Swift 实现生成七牛 token 中 base64 编码与在线实例不一致

func JSONStringify(value: AnyObject,prettyPrinted:Bool = false) -> String{

        let options = prettyPrinted ? NSJSONWritingOptions.PrettyPrinted : NSJSONWritingOptions(rawValue: 0)


        if NSJSONSerialization.isValidJSONObject(value) {

            do{
                let data = try NSJSONSerialization.dataWithJSONObject(value, options: options)
                if let string = NSString(data: data, encoding: NSUTF8StringEncoding) {
                    return string as String
                }
            }catch {

                print("error")
                //Access error here
            }

        }
        return ""

    }


        let jsonObject: [String : AnyObject] = ["deadline":1448340828,"scope":"Blog",]

        let jsonString = JSONStringify(jsonObject)

        let Data = jsonString.dataUsingEncoding(NSUTF8StringEncoding)

        let encoded = Data?.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.Encoding64CharacterLineLength)


        let demoStr = "{\"scope\":\"Blog\",\"deadline\":1448340828}"

        let demoData = demoStr.dataUsingEncoding(NSUTF8StringEncoding)

        let demoEncoded = demoData?.base64EncodedStringWithOptions(NSDataBase64EncodingOptions.Encoding64CharacterLineLength)

        print(encoded)

        print(demoEncoded)