看看JavaScripts onbeforeunload函数。



在这篇文章中可以找到一个很好的解释返回基础知识 - OnBeforeUnload事件 [ ^ ]



示例用法：

Have a look at JavaScripts onbeforeunload function.

A good explanation can be found in this article Back to Basics – OnBeforeUnload Event[^]

Example usage:

window.onbeforeunload = function(e) {
  return 'Are you sure you want to leave page';
};

...希望它有所帮助。

... hope it helps.