关于 如何判断-浏览器首次访问判断

关于 如何判断-浏览器首次访问判断

没看懂，只会用，先记下来，~汗！！！！

<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<meta charset="utf-8">
<title>页面首次访问判断</title>
</head>
<body> 
<h1><a href="http://www.thevv.top">GO</a></h1> 

<script language ="javascript" type ="text/javascript" >    
//1浏览器关闭则window.name为空，可以实现跨域，数据传递         
alert((window.name == "" ? "是" : "不是") + "第一次开这个窗口！")
window.name = "00";
//cookie判断
function setCookie(cname, cvalue, exdays) {
	var d = new Date();
	d.setTime(d.getTime() + (exdays * 24 * 60 * 60 * 1000));
	var expires = "expires=" + d.toGMTString();
	document.cookie = cname + "=" + cvalue + "; " + expires;
}
function getCookie(cname) {
	var name = cname + "=";
	var ca = document.cookie.split(';');
	for (var i = 0; i < ca.length; i++) {
		var c = ca[i].trim();
		if (c.indexOf(name) == 0) return c.substring(name.length, c.length);
	}
	return "";
}

function checkCookie() {
	var user = getCookie("username");
	if (user != "") {
		//不是首次访问 
		alert("Welcome again " + user);
	} else {
		//首次访问 
		user = prompt("Please enter your name:", "");
		if (user != "" && user != null) {
			setCookie("username", user, 2 / (3600 * 24));
		}
	}
}
window.onload = function() {
	checkCookie()
}
   </script>
   </body></html>
posted @ 2017-08-14 23:00  我的五年  阅读(23)  评论(0)    收藏  举报  来源