为什么ssh中list转换成json打印如下，为什么有的值拿不出来呢？
[
{
"author":"123",
"ncontent":"<p><img alt=\"\" src=\"http://localhost:8080/my_demo/upload/c19f7d70-0c4f-4ad2-bb4f-c43134416aa8.jpg\" style=\"height:338px; width:450px\" /></p>\r\n",
"nid":14,
"ntime":1390552852000,
"ntitle":"123",
"ntype":1,
"pset":[],
"user":{
"newSet":[{"$ref":"$[0]"},{
"author":"123",
"ncontent":"<p><img alt=\"\" src=\"http://localhost:8080/my_demo/upload/8ccdb606-34b8-44a6-84a0-8b65f896d1b5.png\" style=\"height:198px; width:198px\" /></p>\r\n\r\n<p>&nbsp;</p>\r\n\r\n<p>二维码..............</p>\r\n",
"nid":2,
"ntime":1389773914000,
"ntitle":"123",
"ntype":1,
"pset":[],
"user":{"$ref":"$[0].user"}
},{
"author":"123",
"ncontent":"<p><img alt=\"\" src=\"http://localhost:8080/my_demo/upload/ba6782e1-4093-4940-91b9-bf420b0355c1.jpg\" style=\"height:338px; width:450px\" /></p>\r\n\r\n<p>&nbsp;</p>\r\n\r\n<p>&nbsp;</p>\r\n\r\n<p>呵呵！！！！</p>\r\n",
"nid":3,
"ntime":1389777538000,
"ntitle":"我们的无奈",
"ntype":2,
"pset":[],
"user":{"$ref":"$[0].user"}
}],
"tname":"hh",
"uid":2,
"uname":"123",
"upass":"123"
}
},
{
"author":"admin",
"ncontent":"<p>sdafsdf</p>\r\n",
"nid":13,
"ntime":1390552743000,
"ntitle":"asdf",
"ntype":2,
"pset":[],
"user":{
"newSet":[{
"author":"admin",
"ncontent":"<p>hello!!!</p>\r\n\r\n<p>my so_co!who are you?</p>\r\n\r\n<p>&nbsp;</p>\r\n\r\n<p><img alt=\"\" src=\"http://localhost:8080/my_demo/upload/476df1fe-2709-4bcb-9d30-5eafb98de330.jpg\" style=\"height:500px; width:800px\" /></p>\r\n\r\n<p>&nbsp;</p>\r\n\r\n<p>sdfasdf</p>\r\n\r\n<p>a</p>\r\n\r\n<p>&nbsp;</p>\r\n\r\n<p>&nbsp;</p>\r\n\r\n<p><img alt=\"\" src=\"http://localhost:8080/my_demo/upload/2570ec4b-b8d6-47fe-bd02-65ab69248519.jpg\" style=\"height:169px; width:800px\" /></p>\r\n",
"nid":1,
"ntime":1389773787000,
"ntitle":"picture",
"ntype":2,
"pset":[],
"user":{"$ref":"$[1].user"}
},{
"author":"admin",
"ncontent":"<p><img alt=\"\" src=\"http://localhost:8080/my_demo/upload/b81ed85f-3740-4364-a18e-6bde2e2966c0.jpg\" style=\"height:500px; width:800px\" /></p>\r\n",
"nid":10,
"ntime":1390552568000,
"ntitle":"cao",
"ntype":1,
"pset":[],
"user":{"$ref":"$[1].user"}
},{
"author":"1",
"ncontent":"<p>I believe !!!</p>\r\n\r\n<p><img alt=\"\" src=\"http://localhost:8080/my_demo/upload/7f80e404-0bc8-478f-a134-ffad5b0238ed.jpg\" style=\"height:450px; width:800px\" /></p>\r\n\r\n<p>&nbsp;</p>\r\n\r\n<p>sony!!!!</p>\r\n",
"nid":4,
"ntime":1389778140000,
"ntitle":"add",
"ntype":1,
"pset":[],
"user":{"$ref":"$[1].user"}
},{"$ref":"$[1]"},{
"author":"asddd",
"ncontent":"<p>asdfasdfasd</p>\r\n",
"nid":6,
"ntime":1390189602000,
"ntitle":"fasdfasdfas",
"ntype":1,
"pset":[],
"user":{"$ref":"$[1].user"}
},{
"author":"admi