项目初始化

src/utils/emitter.js

@@ -0,0 +1,25 @@
+import mitt from 'mitt';
+
+class EventEmitter {
+  constructor() {
+    this.emitter = mitt();
+  }
+
+  on(eventName, handler) {
+    this.emitter.on(eventName, handler);
+  }
+
+  off(eventName, handler) {
+    this.emitter.off(eventName, handler);
+  }
+
+  emit(eventName, event) {
+    this.emitter.emit(eventName, event);
+  }
+
+  removeAllListeners() {
+    this.emitter.all.clear();
+  }
+}
+
+export default EventEmitter;