原生html

 <script>window.addEventListener("beforeunload", function (e) {// 取消事件的默认动作e.preventDefault();// Chrome 需要设置 returnValuee.returnValue = "2333333333";});</script>

React

useEffect(() => {const handleBeforeUnload = (event) => {// 阻止默认行为并显示提示信息event.preventDefault();event.returnValue = '';};window.addEventListener('beforeunload', handleBeforeUnload);return () => {window.removeEventListener('beforeunload', handleBeforeUnload);};}, []);