TargetTarget.openerVersion: 23.2.0On this pageTarget.opener() 方法 ¥Target.opener() method 获取打开此目标的目标。顶层目标返回 null。 ¥Get the target that opened this target. Top-level targets return null. 签名 ¥Signature class Target { abstract opener(): Target | undefined;} Returns: Target | undefined