js判断页面是关闭还是刷新

window.onunload = function(){
var a_n = window.event.screenX - window.screenLeft;
var a_b = a_n > document.documentElement.scrollWidth-20;
if(a_b && window.event.clientY< 0 || window.event.altKey){
alert('关闭页面行为');
}else{
alert('跳转或者刷新页面行为');
}
}

function CloseOpen(event) {
if(event.clientX<=0 || event.clientY<0) {
//获取当前时间
var date=new Date();
//将date设置为过去的时间
alert("关闭网页");
date.setTime(date.getTime()-10000);
//将userId这个cookie删除
document.cookie="zhuangtao;expire="+date.toUTCString();
document.cookie="quanxianzifucuan;expire="+date.toUTCString();
document.cookie="quanxian;expire="+date.toUTCString();
s0 += "关闭窗口!"; sw = 1;
onbeforeunload();
// window.event.returnValue = '关闭浏览器将退出系统.';
}
else
{
alert("刷新或离开");
}
}

var currentKeyCode = -1;

function document.onkeydown() { // 本窗口的所有下属页面都必须含有本函数

top.currentKeyCode = event.keyCode;
}

function onbeforeunload(){

var sw = 0, s0 = "";
if (currentKeyCode == 116)
{
s0 += "刷新窗口!(F5)";
}
else
{
if ((event.altKey)&&(currentKeyCode == 115))
{
s0 += "关闭窗口!(alt+F4)"; sw = 1;
//获取当前时间
var date=new Date();
//将date设置为过去的时间
alert("关闭窗口");
date.setTime(date.getTime()-10000);
//将userId这个cookie删除
document.cookie="zhuangtao;expire="+date.toUTCString();
document.cookie="quanxianzifucuan;expire="+date.toUTCString();
document.cookie="quanxian;expire="+date.toUTCString();
}
else
{
if ((event.clientX > 0)&&(event.clientX < document.body.clientWidth))
{
s0 += "刷新窗口!";
}
else
{
//获取当前时间
var date=new Date();
//将date设置为过去的时间
alert("关闭网页");
date.setTime(date.getTime()-10000);
//将userId这个cookie删除
document.cookie="zhuangtao;expire="+date.toUTCString();
document.cookie="quanxianzifucuan;expire="+date.toUTCString();
document.cookie="quanxian;expire="+date.toUTCString();
s0 += "关闭窗口!"; sw = 1;
}
}
}
if (sw == 1)
{
event.returnValue = "";
}
else
{
currentKeyCode = -1;
}

}