js创建元素笔记

function showAreaData(weekId){var currTR = event.srcElement.parentNode;if(hasData==true && lastCell == weekId){for(var s = 1 ; s <= n ; s ++){currTR.parentNode.removeChild(currTR.nextSibling);}hasData = false;}else{if(hasData == true && lastCell != weekId){for(var s = 1 ; s <= n ; s ++){lastTR.parentNode.removeChild(lastTR.nextSibling);}hasData = false;}var productType = form.productType.value;var businessType = form.businessType.value;var serviceLevel = form.serviceLevel.value;var customGroup = form.customGroup.value;var areaId = form.areaNo.value;//alert(areaId+" "+weekId+" "+productType+" "+businessType+" "+serviceLevel+" "+customGroup);var xmlhttp = createXHR();  xmlhttp.onreadystatechange = function(){  if(xmlhttp.readyState == 4){        if(xmlhttp.status == 200){        var responseText = xmlhttp.responseText;                var trs = responseText.split("<tr>");                for(var i = 1 ; i < trs.length; i ++ ){        n = i;        var tr = trs[i].split("</tr>")[0];        //alert(tr);        var tds = tr.split('<td>');        //创建tr        var trNode = document.createElement("<tr id='TR_"+weekId+""+i+"' style='display:block;'></tr>");                for(var j = 1 ; j < tds.length; j ++){        var td = tds[j].split("</td>")[0];        //alert(td);        //创建td并添加到tr        var tdNode = document.createElement("<td align='right'></td>");        tdNode.innerHTML = td;        trNode.appendChild(tdNode);        }        //追加tr        currTR.parentNode.insertBefore(trNode,currTR.nextSibling);        }        }    }  }      var URL = "TotalAnalysisWeek.action?flag=getAreaData&weekId="+weekId+"&productType="+productType    +"&businessType="+businessType+"&serviceLevel="+serviceLevel+"&customGroup="+customGroup    +"&areaId="+areaId;        xmlhttp.open("post",URL,false);        xmlhttp.send(null);    hasData = true;lastCell = weekId;}lastTR = currTR;}