您需要在生命周期方法内调用该方法：
componentDidMount() { window.addEventListener("beforeunload", this.handleWindowBeforeUnload);}componentWillUnmount() { window.removeEventListener("beforeunload", this.handleWindowBeforeUnload);}
您需要在生命周期方法内调用该方法：
componentDidMount() { window.addEventListener("beforeunload", this.handleWindowBeforeUnload);}componentWillUnmount() { window.removeEventListener("beforeunload", this.handleWindowBeforeUnload);}名师互学网 版权所有 (c)2021-2022 ICP备案号：晋ICP备2021003244-6号
