session 获取不到

[Hellengo]

你好，我们的登录返回如下，并且我们的服务端目前不接收json串，所以request_type只能使用Data，
请问如何获取登录接口中的session呢
{
"message": "welcome back",
"code": 0,
"result": {
"user_info": {
"province": "北京市",
"weight": 77,
"userId": "56680e0000b0a9f1b6d4f080",
"sex": "1",
"userIntId": 507037,
"updatedAt": "2015-12-22T02:29:09.000Z",
"id": "56680e0000b0a9f1b6d4f080",
"createdAt": "2015-12-09T11:18:24.000Z",
"avatarImage": "http://ac-1xzez6xi.clouddn.com/V9I7g3Pqs9SfhO8H6iyzMrD",
"objectId": "56680e0000b0a9f1b6d4f080",
"area": "朝阳区",
"nickname": "Hellengo",
"isOk": 4,
"email": "420942603@qq.com",
"username": "420942603@qq.com",
"edited": true,
"weeklyDistance": 30234.580078125,
"city": "北京市",
"height": 180,
"achievements": [],
"monthlyDistance": 39231.53506088257,
"totalDistance": 39231.5350608826,
"lastestCyclingTime": "2015-12-18T04:22:37.000Z",
"avatar": "http://ac-1xzez6xi.clouddn.com/V9I7g3Pqs9SfhO8H6iyzMrD"
},
"sessionId": "3t1algkuav3st9mmlaqwxv2l87amiqkx",
"userId": "56680e0000b0a9f1b6d4f080",
"needUpdate": false
}
}