单项选择题
A.bind(type,[data],function(eventObject))B.$(‘#demo’).click(function(){})C.$(‘#demo’).on(‘click’,function(){})D.$(‘#demo’).one(‘click’,function(){})
A.bindB.mousedownC.changeD.on
A.$("input:radio").get(0).attr("checked",true);B.$(input[type=radio])[1].attr(checked ,true);C.$(input[type=radio]),eq(1).attr(checked ,true);D.$("sex:radio").eq(1).attr("checked",true);