js生成、删除表格方法

 <script language="javascript" type="text/javascript">
        var index = 0;
        function addplan() {
            if (validate2()) {
                insert(index);
                var text = "";               
                 index++;
                text += "<table id='tab' style='100%; height;25px;' border='1' cellpadding='0' cellspacing='0'>";
                text += "<tr style='height:20px;'>";
                text += "<td style='90px'>" + (index) + "</td>";
               
                var select1=document.getElementById("DropDownList3");
                text += "<td style='90px;'><label id='txtbegintime'>" + select1.options[select1.selectedIndex].innerText + "</label></td>";
               
                var select2=document.getElementById("DropDownList2");
                text += "<td style='90px;'><label id='txtendtime'>" + select2.options[select2.selectedIndex].innerText + "</label></td>";
               
                var select3=document.getElementById("DropDownList1");
                text += "<td style='90px;'><label id='txtNumber'>" + select3.options[select3.selectedIndex].innerText + "</label></td>";
               
                var select5=document.getElementById("txtNumber1")
                text += "<td style='90px;'><label id='txtyuPrice'>" +select5.options[select5.selectedIndex].innerText + "</label></td>";
              
                var select4=document.getElementById("txtBianma");
                text += "<td style='90px;'><label id='txtKCNumber'>" +select4.options[select4.selectedIndex].innerText + "</label></td>";
               
               
               
                text += "<td style='90px;'><label id='txtPrice'>" + document.getElementById("txtKCNumber1").value + "</label></td>";
                text += "<td style='90px;'><label id='txtPrice'>" + document.getElementById("txtyuPrice1").value + "</label></td>";
                text += "<td style='90px;'><label id='txtPrice'>" + document.getElementById("txtPrice1").value + "</label></td>";
               
                text += "<td style='90px;'><label id='txtBei'>" + document.getElementById("txtBei1").value + "</label></td>";
                //var select6=document.getElementById("ddlscs");
                //text +="<td style='90px;'><lable id='txtscs'>"+select6.options[select6.selectedIndex].innerText+"</lable></td>";
                text +="<td style='90px;'><lable id='txtscs'>厂商名称</lable></td>";
               
               
                text+="<td style='90px;'><input type='button' value='删除' onclick='deleteRow(this)'></td>"
                text += "<td style='90px;'></td>";
                text += "</tr></table>";

                document.getElementById("div_play1").innerHTML += text;
               
                document.getElementById("txtBianma").value = "";
                document.getElementById("txtNumber1").value = "";
                  document.getElementById("txtKCNumber1").value = "";
                document.getElementById("txtyuPrice1").value = "";
                document.getElementById("txtPrice1").value = "";
               
             
                document.getElementById("txtBei1").value = "";
               

            }
        }

        function insert(index) {
            var HTYPE = document.getElementById("DropDownList3").value;
            var PRODUCTNAME = document.getElementById("DropDownList2").value;
            var PRODUCTTYPE = document.getElementById("DropDownList1").value;
            var PRODUCTSBM = document.getElementById("txtNumber1").value;
            var PRODUCTSNUMBER = document.getElementById("txtBianma").value;
           
            var PROFUCTSKCNUMBER=document.getElementById("txtKCNumber1").value;
            var PRODUCTSPRICE = document.getElementById("txtyuPrice1").value;
            var PRODUCTSMONEY = document.getElementById("txtPrice1").value;
            var BEIZU=document.getElementById("txtBei1").value;

            var text = HTYPE + "," + PRODUCTNAME + "," + PRODUCTTYPE + "," + PRODUCTSBM + "," + PRODUCTSNUMBER + ","+PROFUCTSKCNUMBER+"," + PRODUCTSPRICE + "," + PRODUCTSMONEY+","+BEIZU;
            document.getElementById("listvalue").value += text + "@";
        }

        function deleteRow(index){
        var index = index.parentNode.parentNode.rowIndex;
        var tab = document.getElementById('tab');
        tab.deleteRow(index);
        }

        function validate2() {

            var txtName1 = document.getElementById("DropDownList3").value;
            var txtGUIG1 = document.getElementById("txtGUIG1").value;
            var txtNumber1 = document.getElementById("txtNumber1").value;

            if (txtName1 == "" || txtName1.length == 0) {
                alert("物品名称不可以为空!");
                return false;
            } else if (txtGUIG1 == "" || txtGUIG1.length == 0) {
                alert("规格不能为空!");
                return false;
            } else if (txtNumber1 == "" || txtNumber1.length == 0) {
                alert("数量不能为空!");
                return false;
            } else {

                return true;

            }

return  true;
        }
       
        //计算单条记录金额
        function  SuanQian()
        {
       
          var money=document.getElementById("txtyuPrice1").value;
          var SL=document.getElementById("txtKCNumber1").value;
         
          var ZQ=money*SL;
         
          document.getElementById("txtPrice1").value=ZQ;
       
        }
       

    </script>