6.获取主分类列表
### 6.获取主分类列表
** POST为了兼容老版接口所以用POST表单
** /lib/category/main
返回值
```
{
"result": true,
"errno": 0,
"msg": "成功",
"data":[
{
"label_id": 709,
"label_pid": 0,
"label_name": "建筑",
"hot": 100000008,
"create_time": 1393418472,
"hide": 1
},
...
]
}
```