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已挂载 Laya.RigidBody 的节点，可以直接挂载脚本并声明 onTriggerEnter、onTriggerStay、onTriggerExit 函数

const { regClass, property } = Laya;

@regClass()
export class PlayerBullet extends Laya.Script {

    declare owner: Laya.Sprite;
    private _body: Laya.RigidBody;
   
    onAwake(): void {
        this._body = this.owner.getComponent(Laya.RigidBody);
    }

    /** 3D物理触发器事件与2D物理碰撞事件，开始碰撞时执行 */
    onTriggerEnter(other: Laya.PhysicsColliderComponent | Laya.ColliderBase, self?: Laya.ColliderBase, contact?: any): void {
        let info = contact.getHitInfo();
        // 取消碰撞
        contact.SetEnabled(false);
        // 获取碰撞平面的法线
        console.log(info.normal.x info.normal.y);
    }
    
    /** 3D物理触发器事件与2D物理碰撞事件，持续碰撞时执行 */
    onTriggerStay(other: Laya.PhysicsColliderComponent | Laya.ColliderBase, self?: Laya.ColliderBase, contact?: any): void {
        
    }
        
    /** 3D物理触发器事件与2D物理碰撞事件，结束碰撞时执行 */
    onTriggerExit(other: Laya.PhysicsColliderComponent | Laya.ColliderBase, self?: Laya.ColliderBase, contact?: any): void {
        
    }

}

如果是挂载脚本的节点的子节点添加 Laya.RigidBody 组件，此时用：bodyNode.on(Laya.Event.TRIGGER_ENTER, ...) 方法, 如：

this.bodyNode.on(Laya.Event.TRIGGER_ENTER, this, this.onTriggerEnter);
this.bodyNode.on(Laya.Event.TRIGGER_STAY, this, this.onTriggerStay);
this.bodyNode.on(Laya.Event.TRIGGER_EXIT, this, this.onTriggerExit);

// 不用时，使用 off() 移除侦听
//this.bodyNode.off(Laya.Event.TRIGGER_ENTER, this, this.onTriggerEnter);
//this.bodyNode.off(Laya.Event.TRIGGER_STAY, this, this.onTriggerStay);
//this.bodyNode.off(Laya.Event.TRIGGER_EXIT, this, this.onTriggerExit);

onTriggerEnter(other: Laya.PhysicsColliderComponent | Laya.ColliderBase, self?: Laya.ColliderBase, contact?: any):void{
    console.log(contact);
}

onTriggerStay(other: Laya.PhysicsColliderComponent | Laya.ColliderBase, self?: Laya.ColliderBase, contact?: any): void {
    
}

onTriggerExit(other: Laya.PhysicsColliderComponent | Laya.ColliderBase, self?: Laya.ColliderBase, contact?: any): void {
    
}