fix: 导出日志兼容无权限的处理，对文件流判断是否包含报错信息，进行提示

src/utils/download.ts

@@ -1,10 +1,24 @@
 import download from 'downloadjs';
+import { ElMessage } from 'element-plus';
 
 const downloadFile = (res: any, fileName: string = '导出日志.xlsx') => {
-  // 用split是避免多次取值重复都好分割的情况，比如 
-  // attachment; filename="2022-12-06 21:34:35-SysLoginLog.xlsx", attachment; filename="2022-12-06 21:34:35-SysLoginLog.xlsx"
-  const lastFileName = res.headers['content-disposition'] ? res.headers['content-disposition'].split(',')[0].replaceAll('attachment; filename="', '').replaceAll('"', '') : fileName;
-  download(res.data, lastFileName, res.headers['content-type']);
+
+  // 判断是不是返回的是json，是json说明报错了，否则返回的是文本流
+  const decoder = new TextDecoder('utf-8');
+  const text = decoder.decode(res.data);
+
+  try {
+    const errJson = JSON.parse(text)
+    if (errJson.message) {
+      ElMessage.closeAll()
+      ElMessage.error(errJson.message)
+    }
+  } catch {
+    // 用split是避免多次取值重复都好分割的情况，比如 
+    // attachment; filename="2022-12-06 21:34:35-SysLoginLog.xlsx", attachment; filename="2022-12-06 21:34:35-SysLoginLog.xlsx"
+    const lastFileName = res.headers['content-disposition'] ? res.headers['content-disposition'].split(',')[0].replaceAll('attachment; filename="', '').replaceAll('"', '') : fileName;
+    download(res.data, lastFileName, res.headers['content-type']);
+  }
 }
 
 export default downloadFile