using UnityEngine; using UnityEngine.Networking; using System.Collections; using System.Collections.Generic; using LitJson; public class Example : MonoBehaviour { public UnityEngine.UI.Text resultText; void Start() { StartCoroutine(PostRequest()); } IEnumerator PostRequest() { string url = "your_post_url_here"; string postData = "your_post_data_here"; // Send POST request UnityWebRequest request = new UnityWebRequest(url, "POST"); byte[] bodyRaw = System.Text.Encoding.UTF8.GetBytes(postData); request.uploadHandler = new UploadHandlerRaw(bodyRaw); request.downloadHandler = new DownloadHandlerBuffer(); request.SetRequestHeader("Content-Type", "application/json"); yield return request.SendWebRequest(); // Parse response if (request.result == UnityWebRequest.Result.Success) { string json = request.downloadHandler.text; JsonData data = JsonMapper.ToObject(json); string result = "Return Code: " + data["returnCode"] + "\n"; result += "Return Message: " + data["returnMessage"] + "\n"; result += "Data: " + data["data"] + "\n"; resultText.text = result; } else { Debug.Log(request.error); } } }修改代码

根据你提供的代码，可能会有以下几个问题：

1. 在 `UnityWebRequest` 类的构造函数中，第一个参数应该是请求的 URL 地址，而不是字符串 `"POST"`。你需要将 `url` 变量作为第一个参数传递给构造函数。

2. 在 `UnityWebRequest` 类的构造函数中，第二个参数应该是请求的 HTTP 方法，即 `"POST"` 或 `"GET"` 等。由于你的请求是 POST 请求，因此你需要将字符串 `"POST"` 作为第二个参数传递给构造函数。

3. 在发送请求之前，你需要设置请求的超时时间。可以使用 `request.timeout` 属性来设置超时时间，单位为秒。

4. 在请求头中，你设置了 `Content-Type` 为 `"application/json"`。如果你的请求数据不是 JSON 格式，那么你需要将 `Content-Type` 设置为相应的类型，例如 `"application/x-www-form-urlencoded"`。

下面是修改后的代码：

using UnityEngine;
using UnityEngine.Networking;
using System.Collections;
using System.Collections.Generic;
using LitJson;

public class Example : MonoBehaviour
{
    public UnityEngine.UI.Text resultText;

    void Start()
    {
        StartCoroutine(PostRequest());
    }

    IEnumerator PostRequest()
    {
        string url = "your_post_url_here";
        string postData = "your_post_data_here";

        // Send POST request
        UnityWebRequest request = new UnityWebRequest(url, "POST");
        byte[] bodyRaw = System.Text.Encoding.UTF8.GetBytes(postData);
        request.uploadHandler = new UploadHandlerRaw(bodyRaw);
        request.downloadHandler = new DownloadHandlerBuffer();
        request.SetRequestHeader("Content-Type", "application/json");
        request.timeout = 10;  // Set request timeout to 10 seconds
        yield return request.SendWebRequest();

        // Parse response
        if (request.result == UnityWebRequest.Result.Success)
        {
            string json = request.downloadHandler.text;
            JsonData data = JsonMapper.ToObject(json);
            string result = "Return Code: " + data["returnCode"] + "\n";
            result += "Return Message: " + data["returnMessage"] + "\n";
            result += "Data: " + data["data"] + "\n";
            resultText.text = result;
        }
        else
        {
            Debug.Log(request.error);
        }
    }
}