ts and assignPropValue

src/ts/handle.ts

@@ -0,0 +1,16 @@
+// keyof 操作符，遍历对象的key
+export type keys<T> = keyof T;
+
+const a = { a: 1, b: 2, c: 3 };
+
+// typeof 提取类型
+export type Ta = keys<typeof a>;
+
+// Omit 去除某一项
+export type Ta2 = Omit<typeof a, "b">;
+
+// Pick 选择某一项
+export type Ta3 = Pick<typeof a, "c">;
+
+// & 添加
+export type Ta4 = Ta3 & { d: string };