需求分析：

在Unity中有时我们获取接口数据需要传入token才可以获取到数据，下面看看我们怎样可以获取到token

功能实现：

using System;
using System.Collections;
using System.Text;
using UnityEngine;
using UnityEngine.Networking;

public class SendData
{
    public string username;
    public string password;
}
public class GetToken : MonoBehaviour
{
    public static string token;
    SendData send = new SendData();
    private void Awake()
    {
        send.username = "admin";
        send.password = "123456";
        var jsonstring = JsonUtility.ToJson(send);//将账户密码转为json格式
        StartCoroutine(PostUrl("你的获取token接口", jsonstring));
    }
    IEnumerator PostUrl(string url, string postData)
    {
        byte[] Bytes = Encoding.UTF8.GetBytes(postData);//将string转化为字节
        UnityWebRequest webRequest = new UnityWebRequest(url, "POST");//声明webrequest,请求类型为post
        webRequest.uploadHandler = new UploadHandlerRaw(Bytes);//上传字节
        webRequest.downloadHandler = new DownloadHandlerBuffer();//接收字节
        webRequest.SetRequestHeader("Content-Type", "application/json");//定义请求头值
        yield return webRequest.SendWebRequest();//开始通信
        if (webRequest.result == UnityWebRequest.Result.ConnectionError) Debug.Log(webRequest.error);//如果失败，输出失败原因
        else
        {
            token = webRequest.downloadHandler.text;
            token = GetTokens(token).Trim('"');//获取到的token
            Debug.Log(token);

        }
    }
    private static string GetTokens(string message)
    {
        string[] tokendata = token.Split(new string[] { "token" }, StringSplitOptions.RemoveEmptyEntries);
        tokendata = tokendata[1].Split(new char[] { ':', '}' });
        return token = tokendata[1];
    }
}