Enable search feature

docs/.vuepress/config.ts

@@ -1,6 +1,7 @@
 import { defineUserConfig } from "vuepress";
 import { viteBundler } from '@vuepress/bundler-vite'
 import theme from "./theme.js";
+import { searchProPlugin } from "vuepress-plugin-search-pro";
 
 export default defineUserConfig({
   base: "/",
@@ -26,6 +27,21 @@ export default defineUserConfig({
     },
   },
 
+  plugins: [
+      searchProPlugin({
+        indexContent: true,
+        customFields:[
+          {
+            getter: (page) => page.frontmatter.category,
+            formatter: {
+              "/": "分类: $content",
+              "/en/": "Category：$content",
+            },
+          },
+        ]
+      })
+  ],
+
   theme,
 
   shouldPrefetch: false,