[Javascript] json length object add

var bookmark = {};

var marknum = '000';
var markval= '{"param_no":"CNTS-00052461629","curVol":1,"srcpath":"\\192.168.100.40/ImgNcldbY/2007/KJU200606112","vols_count":256,"title":"여기까지","msg":"여기까지 읽음"}';

var count = Object.keys(bookmark).length;
 console.log(count);

bookmark[marknum]=markval;

$.each(bookmark,function(key,value) {
  console.log('key:'+key+', value:'+value); 
  //if(key=='VOL_2')alert(value);
});

count = Object.keys(bookmark).length;
  console.log(count);

 

 

sample

 

{"000":{"param_no":"CNTS-00052461629","curVol":1,"srcpath":"\\192.168.100.40/ImgNcldbY/2007/KJU200606112","vols_count":256,"title":"여기까지","msg":"여기까지 읽음"},
   "001":{"param_no":"CNTS-00052461629","curVol":2,"srcpath":"\\192.168.100.40/ImgNcldbY/2007/KJU200606112","vols_count":258,"title":"여기까지3","msg":"여기까지 읽음1"},
   "003":{"param_no":"CNTS-00052461629","curVol":2,"srcpath":"\\192.168.100.40/ImgNcldbY/2007/KJU200606112","vols_count":258,"title":"여기까지3","msg":"여기까지 읽음3"}}