问剑道UI网格:一对多上的分组

EN

var name_titles = [
  {name: "Tony Stark", title: ["CEO", "Super Hero"]},
  {name: "Elon Musk", title: "CEO"}
];

var title_names = $.map(name_titles,function(item){
  if (item.title) {
    if (item.title.constructor === Array) {
      return $.map(item.title,function(title) {
        return {name:item.name, title:title}
      })
    }
    else {
      return item;
    }
  }
  else {
    return null;
  }
});    

$("#grid").kendoGrid({
  dataSource: {
    data: title_names,
    group: { field: "title" }
  }
});