$.each(jsonarray, function(i, obj) {
     troptions += "<tr data-sort-field-ftime=\""+obj.paiming+"\">";     
     troptions += "<td>"+(Number(obj.cdsPrem)/unitnow).toFixed(dotnow)+"</td>";
     troptions += "<td>"+(Number(obj.cdjPrem)/unitnow).toFixed(dotnow)+"</td>";
     troptions += "<td>"+(Number(obj.sumPrem)/unitnow).toFixed(dotnow)+"</td>";
     troptions += "<td>"+obj.paiming+"</td>";
     troptions += "</tr>";
   });

//排序处理
 function changepm(){
  var sortType=$("#pm").val();
  var $trList = $("#ta tbody > tr");//获取现有tr对象
  //冒泡排序  
  for (var i = 0; i < $trList.length - 1; i++) {
   for (var j = 0; j < $trList.length - 1 - i; j++) {
    var value1 = parseInt($trList[j].attributes["data-sort-field-ftime"].nodeValue); 
    var value2 = parseInt($trList[j + 1].attributes["data-sort-field-ftime"].nodeValue);
    if (sortType === "asc" "#ta > tbody").empty());
 }