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How to set cookies using javascript ?

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Show ResultJAVASCRIPT

<!DOCTYPE html>
<html>
<head>
<script>
function GetCookie(name) {
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen) {
var j = i + alen;
if (document.cookie.substring(i, j) == arg)
return getCookieVal(j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
function SetCookie(name, value) {
var argv = SetCookie.arguments;
var argc = SetCookie.arguments.length;
var expires = (argc > 2) ? argv[2] : null;
var path = (argc > 3) ? argv[3] : null;
var domain = (argc > 4) ? argv[4] : null;
var secure = (argc > 5) ? argv[5] : false;
document.cookie = name + "=" + escape(value) +
((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
((path == null) ? "" : ("; path=" + path)) +
((domain == null) ? "" : ("; domain=" + domain)) +
((secure == true) ? "; secure" : "");
}
function DeleteCookie(name) {
var exp = new Date();
exp.setTime(exp.getTime() - 1);
var cval = GetCookie(name);
document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}
var expDays = 30;
var exp = new Date();
exp.setTime(exp.getTime() + (expDays * 24 * 60 * 60 * 1000));
function amt() {
var count = GetCookie('count')
if (count == null) {
SetCookie('count', '1')
return 1
}
else {
var newcount = parseInt(count) + 1;
DeleteCookie('count')
SetCookie('count', newcount, exp)
return count
}
}
function getCookieVal(offset) {
var endstr = document.cookie.indexOf(";", offset);
if (endstr == -1)
endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
</script>
</head>
<body>

<script>
document.write("You've been here <b>" + amt() + "</b> times.");
</script>

</body>
</html>