如何捕获浏览器窗口的clsoing事件？

Question

您好我想捕获关闭窗口的事件，并希望删除会话值。经过几次搜索后，我发现onBeforeUnload事件，每当你导航到不同页面或卸载页面时触发事件。重新加载时，将触发此事件，这不是我的要求。我希望所有浏览器中只有特定的窗口关闭事件才能使会话值无效。

Answer 1

Run JavaScript code on window close or page refresh?

/* The most acceptable answer seemed to be as follows in vanilla JS 
   and was addressed at the linked address already.*/    
window.onbeforeunload = closingCode;
function closingCode(){
   //I would capture the URL prior to unload here and if it does NOT
   //exist or is not your url domain then you can unload variables here 
   return false;

}