fix '-' Unknown

Signed-off-by: zhangtianli2006 <49156174+zhangtianli2006@users.noreply.github.com>

Author: ZTL-UwU

src/components/problem/content.vue

@@ -87,8 +87,8 @@ export default {
       isWider: false,
       enable: true,
       hidden: false,
-      time: 'Unknown',
-      memery: 'Unknown',
+      time: '-',
+      memery: '-',
       timeAdd: 'Unknown',
       problemLoading: true
     };

src/components/user/content.vue

@@ -82,16 +82,16 @@ export default {
   name: 'UserHomepage',
   data() {
     return {
-      username: '-',
+      username: 'Unknown',
       userid: '-',
-      email: '-',
+      email: 'Unknown',
       introduction: null,
       solved: '-',
       submit: '-',
       rate: 100,
       ismine: false,
-      timeJoin: null,
-      lastLogin: null,
+      timeJoin: 'Unknown',
+      lastLogin: 'Unknown',
       userLoading: true
     };
   },