JavaScript后端数据重组为JSON数组的正确与错误方式

[{
  name: 'host:10.1.6.49',
  data: [
    [1470641461000, 5],
    [1470642581000, 4],
    [1470643701000, 2],
    [1470647341000, 3]
  ]
}, {
  name: 'host:10.3.34.18',
  data: [
    [1470641461000, 2],
    [1470642581000, 2],
    [1470643701000, 1],
    [1470647341000, 4]
  ]
}, {
  name: 'host:10.2.2.22',
  data: [
    [1470641461000, 3],
    [1470642581000, 2],
    [1470643701000, 6],
    [1470647341000, 4]
  ]
},{
  name: 'host:10.1.110.96',
  data: [
    [1470641461000, 1],
    [1470642581000, 8],
    [1470643701000, 1],
    [1470647341000, 1]
  ]
},{
  name: 'host:10.2.2.87',
  data: [
    [1470641461000, 7],
    [1470642581000, 3],
    [1470643701000, 6],
    [1470647341000, 5]
  ]
}]

var backendData = data.result;
var resultList = new Array();
var curHost = "";
var oneHostDataList = new Array();
for (var i in backendData) {
  var host = backendData[i].host;
  if (host != curHost) {
    if(i != 0) {
      var item = new Object();
      item.name = curHost;
      item.data = oneHostDataList;
      resultList.push(item);
    }
    oneHostDataList = new Array();
    curHost = host;
  }
  else {
    var dot = new Array();
    dot.push(backendData[i].currentTime * 1000);
    dot.push(backendData[i].taskNum);
    oneHostDataList.push(dot);
  }
}
var item = new Object();
item.name = curHost;
item.data = oneHostDataList;
resultList.push(item);
$scope.data = JSON.stringify(resultList);

var backendData = data.result;
var resultList = [];
var curHost = "";
var oneHostDataList = new Array();
for (var i in backendData) {
  var host = backendData[i].host;
  if (host != curHost) {
    if(i != 0) {
      var item = {
        name: curHost,
        data: oneHostDataList
      };
      resultList.push(item);
    }
    oneHostDataList = new Array();
    curHost = host;
  }
  else {
    var dot = new Array();
    dot.push(backendData[i].currentTime * 1000);
    dot.push(backendData[i].taskNum);
    oneHostDataList.push(dot);
  }
}
var item = new Object();
item.name = curHost;
item.data = oneHostDataList;
resultList.push(item);
$scope.data = resultList;