解析blob响应是否登录失效

 import { saveAs } from 'file-saver'
 import { saveAs } from 'file-saver'
 import axios from 'axios'
 import axios from 'axios'
 import { getToken } from '@/utils/auth'
 import { getToken } from '@/utils/auth'
+import { Message } from 'element-ui'
 
 
 const baseURL = process.env.VUE_APP_BASE_API
 const baseURL = process.env.VUE_APP_BASE_API
 
 
@@ -12,9 +13,14 @@ export default {
       url: url,
       url: url,
       responseType: 'blob',
       responseType: 'blob',
       headers: { 'Authorization': 'Bearer ' + getToken() }
       headers: { 'Authorization': 'Bearer ' + getToken() }
-    }).then(res => {
+    }).then(async (res) => {
+      const isLogin = await this.blobValidate(res.data);
+      if (isLogin) {
         const blob = new Blob([res.data])
         const blob = new Blob([res.data])
         this.saveAs(blob, decodeURI(res.headers['download-filename']))
         this.saveAs(blob, decodeURI(res.headers['download-filename']))
+      } else {
+        Message.error('无效的会话，或者会话已过期，请重新登录。');
+      }
     })
     })
   },
   },
   resource(resource) {
   resource(resource) {
@@ -24,9 +30,14 @@ export default {
       url: url,
       url: url,
       responseType: 'blob',
       responseType: 'blob',
       headers: { 'Authorization': 'Bearer ' + getToken() }
       headers: { 'Authorization': 'Bearer ' + getToken() }
-    }).then(res => {
+    }).then(async (res) => {
+      const isLogin = await this.blobValidate(res.data);
+      if (isLogin) {
         const blob = new Blob([res.data])
         const blob = new Blob([res.data])
         this.saveAs(blob, decodeURI(res.headers['download-filename']))
         this.saveAs(blob, decodeURI(res.headers['download-filename']))
+      } else {
+        Message.error('无效的会话，或者会话已过期，请重新登录。');
+      }
     })
     })
   },
   },
   zip(url, name) {
   zip(url, name) {
@@ -36,13 +47,27 @@ export default {
       url: url,
       url: url,
       responseType: 'blob',
       responseType: 'blob',
       headers: { 'Authorization': 'Bearer ' + getToken() }
       headers: { 'Authorization': 'Bearer ' + getToken() }
-    }).then(res => {
+    }).then(async (res) => {
+      const isLogin = await this.blobValidate(res.data);
+      if (isLogin) {
         const blob = new Blob([res.data], { type: 'application/zip' })
         const blob = new Blob([res.data], { type: 'application/zip' })
         this.saveAs(blob, name)
         this.saveAs(blob, name)
+      } else {
+        Message.error('无效的会话，或者会话已过期，请重新登录。');
+      }
     })
     })
   },
   },
   saveAs(text, name, opts) {
   saveAs(text, name, opts) {
     saveAs(text, name, opts);
     saveAs(text, name, opts);
+  },
+  async blobValidate(data) {
+    try {
+      const text = await data.text();
+      JSON.parse(text);
+      return false;
+    } catch (error) {
+      return true;
     }
     }
+  },
 }
 }