show network in sidebar

.vitepress/sidebar.js

@@ -68,6 +68,11 @@ export function main_sidebar() {
       collapsed: true,
       items: [{ text: "8.基础学科", link: "/8.基础学科/8.基础学科" }]
     },
+    {
+      text: "9.计算机网络",
+      collapsed: true,
+      items: [{ text: "9.计算机网络", link: "/9.计算机网络/9.计算机网络" }]
+    },
     {
       text: 'Contributors',
       link: '/contributors'
@@ -637,4 +642,18 @@ export function chapter8() {
       ]
     }
   ]
+}
+
+export function chapter9() {
+  return [
+    { text: '返回上一层', link: '/简介' },
+    {
+      text: '9.计算机网络',
+      collapsed: false,
+      items: [
+        { text: '9.计算机网络', link: '/9.计算机网络/9.计算机网络' },
+        { text: '9.1链路层', link: '/9.计算机网络/9.1链路层' },
+      ]
+    }
+  ]
 }