SOURCE

var list = [{
  group: '111',
  value: 'b',
  order: 2
},
{
  group: '222',
  value: 'b',
  order: 1
},
{
  group: '111',
  value: 'a',
  order: 5
},
{
  group: '222',
  value: 'a',
  order: 3
},
{
  group: '111',
  value: 'a',
  order: 4
},
{
  group: '222',
  value: 'a',
  order: 3
},
{
  group: '111',
  value: 'a',
  order: 7
}];
var chartlist = [];
//console.log(JSON.stringify(chartlist));
/*
for (var item of list) {
  if (!chartlist[item.group]) {
    chartlist[item.group] = []
  }
  chartlist[item.group].push(item);
}
*/
var groupName = [];
for (var item of list) {
  if(groupName.indexOf(item.group)==-1){
    groupName.push(item.group)
  }
}
console.log(groupName);



for(var itemname of groupName){
  var array = [];
  for(var item1 of list){
    if(item1.group == itemname){
      array.push(item1)
    }
  }
  chartlist.push(array)
}  
console.log(JSON.stringify(chartlist));

//console.log(JSON.stringify(chartlist));



for (var row of Object.keys(chartlist)) {
  chartlist[row] = _.sortBy(chartlist[row], "order");
}
console.log(JSON.stringify(chartlist));
//document.write(JSON.stringify(chartlist));