js监听页面的刷新

var  n  =  window.event.screenX  -  window.screenLeft; 
var  b  =  n  >  document.documentElement.scrollWidth-20; 
if (b  &&  window.event.clientY  <  0  ||  window.event.altKey) {
//页面关闭
} else {
//页面刷新
}

文章来源于:https://blog.csdn.net/qq_43598475/article/details/103055018