初始化

src/utils/myEvent.js

@@ -0,0 +1,37 @@
+class MyEvent {
+	constructor() {
+		// 使用 Object 或 Map 存储，实现 O(1) 级别的查找
+		this.events = new Map()
+	}
+	add(name, call) {
+		if (!this.events.has(name)) {
+			this.events.set(name, [])
+		}
+		this.events.get(name).push(call)
+	}
+	remove(name, call) {
+		if (!this.events.has(name)) return
+
+		if (!call) {
+			this.events.delete(name)
+		} else {
+			const callbacks = this.events.get(name)
+			const index = callbacks.indexOf(call)
+			if (index !== -1) {
+				callbacks.splice(index, 1)
+			}
+			// 如果该事件没有监听者了，彻底清理 key
+			if (callbacks.length === 0) {
+				this.events.delete(name)
+			}
+		}
+	}
+	emit(name, data) {
+		const callbacks = this.events.get(name)
+		if (callbacks) {
+			// 使用 slice() 镜像一份副本，防止在执行回调过程中有 remove 操作导致索引错乱
+			callbacks.slice().forEach((cb) => cb(data))
+		}
+	}
+}
+export default new MyEvent()