从返回的json格式的data数据内随机取得n个

var arr=[
    {
      "ceo":"张无忌",
      "conmpany":"阿里妈妈有限公司",
      "address":"上海市淮海路1888号508"
    },
    {
      "ceo":"马云",
      "conmpany":"阿里巴巴有限公司",
      "address":"上海市陆家嘴浦东大道1800号"
    },
    {
      "ceo":"雷军",
      "conmpany":"小小米亚",
      "address":"上海市淮海路568号508"
    },
    {
      "ceo":"马画藤",
      "conmpany":"腾讯公司",
      "address":"上海市淮海路1200号512"
    },
    {
      "ceo":"劉德華",
      "conmpany":"腾讯公司",
      "address":"上海市淮海路666号508"
    },
    {
      "ceo":"周星驰",
      "conmpany":"华谊公司",
      "address":"上海市淮海路1256号508"
    },
    {
      "ceo":"张学友",
      "conmpany":"畅想公司",
      "address":"上海市浦东大道666号508"
    },
    {
      "ceo":"莫文蔚",
      "conmpany":"你好公司",
      "address":"上海市淮海路6856号508"
    },
    {
      "ceo":"赵本山",
      "conmpany":"二人转公司",
      "address":"上海市徐汇区66886号508"
    }
  ];
function getRandom(n){
    var newarr=[],id,leng=arr.length;
    for(var i=0;i<n;i++){
        id=Math.floor(Math.random()*leng);
        newarr.push(arr[id]);
    }
    return newarr;
}
getRandom(3);