iOS -将JSON字符串转换为JSON对象后更改的十进制值

let jsonString = "{\"name\":\"John\", \"age\":30, \"city\":\"New York\"}"
if let jsonData = jsonString.data(using: .utf8) {
    do {
        let jsonObject = try JSONSerialization.jsonObject(with: jsonData, options: [])
        if let jsonDict = jsonObject as? [String: Any] {
            // 修改JSON对象的十进制值
            jsonDict["age"] = 31
            
            // 将修改后的JSON对象转换回JSON字符串
            let modifiedJsonData = try JSONSerialization.data(withJSONObject: jsonDict, options: [])
            if let modifiedJsonString = String(data: modifiedJsonData, encoding: .utf8) {
                print(modifiedJsonString)
            }
        }
    } catch {
        print("JSON serialization failed: \(error)")
    }
}