$(elem).prop() 요소객체 속성

요소객체 DOM 속성을 반환,설정

elem.checked	true (Boolean) Will change with checkbox state
$(elem).prop("checked")	true (Boolean) Will change with checkbox state
elem.getAttribute("checked")	"checked" (String) Initial state of the checkbox; does not change
$(elem).attr("checked")(1.6)	"checked" (String) Initial state of the checkbox; does not change
$(elem).attr("checked")(1.6.1+)	"checked" (String) Will change with checkbox state
$(elem).attr("checked")(pre-1.6)	true (Boolean) Changed with checkbox state