Código JS Ulitizado
<script language="javascript">
function writeCookie(name, value, time_exp){
if(time_exp != "" ){
var exp = new Date();
var expira = exp.getTime() + (time_exp * 3600000);
exp.setTime(expira);
document.cookie = "" + name + "=" + value + "; expires=" + exp.toGMTString();
}
}
function readCookie(name){
var cookieValue = "";
var search = name + "=";
if(document.cookie.length > 0){
offset = document.cookie.indexOf(search);
if (offset != -1){
offset += search.length;
end = document.cookie.indexOf(";", offset);
if (end == -1) end = document.cookie.length;
cookieValue = unescape(document.cookie.substring(offset, end))
}
}
return cookieValue;
}
valor = prompt("Digite um valor para o cookie",'');
while ( valor == ''){
}
//writeCookie(string:"nome do cookie",string:"valor do cookie",integer:valor de expiração do cookie ex:24, expira em 24 horas);
writeCookie("minha_cookie",valor,24);
//readCookie(string:"nome do cookie");
alert("O valor do seu cookie é: " + readCookie("minha_cookie"));
</script>
Código HTML Utilizado
<html>
<head>
<title>..:[Utilizando Cookies com JavaScript]:..</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body onLoad="document.frm.txtCookie.focus();">
<form name="frm" action="self">
Digite aqui o novo valor para seu cookie:
<input type="text" name="txtCookie">
<input type="button" name="cmdGravarCookie" value="Gravar Cookie" onClick="JavaScript: writeCookie('minha_cookie',document.frm.txtCookie.value,24);document.frm.txtCookie.value = '';">
<input type="button" name="cmdLerCookie" value="Ler Cookie" onClick="JavaScript: alert('O valor do seu cookie é: ' + readCookie('minha_cookie'));">
</form>
</body>
</html>