[fix] Lobby 初始化清空 Child

assets/Script/Engine/Component/Button/HoldButton.ts

@@ -91,10 +91,12 @@ export default class HoldButton extends cc.Component {
             this._m_pressDeltaTime = 0;
             if (this.OnInvoke != null) {
                 this.OnInvoke.forEach((eventHandler: cc.Component.EventHandler) => {
-                    if (eventHandler.target === <any>"Callback" && eventHandler.component === "Callback" && eventHandler.handler) {
-                        (<Function><unknown>eventHandler.handler)();
-                    } else {
-                        eventHandler.emit([this.node.getComponent(cc.Button)]);
+                    if (eventHandler) {
+                        if (eventHandler.target === <any>"Callback" && eventHandler.component === "Callback" && eventHandler.handler) {
+                            (<Function><unknown>eventHandler.handler)();
+                        } else {
+                            eventHandler.emit([this.node.getComponent(cc.Button)]);
+                        }
                     }
                 });
             }

assets/Script/Engine/Utils/CCExtensions/CCExtension.ts

@@ -39,6 +39,13 @@ declare namespace cc {
         /**位置維持在原位 */
         ExSetParent(parentObj: cc.Node): void;
         ExSetGray(showGray: boolean): void;
+        /**
+         * 通过名称获取节点的子节点。
+         * @param name A name to find the child node.
+         * @example
+         * let child: cc.Node = this.node.Find("childname/childname");
+         */
+        Find(name: string): cc.Node;
     }
 }
 
@@ -184,6 +191,27 @@ cc.Node.prototype.ExSetGray || Object.defineProperty(cc.Node.prototype, 'ExSetGr
         // }
     },
 });
+cc.Node.prototype.Find || Object.defineProperty(cc.Node.prototype, "Find", {
+    enumerable: false,
+    /**
+     * 通过名称获取节点的子节点。
+     * @param name A name to find the child node.
+     */
+    value: function (name: string): any {
+        let names: string[] = name.split("/");
+        let node: cc.Node = this;
+        for (let i: number = 0; i < names.length; i++) {
+            const targetname: string = names[i];
+            let nodeName: string = node.name;
+            node = node.getChildByName(targetname);
+            if (!node) {
+                cc.error(`${nodeName} child hst not found ${targetname} in node`);
+                return null;
+            }
+        }
+        return node;
+    },
+});
 // cc.Node.prototype.SetWorldPosition = function (cocosWorldPos: cc.Vec2): void {
 //     // let cocosWorldPos = new cc.Vec2(unityWorldPos.x + 711, unityWorldPos.y + 400);
 //     this.setPosition(this.parent.convertToNodeSpaceAR(cocosWorldPos));