diff --git a/miniprogram/core/Api.ts b/miniprogram/core/Api.ts
index 05111ac..1105471 100644
--- a/miniprogram/core/Api.ts
+++ b/miniprogram/core/Api.ts
@@ -1,4 +1,4 @@
-import { Emitter, EventType } from "./Emitter";
+import { Emitter, EventType, EventMixin } from "./Emitter";
 import { API_FAILED_SHOW_MESSAGE } from "./Config";
 import { Logger, LogLabel, LevelLogLabel, colorRadio, StatusLabel } from "./Logger";
 interface IAppAPIParam {
@@ -156,16 +156,7 @@ class API<
     O extends IAnyData = IAnyData,
     E extends Record<EventType, any> = Record<EventType, any>,
     U extends IAnyData = IAnyData
-> extends Emitter <
-    {
-        // 这个复杂的泛型是为了 MixIn 用户自定义事件类型
-        // 懂得如何使用就可以了
-        // 不要试图去理解下面这三行代码，真正的恶魔在等着你
-        [P in (keyof (IAPIEvent<I, O> & IAPIResultEvent<O, U>) | keyof E)] : 
-        P extends keyof IAPIEvent<I, O> ? IAPIEvent<I, O>[P] : 
-        P extends keyof IAPIResultEvent<O, U> ? IAPIResultEvent<O, U>[P] : E[P]
-    }
-> {
+> extends Emitter<EventMixin<IAPIEvent<I, O> & IAPIResultEvent<O, U>, E>> {
 
     /**
      * 默认调试标签
diff --git a/miniprogram/core/Emitter.ts b/miniprogram/core/Emitter.ts
index c649a83..1bfd2a7 100644
--- a/miniprogram/core/Emitter.ts
+++ b/miniprogram/core/Emitter.ts
@@ -15,7 +15,18 @@ export type EventHandlerMap<Events extends Record<EventType, any>> = Map<
 
 // Emitter function type
 type IEmitParamType<E extends Record<EventType, any>, K extends keyof E> = 
-	E[K] extends ( undefined | void ) ? [K] : [K, E[K]];
+	E[K] extends ( undefined | void ) ? [type: K] : [type: K, evt: E[K]];
+
+// Mixin to event object
+export type EventMixin<A extends Record<EventType, any>, B extends Record<EventType, any>> = {
+	[P in (keyof A | keyof B)] :
+		P extends (keyof A & keyof B) ? 
+			A[P] : 
+			P extends keyof A ? 
+				A[P] : 
+				P extends keyof B ? B[P] : 
+			never;
+}
 
 export class Emitter<Events extends Record<EventType, any>> {