var validateForm = null;   var num = 2;   $(document).ready(function(){    var lastCommunAddTr = $("#workDay");    $("#add").click(function() { 　　　　　    //复制一行                var tr = $("#workDay").clone();                tr.find("#dayMsg1").get(0).style.display="none";                  tr.find("#remarkMsg1").get(0).style.display="none";                tr.find("#msg1").get(0).style.display="none";                 tr.find("#day1").get(0).value="";                 tr.find("#dayMsg1").get(0).id="dayMsg"+num;                 tr.find("#day1").get(0).id="day"+num;                 tr.find("#msg1").get(0).id="msg"+num;                 tr.find("#remark1").get(0).value="春节";                tr.find("#state1").get(0).id="state"+num;               tr.find("#remark1").get(0).id="remark"+num;               tr.find("#remarkMsg1").get(0).id="remarkMsg"+num;                tr.show();                tr.insertAfter(lastCommunAddTr);                lastCommunAddTr = tr;                num++;             });             //删除一行             $("#workDayDel").click(function() {                 var delIndexs = new Array(0);                 $(".trWorkDay:gt(0)").each(function(i) {                  if($(this).find("#ck").get(0).checked == true){                   delIndexs.splice(delIndexs.length,0,i);                      $(this).remove();                     }                      $(".trWorkDay").each(function() {                  lastCommunAddTr = $(this);                 });                 });             });   });