fix: 修复ExperimentPanel按钮无响应问题，新增OnExperimentBackClicked回调，清理遗留的BtnFixationBack显隐逻辑

Assets/Scenes/main.unity

@@ -213,6 +213,7 @@ GameObject:
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@@ -411,6 +436,29 @@ Transform:
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@@ -550,7 +598,7 @@ GameObject:
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@@ -652,6 +700,82 @@ CanvasRenderer:
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   m_GameObject: {fileID: 188350342}
   m_CullTransparentMesh: 1
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+  m_TagString: Untagged
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@@ -2174,6 +2298,126 @@ SphereCollider:
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@@ -2186,6 +2430,7 @@ GameObject:
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@@ -2279,6 +2524,29 @@ Transform:
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@@ -5215,7 +5603,7 @@ MonoBehaviour:
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@@ -5266,6 +5654,7 @@ RectTransform:
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Assets/Scripts/UI/PageController.cs

@@ -1,10 +1,6 @@
 using UnityEngine;
 using UnityEngine.UI;
 
-/// <summary>
-/// 管理首页 -> 模式选择页 -> 固定方式选择页 -> 实验界面 的切换。
-/// 挂在 Canvas 上，与 UIManager 协同工作。
-/// </summary>
 public class PageController : MonoBehaviour
 {
     [Header("=== 三个主页面 ===")]
@@ -12,6 +8,10 @@ public class PageController : MonoBehaviour
     [SerializeField] private GameObject _modeSelectPanel;
     [SerializeField] private GameObject _fixationPanel;
 
+    [Header("=== 实验页面 ===")]
+    [SerializeField] private GameObject _experimentPanel;
+    [SerializeField] private Button _btnExperimentBack;
+
     [Header("=== 实验内 UI（由 UIManager 管理）===")]
     [SerializeField] private UIManager _uiManager;
 
@@ -32,14 +32,13 @@ public class PageController : MonoBehaviour
 
     [Header("=== 模式说明文案 ===")]
     [SerializeField] [TextArea(2, 4)] private string _practiceModeDesc =
-        "● 模拟练习模式：不限时长，可反复练习。系统不评分，帮助您熟悉实验流程和操作步骤。";
+        "模拟练习模式：不限时长，可反复练习。系统不评分，帮助您熟悉实验流程和操作步骤。";
     [SerializeField] [TextArea(2, 4)] private string _examModeDesc =
-        "● 考核评估模式：限定时间，完成后系统自动评分，并提供详细反馈报告。";
+        "考核评估模式：限定时间，完成后系统自动评分，并提供详细反馈报告。";
 
     [Header("=== 编辑器预览（仅 Editor 模式有效）===")]
     [SerializeField] private EditorPreviewPage _editorPreview = EditorPreviewPage.None;
 
-    // Page 枚举改为 public，Inspector 中可通过 _editorPreview 切换
     public enum Page { Home, ModeSelect, Fixation, Experiment }
     public enum EditorPreviewPage { None, Home, ModeSelect, Fixation, Experiment }
 
@@ -62,6 +61,9 @@ public class PageController : MonoBehaviour
         if (_btnLimbFixation != null) _btnLimbFixation.onClick.AddListener(() => OnFixationSelected(FixationMethod.LimbFixation));
         if (_btnSplintFixation != null) _btnSplintFixation.onClick.AddListener(() => OnFixationSelected(FixationMethod.SplintFixation));
 
+        // 绑定实验页面按钮
+        if (_btnExperimentBack != null) _btnExperimentBack.onClick.AddListener(OnExperimentBackClicked);
+
         // 初始化模式说明文字
         if (_modeDescText != null)
         {
@@ -73,15 +75,10 @@ public class PageController : MonoBehaviour
     }
 
 #if UNITY_EDITOR
-    /// <summary>
-    /// 在 Inspector 中修改 _editorPreview 下拉框时，立即切换 Scene View 中显示的页面，
-    /// 方便编辑不同页面的 UI 布局。仅在非运行状态下生效。
-    /// </summary>
     private void OnValidate()
     {
         if (Application.isPlaying) return;
 
-        // 延迟一帧执行，避免在序列化过程中修改场景导致警告
         UnityEditor.EditorApplication.delayCall += () =>
         {
             if (this == null) return;
@@ -90,7 +87,6 @@ public class PageController : MonoBehaviour
             switch (_editorPreview)
             {
                 case EditorPreviewPage.None:
-                    // 不做任何切换，保留当前状态
                     break;
                 case EditorPreviewPage.Home:
                     ShowPageEditMode(Page.Home);
@@ -106,7 +102,6 @@ public class PageController : MonoBehaviour
                     break;
             }
 
-            // 切换完成后重置为 None，避免与后续操作冲突
             _editorPreview = EditorPreviewPage.None;
         };
     }
@@ -116,6 +111,7 @@ public class PageController : MonoBehaviour
         if (_homePagePanel != null) _homePagePanel.SetActive(page == Page.Home);
         if (_modeSelectPanel != null) _modeSelectPanel.SetActive(page == Page.ModeSelect);
         if (_fixationPanel != null) _fixationPanel.SetActive(page == Page.Fixation);
+        if (_experimentPanel != null) _experimentPanel.SetActive(page == Page.Experiment);
 
         if (_uiManager != null)
             _uiManager.enabled = (page == Page.Experiment);
@@ -126,14 +122,14 @@ public class PageController : MonoBehaviour
 
     #region 页面切换
 
-        private void ShowPage(Page page)
+    private void ShowPage(Page page)
     {
         _currentPage = page;
 
         if (_homePagePanel != null) _homePagePanel.SetActive(page == Page.Home);
         if (_modeSelectPanel != null) _modeSelectPanel.SetActive(page == Page.ModeSelect);
         if (_fixationPanel != null) _fixationPanel.SetActive(page == Page.Fixation);
-        if (_btnFixationBack != null) _btnFixationBack.gameObject.SetActive(page == Page.Fixation);
+        if (_experimentPanel != null) _experimentPanel.SetActive(page == Page.Experiment);
 
         if (_uiManager != null)
             _uiManager.enabled = (page == Page.Experiment);
@@ -168,8 +164,8 @@ public class PageController : MonoBehaviour
         if (_modeDescText != null)
         {
             _modeDescText.text = mode == ExperimentMode.Learn
-                ? _practiceModeDesc + "\n\n✓ 当前已选择「模拟练习模式」"
+                ? _practiceModeDesc + "\n\n 当前已选择「模拟练习模式」"
-                : _examModeDesc + "\n\n✓ 当前已选择「考核评估模式」";
+                : _examModeDesc + "\n\n 当前已选择「考核评估模式」";
         }
 
         ShowPage(Page.Fixation);
@@ -185,6 +181,11 @@ public class PageController : MonoBehaviour
         ShowPage(Page.ModeSelect);
     }
 
+    private void OnExperimentBackClicked()
+    {
+        ShowPage(Page.Fixation);
+    }
+
     private void OnFixationSelected(FixationMethod method)
     {
         var gm = GameManager.Instance;
@@ -211,6 +212,5 @@ public class PageController : MonoBehaviour
         ShowPage(Page.Home);
     }
 
-
     #endregion
 }