response: { //定义后端 json 格式，详细参见官方文档
   code: 0,
   msg: "",
   count: 1000,
   data: []
  }

JSONObject obj=new JSONObject();
 
//前台通过key值获得对应的value值
 
obj.put("code", 0);
 
obj.put("msg", "");
 
obj.put("count",1000);
 
obj.put("data",list);
 
// array.add(obj);
 
return obj.toString();

 public Map<String, Object> queryUserList(Integer curr, Integer limit) {
  PageHelper.startPage(Integer.valueOf(curr), Integer.valueOf(limit));
  List<Users> list = loginMapper.queryUserList();
  long total = ((Page) list).getTotal();
  Map<String, Object> map = new HashMap<>();
  map.put("code", 0);
  map.put("msg", "");
  map.put("count",total);
  map.put("data",list);
  return map;
 }