diff --git a/src/ts/type.ts b/src/ts/type.ts
new file mode 100644
index 0000000..f2ab6e5
--- /dev/null
+++ b/src/ts/type.ts
@@ -0,0 +1,9 @@
+// ValueOf 将对象类型转换成值的枚举值
+// keyof 操作符，遍历对象的key
+export type ValueOf<T> = T[keyof T];
+export const enum1 = {
+  AAA: "aaa",
+  BBB: "bbb",
+} as const;
+// typeof 提取类型
+export type TEnum1 = ValueOf<typeof enum1>;