fix:修复打包失败的问题

docs/.vitepress/theme/utils/index.ts

@@ -1,7 +1,7 @@
 const pattern
     = /[a-zA-Z0-9_\u0392-\u03C9\u00C0-\u00FF\u0600-\u06FF\u0400-\u04FF]+|[\u4E00-\u9FFF\u3400-\u4DBF\uF900-\uFAFF\u3040-\u309F\uAC00-\uD7AF]+/g
 
-export function countWord(data: string) {
+export const countWord = (data: string)=> {
     const m = data.match(pattern)
     let count = 0
     if (!m) {
@@ -16,4 +16,18 @@ export function countWord(data: string) {
         }
     }
     return count
+}
+
+/**
+ * 判断是否为移动端
+ */
+export const isMobile = (): boolean => {
+    if (typeof window === 'undefined') {
+        return false;
+    }
+
+    const userAgent = navigator.userAgent;
+    const mobileRegex = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i;
+
+    return mobileRegex.test(userAgent);
 }