feat(StudyDetailPage): 添加文件下载功能

为StudyDetailPage页面添加文件下载功能，用户点击非PDF文件时触发下载操作。通过axios获取文件数据，并使用Blob对象处理下载流程，提升用户体验。

@@ -54,8 +54,12 @@
                                     <font-awesome-icon icon="file-alt" class="text-gray-400 text-lg flex-shrink-0" />
                                     <h3 class="text-x font-medium text-gray-900 truncate">{{ item.title }}</h3>
                                 </div>
-                                <div v-if="item.url.toLowerCase().endsWith('.pdf')" class="text-x text-blue-600 hover:text-blue-800 hover:underline whitespace-nowrap" @click="showPdf(item)">查看文件</div>
-                                <a v-else :href="item.url" target="_blank" class="text-x text-blue-600 hover:text-blue-800 hover:underline whitespace-nowrap">查看文件</a>
+                                <div v-if="item.url.toLowerCase().endsWith('.pdf')"
+                                    class="text-x text-blue-600 hover:text-blue-800 hover:underline whitespace-nowrap"
+                                    @click="showPdf(item)">查看文件</div>
+                                <div v-else @click="downloadFile(item)"
+                                    class="text-x text-blue-600 hover:text-blue-800 hover:underline whitespace-nowrap">
+                                    下载文件</div>
                             </div>
                         </div>
                     </div>
@@ -135,7 +139,7 @@
                                                     <span class="font-medium text-gray-900">{{ comment.name }}</span>
                                                     <div class="flex items-center space-x-1">
                                                         <span class="text-sm text-gray-500">{{ comment.like_count
-                                                            }}</span>
+                                                        }}</span>
                                                         &nbsp;
                                                         <van-icon :name="comment.is_like ? 'like' : 'like-o'"
                                                             :class="{ 'text-red-500': comment.is_like, 'text-gray-400': !comment.is_like }"
@@ -145,7 +149,7 @@
                                                 </div>
                                                 <p class="text-gray-700 text-sm mb-1">{{ comment.note }}</p>
                                                 <div class="text-gray-400 text-xs">{{ formatDate(comment.updated_time)
-                                                    }}</div>
+                                                }}</div>
                                             </div>
                                         </div>
                                     </div>
@@ -238,6 +242,7 @@ import VideoPlayer from '@/components/ui/VideoPlayer.vue';
 import AudioPlayer from '@/components/ui/AudioPlayer.vue';
 import dayjs from 'dayjs';
 import { formatDate } from '@/utils/tools'
+import axios from 'axios';
 
 import PdfPreview from '@/components/ui/PdfPreview.vue';
 
@@ -360,7 +365,7 @@ const pdfShow = ref(false);
 const pdfTitle = ref('');
 const pdfUrl = ref('');
 
-const showPdf = ({title, url}) => {
+const showPdf = ({ title, url }) => {
     pdfTitle.value = title;
     pdfUrl.value = url;
     pdfShow.value = true;
@@ -584,6 +589,59 @@ watch(showCommentPopup, async (newVal) => {
         onPopupLoad();
     }
 });
+
+// 下载文件
+const downloadFile = ({ title, url }) => {
+    // 获取文件URL和文件名
+    const fileUrl = url;
+    const fileName = title;
+
+    // 根据文件URL后缀获取MIME类型
+    const getMimeType = (url) => {
+        const extension = url.split('.').pop().toLowerCase();
+        const mimeTypes = {
+            'pdf': 'application/pdf',
+            'doc': 'application/msword',
+            'docx': 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+            'xls': 'application/vnd.ms-excel',
+            'xlsx': 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
+            'ppt': 'application/vnd.ms-powerpoint',
+            'pptx': 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
+            'txt': 'text/plain',
+            'zip': 'application/zip',
+            'rar': 'application/x-rar-compressed',
+            '7z': 'application/x-7z-compressed',
+            'mp3': 'audio/mpeg',
+            'mp4': 'video/mp4',
+            'jpg': 'image/jpeg',
+            'jpeg': 'image/jpeg',
+            'png': 'image/png',
+            'gif': 'image/gif'
+        };
+        return mimeTypes[extension] || 'application/octet-stream';
+    };
+
+    axios({
+        method: 'get',
+        url: fileUrl,
+        responseType: 'blob' // 表示返回的数据类型是Blob
+    }).then((response) => {
+        const blob = new Blob([response.data], { type: getMimeType(fileUrl) });
+        const url = window.URL.createObjectURL(blob);
+
+        const a = document.createElement('a');
+        a.href = url;
+        a.download = fileName;
+        a.style.display = 'none';
+        document.body.appendChild(a);
+        a.click();
+        document.body.removeChild(a);
+
+        window.URL.revokeObjectURL(url);
+    }).catch((error) => {
+        console.error('下载文件出错：', error);
+    });
+}
 </script>
 
 <style lang="less" scoped>