked or not like:

if ($('#check_id').is(":checked"))
{
  // it is checked
}


$('#some_id').attr('checked') ? 1 : 0;