Swift3.0 Any数据类型转Json

func toolsChangeToJson(info: Any) -> String{
    //首先判断能不能转换
    guard JSONSerialization.isValidJSONObject(info) else {
        PrintLog("json转换失败")
        return ""
    }
    //如果设置options为JSONSerialization.WritingOptions.prettyPrinted，则打印格式更好阅读
    let jsonData = try? JSONSerialization.data(withJSONObject: info, options: [])

    if let jsonData = jsonData {
        let str = String(data: jsonData, encoding: String.Encoding.utf8)
        return str ?? ""
    }else {
       return ""
    }
}