<script type="text/javascript">
// 创建cookie 修改cookie 指定过期时间
document.cookie = "username=Tom;expires=Thu, 18 Dec 2013 12:00:00 GMT;path=/";
//读取cookie的值
var readcookievalue = document.cookie;
//删除cookie 不必写cookie的值，指定过去的时间即可
document.cookie = "username=;expires=Thu, 18 Dec 2013 12:00:00 GMT;";
//函数设置cookie的值
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;
}
//函数获取cookie
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 "";
}
//检查cookie操作
function checkcookie() {
var user = getcookie("username");
if (user != "") {
alert("welcome again:" + user);
} else {
user = prompt("please enter your name:", "");
if (user != "" && user != null) {
setcookie("username", user, 365);
}
}
}
</script>
