From 0c3ccc5c2fa0c454e2579193cb1a6f8816164ae2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=BD=95=E5=86=A0=E5=B3=B0?= <hevinci@hotmail.com>
Date: Wed, 17 Sep 2025 16:49:21 +0800
Subject: [PATCH] =?UTF-8?q?refactor:=20=E9=80=82=E9=85=8D=E5=BC=95?=
 =?UTF-8?q?=E6=93=8E=E7=89=88=E6=9C=AC?=
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---
 .../Operation/internal/UnityDownloadFileOperation.cs | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/UnityDownloadFileOperation.cs b/Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/UnityDownloadFileOperation.cs
index 80ad5a9e..cb022017 100644
--- a/Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/UnityDownloadFileOperation.cs
+++ b/Assets/YooAsset/Runtime/FileSystem/DefaultCacheFileSystem/Operation/internal/UnityDownloadFileOperation.cs
@@ -50,21 +50,27 @@ namespace YooAsset
             if (_watchDogAborted)
                 return;
 
+#if UNITY_2020_3_OR_NEWER
+            double realtimeSinceStartup = UnityEngine.Time.realtimeSinceStartupAsDouble;
+#else
+            double realtimeSinceStartup = UnityEngine.Time.realtimeSinceStartup;
+#endif
+
             if (_watchDogInit == false)
             {
                 _watchDogInit = true;
                 _lastDownloadBytes = 0;
-                _lastGetDataTime = UnityEngine.Time.realtimeSinceStartupAsDouble;
+                _lastGetDataTime = realtimeSinceStartup;
             }
 
             if (_webRequest.downloadedBytes != _lastDownloadBytes)
             {
                 _lastDownloadBytes = _webRequest.downloadedBytes;
-                _lastGetDataTime = UnityEngine.Time.realtimeSinceStartupAsDouble;
+                _lastGetDataTime = realtimeSinceStartup;
             }
             else
             {
-                double deltaTime = UnityEngine.Time.realtimeSinceStartupAsDouble - _lastGetDataTime;
+                double deltaTime = realtimeSinceStartup - _lastGetDataTime;
                 if (deltaTime > _fileSystem.DownloadWatchDogTime)
                 {
                     _watchDogAborted = true;