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src/lib/user-id.ts

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+/**
+ * 用户ID管理工具
+ * 为每个匿名用户生成永久userid并存储到localStorage
+ */
+
+const USER_ID_KEY = 'a_stock_tracker_user_id';
+
+/**
+ * 获取或生成用户ID
+ * 如果localStorage中已有则返回，否则生成新的UUID
+ */
+export function getUserId(): string {
+  if (typeof window === 'undefined') {
+    return '';
+  }
+
+  let userId = localStorage.getItem(USER_ID_KEY);
+  
+  if (!userId) {
+    // 生成UUID v4
+    userId = crypto.randomUUID ? crypto.randomUUID() : generateUUID();
+    localStorage.setItem(USER_ID_KEY, userId);
+  }
+  
+  return userId;
+}
+
+/**
+ * 手动生成UUID v4（兼容不支持crypto.randomUUID的环境）
+ */
+function generateUUID(): string {
+  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
+    const r = Math.random() * 16 | 0;
+    const v = c === 'x' ? r : (r & 0x3 | 0x8);
+    return v.toString(16);
+  });
+}
+
+/**
+ * 更新最后访问时间
+ */
+export function updateLastAccessed(collectionId: number): void {
+  const key = `last_accessed_${collectionId}`;
+  localStorage.setItem(key, new Date().toISOString());
+}
+
+/**
+ * 获取最后访问时间
+ */
+export function getLastAccessed(collectionId: number): string | null {
+  const key = `last_accessed_${collectionId}`;
+  return localStorage.getItem(key);
+}