diff --git a/src/id.ts b/src/id.ts
new file mode 100644
index 0000000..49bcb92
--- /dev/null
+++ b/src/id.ts
@@ -0,0 +1,21 @@
+/**
+ * nanoid 中导出 {@link https://github.com/ai/nanoid}
+ */
+const urlAlphabet = 'useandom-26T198340PX75pxJACKVERYMINDBUSHWOLF_GQZbfghjklqvwyzrict'
+
+/**
+ * 生成简易 {@link https://github.com/ai/nanoid|nanoid}，使用 nanoid 中导出的字母表
+ *
+ * @param size
+ * @param dict
+ * @returns id
+ * @example nid() // => 'nZZyknCBT5ra_gGE'
+ */
+export function nid(size = 16, dict = urlAlphabet): string {
+  let id = ''
+  let i = size
+  const len = dict.length
+  while (i--)
+    id += dict[(Math.random() * len) | 0]
+  return id
+}
diff --git a/src/string.ts b/src/string.ts
index cfd59cb..242e4ca 100644
--- a/src/string.ts
+++ b/src/string.ts
@@ -1,24 +1,3 @@
-/**
- * nanoid 中导出 {@link https://github.com/ai/nanoid}
- */
-const urlAlphabet = 'useandom-26T198340PX75pxJACKVERYMINDBUSHWOLF_GQZbfghjklqvwyzrict'
-
-/**
- * 生成随机字符串
- * @param size
- * @param dict
- * @returns 随机字符串
- * @example randomStr() // => 'nZZyknCBT5ra_gGE'
- */
-export function randomStr(size = 16, dict = urlAlphabet): string {
-  let id = ''
-  let i = size
-  const len = dict.length
-  while (i--)
-    id += dict[(Math.random() * len) | 0]
-  return id
-}
-
 /**
  * 将字符串中的 \ 转换为 /
  * @param str
diff --git a/test/id.test.ts b/test/id.test.ts
new file mode 100644
index 0000000..886f9b3
--- /dev/null
+++ b/test/id.test.ts
@@ -0,0 +1,10 @@
+import { describe, expect, it } from 'vitest'
+import { nid } from '../src/id'
+
+describe('string', () => {
+  describe('nid Function', () => {
+    it('应该生成随机字符串', () => {
+      expect(nid()).toHaveLength(16)
+    })
+  })
+})
diff --git a/test/string.test.ts b/test/string.test.ts
index 0380b10..09b1d44 100644
--- a/test/string.test.ts
+++ b/test/string.test.ts
@@ -2,7 +2,6 @@ import { describe, expect, it } from 'vitest'
 import {
   ensurePrefix,
   ensureSuffix,
-  randomStr,
   slash,
   trim,
   trimAll,
@@ -11,12 +10,6 @@ import {
 } from '../src/string'
 
 describe('string', () => {
-  describe('randomStr Function', () => {
-    it('应该生成随机字符串', () => {
-      expect(randomStr()).toHaveLength(16)
-    })
-  })
-
   describe('slash Function', () => {
     it('应该将字符串中的 \ 转换为 /', () => {
       expect(slash('hello\\world')).toBe('hello/world')