the demo

assets/Scripts/core/event/EventManager.ts

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+import ArrayUtil from "../utils/ArrayUtil";
+
+interface EventInfo {
+    func: Function;
+    target: any;
+}
+
+class EventInfoList {
+    infos: EventInfo[] = null;
+    constructor() {
+        this.infos = [];
+    }
+
+    has(cb: Function, target: any) {
+        if (this.infos.length <= 0) {
+            return false;
+        }
+        for (let i = 0; i < this.infos.length; i++) {
+            if (this.infos[i].func === cb && this.infos[i].target === target) {
+                return true;
+            }
+        }
+        return false;
+    }
+    /**
+     * 添加事件
+     * @param cb  回调
+     * @param target 目标
+     */
+    add(cb: Function, target: any) {
+        if (this.has(cb, target)) {
+            console.log('event repeat--------')
+            return;
+        }
+        let info = Object.create(null);
+        info.func = cb;
+        info.target = target;
+
+        this.infos.push(info);
+    }
+
+    /**移除指定 */
+    remove(cb: Function, target: any) {
+
+        if (this.infos.length <= 0) {
+            return;
+        }
+        for (let i = 0; i < this.infos.length; i++) {
+            if (this.infos[i].func === cb && this.infos[i].target === target) {
+                ArrayUtil.fastRemoveAt(this.infos, i);
+                break;
+            }
+        }
+    }
+    /**移除目标所有 */
+    removeByTarget(target: any) {
+        if (this.infos.length <= 0) {
+            return;
+        }
+
+        for (let i = 0; i < this.infos.length; i++) {
+            if (this.infos[i].target === target) {
+                ArrayUtil.fastRemoveAt(this.infos, i);
+                i--;
+            }
+        }
+    }
+
+    /**移除所有 */
+    removeAll() {
+        this.infos.forEach(info => {
+            info.func = null;
+            info.target = null;
+        })
+        this.infos = [];
+    }
+
+}
+
+export class EventManager {
+    private _evtMap: { [k: string]: EventInfoList } = Object.create(null);
+    on(evtType: string, cb: Function, target?: any) {
+        let list = this._evtMap[evtType];
+        if (!list) {
+            list = new EventInfoList();
+            this._evtMap[evtType] = list;
+        }
+        list.add(cb, target);
+    }
+
+    emit(evtType: string, ...params: any) {
+        let list = this._evtMap[evtType];
+        if (!list || list.infos.length <= 0) {
+            return;
+        }
+        for (let i = 0; i < list.infos.length; i++) {
+            let info = list.infos[i];
+            if (info.func) {
+                info.func.apply(info.target, params);
+            }
+        }
+    }
+
+    /**移除 指定*/
+    off(evtType: string, cb: Function, target?: any) {
+        let list = this._evtMap[evtType];
+        if (!list) return;
+        list.remove(cb, target);
+    }
+
+    /**事件名或目标移除 */
+    offByKeyOrTarget(key: string | Object) {
+        let list: EventInfoList = null;
+        if (typeof key == 'string') {
+            list = this._evtMap[key];
+            if (list) {
+                list.removeAll();
+            }
+        } else {
+
+            for (let k in this._evtMap) {
+                list = this._evtMap[k];
+                list.removeByTarget(key);
+            }
+        }
+    }
+
+}
+
+/**
+ * [1] Class member could be defined like this.
+ * [2] Use `property` decorator if your want the member to be serializable.
+ * [3] Your initialization goes here.
+ * [4] Your update function goes here.
+ *
+ * Learn more about scripting: https://docs.cocos.com/creator/3.4/manual/zh/scripting/
+ * Learn more about CCClass: https://docs.cocos.com/creator/3.4/manual/zh/scripting/ccclass.html
+ * Learn more about life-cycle callbacks: https://docs.cocos.com/creator/3.4/manual/zh/scripting/life-cycle-callbacks.html
+ */

assets/Scripts/core/event/EventManager.ts.meta

@@ -0,0 +1,11 @@
+{
+  "ver": "4.0.23",
+  "importer": "typescript",
+  "imported": true,
+  "uuid": "8069a6da-1c33-4e0f-bd20-cbe42cdf93c0",
+  "files": [],
+  "subMetas": {},
+  "userData": {
+    "simulateGlobals": []
+  }
+}