fix：解决点击pdf再点击docx预览会下载的bug

src/components/FilePreviewModal/index.tsx

@@ -16,11 +16,14 @@ export const FilePreviewModal: React.FC<FilePreviewModalProps> = ({ isOpen, onCl
   const [loading, setLoading] = useState(false)
   const [fileType, setFileType] = useState<string>('')
 
-  // 确定文件类型
+  // 确定文件类型 - 改进版本
   useEffect(() => {
+    // 重置状态
+    setFileType('')
+
     if (doc?.documentAlias) {
-      const name = doc.documentAlias.toLowerCase()
-      // 添加更严格的文件类型判断
+      const name = doc.documentAlias.toLowerCase().trim()
+
       if (name.endsWith('.pdf')) {
         setFileType('pdf')
       }
@@ -30,14 +33,24 @@ export const FilePreviewModal: React.FC<FilePreviewModalProps> = ({ isOpen, onCl
  else if (name.endsWith('.doc')) {
         setFileType('doc')
       }
- else if (name.endsWith('.xlsx') || name.endsWith('.xls')) {
+ else if (name.endsWith('.xlsx')) {
         setFileType('xlsx')
       }
+ else if (name.endsWith('.xls')) {
+        setFileType('xls')
+      }
  else {
         setFileType('')
       }
     }
-  }, [doc])
+  }, [doc, isOpen]) // 添加 isOpen 依赖确保每次打开时重新判断
+
+  // 当文件类型或URL变化时重置loading状态
+  useEffect(() => {
+    if (fileType && docUrl) {
+      setLoading(true)
+    }
+  }, [fileType, docUrl])
 
   const handleDownload = () => {
     if (docUrl) {
@@ -74,6 +87,7 @@ export const FilePreviewModal: React.FC<FilePreviewModalProps> = ({ isOpen, onCl
         return (
           <div className="h-[70vh] max-h-[70vh] overflow-auto">
             <DocxPreview
+              key={docUrl} // 添加key确保组件重新挂载
               src={docUrl}
               className="w-full min-h-full"
               onRendered={handleDocumentRendered}
@@ -103,6 +117,7 @@ export const FilePreviewModal: React.FC<FilePreviewModalProps> = ({ isOpen, onCl
         return (
           <div className="h-[70vh] max-h-[70vh] overflow-auto">
             <ExcelPreview
+              key={docUrl} // 添加key确保组件重新挂载
               src={docUrl}
               options={{ xls: true }}
               className="w-full min-h-full"
@@ -116,6 +131,7 @@ export const FilePreviewModal: React.FC<FilePreviewModalProps> = ({ isOpen, onCl
         return (
           <div className="h-[70vh] max-h-[70vh] overflow-auto">
             <ExcelPreview
+              key={docUrl} // 添加key确保组件重新挂载
               src={docUrl}
               className="w-full min-h-full"
               onRendered={handleDocumentRendered}
@@ -128,6 +144,7 @@ export const FilePreviewModal: React.FC<FilePreviewModalProps> = ({ isOpen, onCl
         return (
           <div className="h-[70vh] max-h-[70vh] overflow-auto">
             <PdfPreview
+              key={docUrl} // 添加key确保组件重新挂载
               src={docUrl}
               className="w-full min-h-full"
               onLoaded={handleDocumentRendered}
@@ -150,10 +167,17 @@ export const FilePreviewModal: React.FC<FilePreviewModalProps> = ({ isOpen, onCl
     }
   }
 
+  // 模态框关闭时重置状态
+  const handleClose = () => {
+    setLoading(false)
+    setFileType('')
+    onClose()
+  }
+
   return (
     <Modal
       isOpen={isOpen}
-      onClose={onClose}
+      onClose={handleClose} // 使用改进的关闭函数
       size="3xl"
       classNames={{
         base: 'max-h-[90vh] max-w-[50vw]',