新建一個 GameObject 把指令碼拖上去 

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class DebugShow : MonoBehaviour {
    public bool Log = true;
    private bool isShowLog;//是否顯示日誌,
    public KeyCode keyOpenLog = KeyCode.O;//按鍵開啟/關閉日誌
    private Vector2 m_scroll;
    public GUIStyle labelStyle;//日誌的OnGUI樣式設定

    internal void OnEnable()
    {
        isShowLog = true;//當指令碼開啟，是否可以顯示日誌， Log = True;//這個變數也必須為True
        Application.logMessageReceived += HandleLog;//註冊Unity的日誌回撥
    }

    internal void OnDisable()
    {
        Application.logMessageReceived -= HandleLog;//去掉Unity的日誌回撥
    }

    private string m_logs;
    /// <summary>
    /// /// </summary>    
    /// /// <param name="logString">錯誤資訊</param>    /// 
    /// <param name="stackTrace">跟蹤堆疊</param>    /// 
    /// <param name="type">錯誤型別</param>    
    void HandleLog(string logString, string stackTrace, LogType type)
    {
        string[] splitStr = stackTrace.Split('\n');
        string strType = "";
        switch (type)
        {//給日誌型別加顏色
            case LogType.Error:
                strType = "<color=red>" + type.ToString() + "</color>";
                break;
            case LogType.Assert:
                break;
            case LogType.Warning:
                strType = "<color=yellow>" + type.ToString() + "</color>";
                break;
            case LogType.Log:
                strType = "<color=white>" + type.ToString() + "</color>";
                break;
            case LogType.Exception:
                break;
            default:
                break;
        }
        strType = strType.Length == 0 ? type.ToString() : strType;//如果沒有日誌型別，那麼就賦值一個型別
        string strLog = "【—" + strType + "—】: \n" + logString + "\n" + splitStr[0] + "\t\n" + splitStr[1] + "\t\n\t\t<——————分割線——————>\n";
        m_logs = strLog + m_logs;
        if (m_logs.Length>1024*8)
        {//如果字元超出長度是會報錯的，所以超出限制一下長度
            m_logs = "";
            m_logs = strLog + m_logs;
        }
    }
    
    void OnGUI()
    {
        if (!Log)
            return;
        if (isShowLog)
        {
            m_scroll = GUILayout.BeginScrollView(m_scroll);
            if (GUILayout.Button("清空日誌"))
            {
                m_logs = "";
            }
            GUILayout.Label(m_logs, labelStyle);
            GUILayout.EndScrollView();
        }
    }

    void Update()
    {
        if (Input.GetKeyUp(keyOpenLog))
        {
            isShowLog = !isShowLog;
        }
    }
}