init

src/example/exp7.ts

@@ -0,0 +1,57 @@
+export const exp7 = () => {
+
+    const userService = new UserService();
+    userService.delete(1);
+    console.log(userService.getUsers());
+
+};
+
+type NewType = {
+    id: number;
+    username: string;
+};
+const parseConf: ((...args: any[]) => any)[] = [];
+
+export const parse =
+    (parseTo: (...args: any[]) => any) =>
+        (target: any, propertyName: string, index: number) => {
+            parseConf[index] = parseTo;
+        };
+
+
+class UserService {
+    private users: NewType[] = [
+        { id: 1, username: 'admin' },
+        { id: 2, username: 'pincman' },
+    ];
+
+    getUsers() {
+        return this.users;
+    }
+
+    @parseDecorator
+    delete(@parse((arg: any) => Number(arg)) id: number) {
+        this.users = this.users.filter((userObj) => userObj.id !== id);
+        return this;
+    }
+}
+
+// 在函数调用前执行格式化操作
+export const parseDecorator = (
+    target: any,
+    propertyName: string,
+    descriptor: PropertyDescriptor,
+): PropertyDescriptor => {
+    console.log('开始格式化数据');
+    return {
+        ...descriptor,
+        value(...args: any[]) {
+            // 获取格式化后的参数列表
+            const newArgs = args.map((v, i) =>
+                parseConf[i] ? parseConf[i](v) : v,
+            );
+            console.log('格式化完毕');
+            return descriptor.value.apply(this, newArgs);
+        },
+    };
+};