返回结果示例（默认为json格式数据，utf-8编码）：
{
"errcode":"0",
"ems_info":{
"kind":"中通",
"num":"111111111111",
"des":[],
"state":"3",
"adate":"2014-07-08 09:20",
"sign":"拍照签收"
},
"track_data":{
"data":[
{"datetime":"2014-07-08 09:20:44","place":[],"info":"哈尔滨学府三部"},
{"datetime":"2014-03-26 20:58:40","place":"惠州市区","info":"惠州市区分捡"},
{"datetime":"2014-03-26 13:14:44","place":"番禺市桥","info":"番禺市桥分捡"},
{"datetime":"2014-03-26 10:26:48","place":"靖江","info":"快件到达无锡中转部"},
{"datetime":"2014-03-25 10:45:13","place":"嘉兴","info":"快件到达嘉兴中转部"},
{"datetime":"2014-03-24 15:47:31","place":"南山蛇口","info":"南山蛇口分捡"},
{"datetime":"2014-03-23 14:40:23","place":"广州","info":"快件离开广州石井"},
{"datetime":"2014-03-09 16:49:27","place":"福州鼓楼一部","info":"福州鼓楼一部"},
{"datetime":"2014-03-06 17:26:11","place":"广州海珠","info":"广州海珠公司分捡"},
{"datetime":"2014-03-04 08:00:57","place":"温州","info":"快件离开温州解放街"},
{"datetime":"2014-03-04 06:22:53","place":"襄樊中转","info":"快件到达襄樊"},
{"datetime":"2014-02-28 02:38:27","place":"杭州操作部","info":"快件离开城南区"},
{"datetime":"2014-02-28 00:50:59","place":"外高桥南部","info":"快件到上海"},
{"datetime":"2014-02-27 17:50:56","place":"珠江新城","info":"珠江新城分捡"},
{"datetime":"2014-02-25 19:28:30","place":"惠阳","info":"惠阳 梁东明分捡"},
{"datetime":"2014-02-17 15:39:50","place":"白云金贵","info":"白云金贵分捡"},
{"datetime":"2014-01-03 14:59:49","place":"江门江海","info":"江门江海分捡"},
{"datetime":"2014-01-03 11:24:49","place":"荔湾","info":"荔湾公司分捡"},
{"datetime":"2014-01-01 15:57:51","place":"惠阳","info":"惠阳进入公司分捡"},
{"datetime":"2014-01-01 10:19:47","place":"福鼎","info":"福鼎公司分捡"}
]
}
}
