u3d www json http

using LitJson;
using System.Collections;
using UnityEngine;

public class MessageJson
{
    public bool status;
    public string data;
    public string code;
}

public class HttpMgr : MonoBehaviour
{
    // Use this for initialization
    void Start () {
        StartCoroutine(YeildPost());
    }

    IEnumerator YeildPost()
    {
        WWWForm form = new WWWForm();
        form.AddField("mobile", "123");
        form.AddField("password", "234");
        WWW www = new WWW("xxx", form);
        yield return www;
        if (www.error != null)
        {
            Debug.Log("error is login:" + www.error);
        }
        else
        {
            Debug.Log("request ok login: " + www.text);
            MessageJson jd = JsonMapper.ToObject<MessageJson>(www.text);
            Debug.Log(jd.status);
        }
    }
}