var target = event.target

//为radio绑定单击事件
$(document).on("click",".round-table #table1 input[name='rtype']",function(event) {
//取消checkbox禁用
$(".round-table #table2 input[name='num[]']").attr("disabled",false);//全部取消禁用
event = event || window.event;
var target = event.target; //这个就是触发事件的控件
var num = $(target).attr('displayNo');
});