diff --git a/APP Store.zip b/APP Store.zip
deleted file mode 100644
index aec3a8d..0000000
Binary files a/APP Store.zip and /dev/null differ
diff --git a/admin/manage_versions.php b/admin/manage_versions.php
index d8887f4..a4e91a6 100644
--- a/admin/manage_versions.php
+++ b/admin/manage_versions.php
@@ -81,39 +81,80 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['add_version'])) {
     }
 }
 
-// 处理删除版本
-if (isset($_GET['delete_id']) && is_numeric($_GET['delete_id'])) {
-    $versionId = $_GET['delete_id'];
+// 处理版本删除请求
+if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['delete_version'])) {
+    // 设置内容类型为纯文本
+    header('Content-Type: text/plain');
     
-    // 获取版本信息
-    $getVersionSql = "SELECT file_path FROM app_versions WHERE id = ? AND app_id = ?";
-    $stmt = $conn->prepare($getVersionSql);
-    $stmt->bind_param("ii", $versionId, $appId);
-    $stmt->execute();
-    $result = $stmt->get_result();
+    $versionId = $_POST['version_id'];
+    $appId = $_POST['app_id'];
     
-    if ($result->num_rows === 1) {
-        $version = $result->fetch_assoc();
+    // 初始化消息变量
+    $message = '';
+    
+    // 开始事务
+    $conn->begin_transaction();
+    
+    try {
+        // 1. 获取文件路径
+        $filePath = '';
+        $getFilePathSql = "SELECT file_path FROM app_versions WHERE id = ? AND app_id = ?";
+        $getFileStmt = $conn->prepare($getFilePathSql);
         
-        // 删除文件
-        if (file_exists($version['file_path'])) {
-            unlink($version['file_path']);
+        if (!$getFileStmt) {
+            throw new Exception("获取文件路径查询准备失败: " . $conn->error);
         }
         
-        // 删除数据库记录
+        $getFileStmt->bind_param("ii", $versionId, $appId);
+        $getFileStmt->execute();
+        $fileResult = $getFileStmt->get_result();
+        
+        if ($fileResult->num_rows > 0) {
+            $fileRow = $fileResult->fetch_assoc();
+            $filePath = $fileRow['file_path'];
+        }
+        
+        // 2. 从数据库删除版本记录
         $deleteVersionSql = "DELETE FROM app_versions WHERE id = ? AND app_id = ?";
-        $stmt = $conn->prepare($deleteVersionSql);
-        $stmt->bind_param("ii", $versionId, $appId);
+        $deleteVersionStmt = $conn->prepare($deleteVersionSql);
         
-        if ($stmt->execute() === TRUE) {
-            header('Location: manage_versions.php?app_id=' . $appId . '&success=版本删除成功');
-            exit;
-        } else {
-            $error = '版本删除失败: ' . $conn->error;
+        if (!$deleteVersionStmt) {
+            throw new Exception("版本删除查询准备失败: " . $conn->error);
         }
-    } else {
-        $error = '版本不存在';
+        
+        $deleteVersionStmt->bind_param("ii", $versionId, $appId);
+        
+        if (!$deleteVersionStmt->execute()) {
+            throw new Exception("版本删除执行失败: " . $conn->error);
+        }
+        
+        // 检查是否有记录被删除
+        if ($deleteVersionStmt->affected_rows === 0) {
+            throw new Exception("未找到要删除的版本记录");
+        }
+        
+        // 3. 如果数据库删除成功，尝试删除文件（即使文件删除失败也不回滚数据库操作）
+        if (!empty($filePath) && file_exists($filePath)) {
+            if (!unlink($filePath)) {
+                // 文件删除失败不影响数据库操作，继续处理
+            }
+        }
+        
+        // 提交事务
+        $conn->commit();
+        $message = '版本删除成功';
+        
+    } catch (Exception $e) {
+        // 回滚事务
+        $conn->rollback();
+        $message = '版本删除失败: ' . $e->getMessage();
     }
+
+    // 只输出消息，不包含任何HTML
+    echo $message;
+    
+    // 确保脚本终止，不执行后续代码
+    exit;
 }
 
 // 处理编辑版本
diff --git a/developer/version_control.php b/developer/version_control.php
index ace71dd..9621585 100644
--- a/developer/version_control.php
+++ b/developer/version_control.php
@@ -292,6 +292,8 @@ if (!$verStmt) {
     <link rel="stylesheet" href="/css/all.min.css">
     <link rel="stylesheet" href="../styles.css">
     <script src="/js/sweetalert.js"></script>
+    <!-- Marked.js库用于Markdown解析 -->
+    <script src="https://cdn.jsdelivr.net/npm/marked/marked.min.js"></script>
     <style>
         .blur-bg {
             backdrop-filter: blur(10px);
@@ -358,10 +360,19 @@ if (!$verStmt) {
                             </div>
                         </div>
                     </div>
-                    <div class="form-floating mb-3">
-                        <textarea class="form-control" id="changelog" name="changelog" rows="3" placeholder="更新日志"></textarea>
-                        <label for="changelog">更新日志（支持Markdown）</label>
-                    </div>
+                    <div class="mb-3">
+                            <div class="mb-1">
+                                <label for="changelog" class="form-label">更新日志（支持Markdown）</label>
+                                <div class="btn-group float-end">
+                                    <button type="button" id="writeModeBtn" class="btn btn-sm btn-primary active">编辑</button>
+                                    <button type="button" id="previewModeBtn" class="btn btn-sm btn-secondary">预览</button>
+                                </div>
+                            </div>
+                            <div id="writeModeDiv">
+                                <textarea class="form-control" id="changelog" name="changelog" rows="6" placeholder="更新日志（支持Markdown语法）"></textarea>
+                            </div>
+                            <div id="previewModeDiv" class="p-3 border rounded bg-light" style="min-height: 200px; display: none;"></div>
+                        </div>
                     <button type="submit" class="btn btn-primary" name="upload_version"><i class="fas fa-cloud-upload-alt me-1"></i>上传新版本</button>
                     <a href="dashboard.php" class="btn btn-secondary ms-2"><i class="fas fa-arrow-left me-1"></i>返回</a>
                 </form>
@@ -387,8 +398,11 @@ if (!$verStmt) {
                                 <tr>
                                     <td><?php echo htmlspecialchars($ver['version']); ?></td>
                                     <td><?php echo htmlspecialchars($ver['upload_time']); ?></td>
-                                    <td><?php echo nl2br(htmlspecialchars($ver['changelog'] ?: '无')); ?></td>
                                     <td>
+                                        <div class="changelog-content" data-markdown="<?php echo htmlspecialchars($ver['changelog'] ?: '无'); ?>">
+                                            <?php echo nl2br(htmlspecialchars($ver['changelog'] ?: '无')); ?>
+                                        </div>
+                                    </td>
                                         <a href="../download.php?id=<?php echo $ver['id']; ?>&type=version" class="btn btn-sm btn-outline-primary"><i class="fas fa-download me-1"></i>下载</a>
                                         <a href="#" class="btn btn-sm btn-outline-warning ms-2" onclick="openEditModal(<?php echo $ver['id']; ?>, '<?php echo htmlspecialchars($ver['version']); ?>', '<?php echo htmlspecialchars($ver['changelog']); ?>')"><i class="fas fa-edit me-1"></i>修改</a>
                                         <a href="#" class="btn btn-sm btn-outline-danger ms-2" onclick="confirmDelete(<?php echo $ver['id']; ?>)"><i class="fas fa-trash-alt me-1"></i>删除</a>
@@ -408,6 +422,50 @@ if (!$verStmt) {
 
     <script src="../js/bootstrap.bundle.js"></script>
     <script>
+        // Markdown预览功能实现
+        function initMarkdownPreview() {
+            // 上传表单的Markdown预览
+            const writeModeBtn = document.getElementById('writeModeBtn');
+            const previewModeBtn = document.getElementById('previewModeBtn');
+            const writeModeDiv = document.getElementById('writeModeDiv');
+            const previewModeDiv = document.getElementById('previewModeDiv');
+            const changelogTextarea = document.getElementById('changelog');
+
+            writeModeBtn.addEventListener('click', function() {
+                writeModeBtn.classList.add('active');
+                writeModeBtn.classList.remove('btn-secondary');
+                writeModeBtn.classList.add('btn-primary');
+                previewModeBtn.classList.remove('active');
+                previewModeBtn.classList.remove('btn-primary');
+                previewModeBtn.classList.add('btn-secondary');
+                writeModeDiv.style.display = 'block';
+                previewModeDiv.style.display = 'none';
+            });
+
+            previewModeBtn.addEventListener('click', function() {
+                previewModeBtn.classList.add('active');
+                previewModeBtn.classList.remove('btn-secondary');
+                previewModeBtn.classList.add('btn-primary');
+                writeModeBtn.classList.remove('active');
+                writeModeBtn.classList.remove('btn-primary');
+                writeModeBtn.classList.add('btn-secondary');
+                writeModeDiv.style.display = 'none';
+                previewModeDiv.style.display = 'block';
+                
+                // 解析Markdown并显示预览
+                if (changelogTextarea && marked) {
+                    previewModeDiv.innerHTML = marked.parse(changelogTextarea.value || '无更新日志');
+                }
+            });
+
+            // 实时更新预览
+            changelogTextarea.addEventListener('input', function() {
+                if (previewModeDiv.style.display !== 'none' && marked) {
+                    previewModeDiv.innerHTML = marked.parse(changelogTextarea.value || '无更新日志');
+                }
+            });
+        }
+
         function openEditModal(versionId, version, changelog) {
             const modal = `
                 <div class="modal fade" id="editVersionModal" tabindex="-1" aria-labelledby="editVersionModalLabel" aria-hidden="true">
@@ -424,9 +482,18 @@ if (!$verStmt) {
                                         <input type="text" class="form-control" id="editVersion" name="version" value="${version}" required>
                                         <label for="editVersion">版本号</label>
                                     </div>
-                                    <div class="form-floating mb-3">
-                                        <textarea class="form-control" id="editChangelog" name="changelog" rows="3">${changelog}</textarea>
-                                        <label for="editChangelog">更新日志</label>
+                                    <div class="mb-3">
+                                        <div class="mb-1">
+                                            <label for="editChangelog" class="form-label">更新日志</label>
+                                            <div class="btn-group float-end">
+                                                <button type="button" id="editWriteModeBtn" class="btn btn-sm btn-primary active">编辑</button>
+                                                <button type="button" id="editPreviewModeBtn" class="btn btn-sm btn-secondary">预览</button>
+                                            </div>
+                                        </div>
+                                        <div id="editWriteModeDiv">
+                                            <textarea class="form-control" id="editChangelog" name="changelog" rows="6">${changelog}</textarea>
+                                        </div>
+                                        <div id="editPreviewModeDiv" class="p-3 border rounded bg-light" style="min-height: 200px; display: none;"></div>
                                     </div>
                                     <div class="mb-3">
                                         <label for="new_app_file" class="form-label">更新App文件 (可选)</label>
@@ -464,6 +531,52 @@ if (!$verStmt) {
                     window.location.reload();
                 });
             });
+
+            // 编辑模态框的Markdown预览功能
+            const editWriteModeBtn = document.getElementById('editWriteModeBtn');
+            const editPreviewModeBtn = document.getElementById('editPreviewModeBtn');
+            const editWriteModeDiv = document.getElementById('editWriteModeDiv');
+            const editPreviewModeDiv = document.getElementById('editPreviewModeDiv');
+            const editChangelogTextarea = document.getElementById('editChangelog');
+
+            editWriteModeBtn.addEventListener('click', function() {
+                editWriteModeBtn.classList.add('active');
+                editWriteModeBtn.classList.remove('btn-secondary');
+                editWriteModeBtn.classList.add('btn-primary');
+                editPreviewModeBtn.classList.remove('active');
+                editPreviewModeBtn.classList.remove('btn-primary');
+                editPreviewModeBtn.classList.add('btn-secondary');
+                editWriteModeDiv.style.display = 'block';
+                editPreviewModeDiv.style.display = 'none';
+            });
+
+            editPreviewModeBtn.addEventListener('click', function() {
+                editPreviewModeBtn.classList.add('active');
+                editPreviewModeBtn.classList.remove('btn-secondary');
+                editPreviewModeBtn.classList.add('btn-primary');
+                editWriteModeBtn.classList.remove('active');
+                editWriteModeBtn.classList.remove('btn-primary');
+                editWriteModeBtn.classList.add('btn-secondary');
+                editWriteModeDiv.style.display = 'none';
+                editPreviewModeDiv.style.display = 'block';
+                
+                // 解析Markdown并显示预览
+                if (editChangelogTextarea && marked) {
+                    editPreviewModeDiv.innerHTML = marked.parse(editChangelogTextarea.value || '无更新日志');
+                }
+            });
+
+            // 实时更新预览
+            editChangelogTextarea.addEventListener('input', function() {
+                if (editPreviewModeDiv.style.display !== 'none' && marked) {
+                    editPreviewModeDiv.innerHTML = marked.parse(editChangelogTextarea.value || '无更新日志');
+                }
+            });
+
+            // 模态框关闭时移除元素
+            document.getElementById('editVersionModal').addEventListener('hidden.bs.modal', function() {
+                this.remove();
+            });
         }
 
         function confirmDelete(versionId) {
@@ -527,6 +640,49 @@ if (!$verStmt) {
                 }
             });
         }
+        // 页面加载完成后初始化Markdown预览功能
+        document.addEventListener('DOMContentLoaded', function() {
+            initMarkdownPreview();
+            
+            // 为版本历史中的更新日志添加Markdown渲染
+            renderChangelogHistory();
+        });
+        
+        // 渲染版本历史中的更新日志
+        function renderChangelogHistory() {
+            const changelogElements = document.querySelectorAll('.changelog-content');
+            
+            changelogElements.forEach(element => {
+                const markdownText = element.getAttribute('data-markdown');
+                if (markdownText && marked) {
+                    try {
+                        // 创建一个切换按钮
+                        const toggleBtn = document.createElement('button');
+                        toggleBtn.className = 'btn btn-xs btn-outline-secondary mb-1';
+                        toggleBtn.textContent = '查看格式化';
+                        
+                        let isFormatted = false;
+                        const originalContent = element.innerHTML;
+                        
+                        toggleBtn.addEventListener('click', function() {
+                            if (isFormatted) {
+                                element.innerHTML = originalContent;
+                                toggleBtn.textContent = '查看格式化';
+                            } else {
+                                element.innerHTML = marked.parse(markdownText);
+                                toggleBtn.textContent = '查看原始';
+                            }
+                            isFormatted = !isFormatted;
+                        });
+                        
+                        // 将按钮添加到元素前
+                        element.parentNode.insertBefore(toggleBtn, element);
+                    } catch (error) {
+                        console.error('Markdown解析错误:', error);
+                    }
+                }
+            });
+        }
     </script>
 </body>
 </html>
\ No newline at end of file