javascript操作cookie的demo
<html>
<head>
<script type="text/javascript">
function getCookie(c_name) {
if (document.cookie.length > 0) {
c_start = document.cookie.indexOf(c_name + "=");
if (c_start != -1) {
c_start = c_start + c_name.length + 1;
c_end = document.cookie.indexOf(";", c_start);
if (c_end == -1) {
c_end = document.cookie.length;
}
return unescape(document.cookie.substring(c_start, c_end));
}
}
return ""
}
function setCookie(c_name, value, second) {
var mSecond = new Date().getTime();
mSecond = mSecond + second*1000;
var exdate = new Date();
exdate.setTime(mSecond);
document.cookie = c_name + "=" + escape(value) + ((second == null) ? "" : ";expires=" + exdate.toGMTString())+";path=/";
}
function checkCookie() {
username = getCookie('username');
if (username != null && username != "") {
alert('Welcome again ' + username + '!');
} else {
username = prompt('Please enter your name:', "");
if (username != null && username != "") {
setCookie('username', username, 10);
}
}
}
</script>
</head>
<body onLoad="checkCookie()">
</body>
</html>