diff --git a/GZCTF/ClientApp/src/components/MarkdownRender.tsx b/GZCTF/ClientApp/src/components/MarkdownRender.tsx
index ce3a1a7d4..3217dfce7 100644
--- a/GZCTF/ClientApp/src/components/MarkdownRender.tsx
+++ b/GZCTF/ClientApp/src/components/MarkdownRender.tsx
@@ -50,6 +50,7 @@ export const MarkdownRender = forwardRef<HTMLDivElement, MarkdownProps>((props,
       }
     },
     renderer,
+    silent: true,
   })
 
   return (
diff --git a/GZCTF/ClientApp/src/components/PostCard.tsx b/GZCTF/ClientApp/src/components/PostCard.tsx
index 6f3e6f898..ffb9040a3 100644
--- a/GZCTF/ClientApp/src/components/PostCard.tsx
+++ b/GZCTF/ClientApp/src/components/PostCard.tsx
@@ -39,7 +39,7 @@ const PostCard: FC<PostCardProps> = ({ post, onTogglePinned }) => {
           <Group position="apart" style={{ margin: 'auto', fontStyle: 'normal' }}>
             <Group spacing={5} position="right">
               <Avatar src={post.autherAvatar} size="sm">
-                {post.autherName?.at(0) ?? 'A'}
+                {post.autherName?.slice(0, 1) ?? 'A'}
               </Avatar>
               <Text weight={700}>
                 {post.autherName ?? 'Anonym'} 发布于 {dayjs(post.time).format('HH:mm, YY/MM/DD')}
diff --git a/GZCTF/ClientApp/src/components/ScoreboardTable.tsx b/GZCTF/ClientApp/src/components/ScoreboardTable.tsx
index 24e76beab..a7f6fba1e 100644
--- a/GZCTF/ClientApp/src/components/ScoreboardTable.tsx
+++ b/GZCTF/ClientApp/src/components/ScoreboardTable.tsx
@@ -168,7 +168,7 @@ const TableRow: FC<{
               }),
             })}
           >
-            {item.name?.at(0) ?? 'T'}
+            {item.name?.slice(0, 1) ?? 'T'}
           </Avatar>
           <Text
             lineClamp={1}
@@ -340,7 +340,7 @@ const ScoreboardTable: FC = () => {
         title={
           <Group position="left" spacing={5} noWrap>
             <Avatar src={currentItem?.avatar} size="md" radius="md" color="brand">
-              {currentItem?.name?.at(0) ?? 'T'}
+              {currentItem?.name?.slice(0, 1) ?? 'T'}
             </Avatar>
             <Title align="left" order={4}>
               {currentItem?.name}
diff --git a/GZCTF/ClientApp/src/components/TeamCard.tsx b/GZCTF/ClientApp/src/components/TeamCard.tsx
index 63a30672e..1bbd7d713 100644
--- a/GZCTF/ClientApp/src/components/TeamCard.tsx
+++ b/GZCTF/ClientApp/src/components/TeamCard.tsx
@@ -48,7 +48,7 @@ const TeamCard: FC<TeamCardProps> = (props) => {
         <Stack style={{ flexGrow: 1 }}>
           <Group align="stretch" position="apart">
             <Avatar color="cyan" size="lg" radius="md" src={team.avatar}>
-              {team.name?.at(0) ?? 'T'}
+              {team.name?.slice(0, 1) ?? 'T'}
             </Avatar>
 
             <Stack spacing={0} style={{ width: 'calc(100% - 72px)' }}>
diff --git a/GZCTF/ClientApp/src/components/TeamRank.tsx b/GZCTF/ClientApp/src/components/TeamRank.tsx
index 6f573c835..43fe372ad 100644
--- a/GZCTF/ClientApp/src/components/TeamRank.tsx
+++ b/GZCTF/ClientApp/src/components/TeamRank.tsx
@@ -55,7 +55,7 @@ const TeamRank: FC<PaperProps> = (props) => {
       <Stack spacing={8}>
         <Group>
           <Avatar color="cyan" size="md" radius="md" src={data?.rank?.avatar}>
-            {data?.rank?.name?.at(0) ?? 'T'}
+            {data?.rank?.name?.slice(0, 1) ?? 'T'}
           </Avatar>
           <Skeleton width="8rem" visible={!data}>
             <Title order={4}>{data?.rank?.name ?? 'Team'}</Title>
diff --git a/GZCTF/ClientApp/src/pages/admin/Teams.tsx b/GZCTF/ClientApp/src/pages/admin/Teams.tsx
index b4edaf8dd..48bb5cee2 100644
--- a/GZCTF/ClientApp/src/pages/admin/Teams.tsx
+++ b/GZCTF/ClientApp/src/pages/admin/Teams.tsx
@@ -155,7 +155,7 @@ const Teams: FC = () => {
                         <Group position="apart">
                           <Group position="left">
                             <Avatar src={team.avatar} radius="xl">
-                              {team.name?.at(0)}
+                              {team.name?.slice(0, 1)}
                             </Avatar>
                             <Text lineClamp={1}>{team.name}</Text>
                           </Group>
diff --git a/GZCTF/ClientApp/src/pages/admin/games/Index.tsx b/GZCTF/ClientApp/src/pages/admin/games/Index.tsx
index dd92613c9..5b45ab44b 100644
--- a/GZCTF/ClientApp/src/pages/admin/games/Index.tsx
+++ b/GZCTF/ClientApp/src/pages/admin/games/Index.tsx
@@ -129,7 +129,7 @@ const Games: FC = () => {
                             sx={{ cursor: 'pointer' }}
                           >
                             <Avatar src={game.poster} radius={0}>
-                              {game.title?.at(0)}
+                              {game.title?.slice(0, 1)}
                             </Avatar>
                             <Text weight={700} lineClamp={1}>
                               {game.title}
diff --git a/GZCTF/ClientApp/src/pages/posts/[postId]/Index.tsx b/GZCTF/ClientApp/src/pages/posts/[postId]/Index.tsx
index df33e8194..a35fe5fe6 100644
--- a/GZCTF/ClientApp/src/pages/posts/[postId]/Index.tsx
+++ b/GZCTF/ClientApp/src/pages/posts/[postId]/Index.tsx
@@ -53,7 +53,7 @@ const Post: FC = () => {
             {post?.title}
           </Title>
           <Avatar src={post?.autherAvatar} color="brand" radius="xl" size="lg">
-            {post?.autherName?.at(0) ?? 'A'}
+            {post?.autherName?.slice(0, 1) ?? 'A'}
           </Avatar>
           <Text weight={700}>{post?.autherName ?? 'Anonym'}</Text>
           <Stack spacing={2}>
@@ -75,7 +75,7 @@ const Post: FC = () => {
         )}
         <Group spacing={5} mb={100} position="right">
           <Avatar src={post?.autherAvatar} size="sm">
-            {post?.autherName?.at(0) ?? 'A'}
+            {post?.autherName?.slice(0, 1) ?? 'A'}
           </Avatar>
           <Text weight={700}>
             {post?.autherName ?? 'Anonym'} 发布于 {dayjs(post?.time).format('HH:mm, YY/MM/DD')}
diff --git a/GZCTF/ClientApp/vite.config.ts b/GZCTF/ClientApp/vite.config.ts
index ecfede30b..2164a94e0 100644
--- a/GZCTF/ClientApp/vite.config.ts
+++ b/GZCTF/ClientApp/vite.config.ts
@@ -21,9 +21,12 @@ export default defineConfig(({ mode }) => {
         '/hub': { target: TARGET.replace('http', 'ws'), ws: true },
       },
     },
+    preview: {
+      port: 64000
+    },
     build: {
       outDir: 'build',
-      target: ['es2018', 'chrome80'],
+      target: ['es2020', 'chrome86'],
       assetsDir: 'static',
       chunkSizeWarningLimit: 2000,
       rollupOptions: {