cookie

function getCookie(key) {
cookies = document.cookie;
if (cookies) {
var start = cookies.indexOf(key + '=');
if (start == -1) { return ''; }
var end = cookies.indexOf(";", start);
if (end == -1) { end = cookies.length; }
end -= start;
var cookie = cookies.substr(start,end);
return unescape(cookie.substr(cookie.indexOf('=') + 1, cookie.length - cookie.indexOf('=') + 1));
}
else { return ''; }
}
/***********设置cookie*********/

function setCookie(key,value,days){
if(days==null || days==""){
days=10;
}
alert(days);
var days =2000;
var exp　= new Date();
exp.setTime(exp.getTime()+ days*24*60*60*1000);
document.cookie=key+"="+escape(value)+";expires="+exp.toUTCString();
}

/*************删除Cookie**********/
function DelCookie(name){
var exp = new Date();
exp.setTime (exp.getTime() - 1);
var cval = getCookie(name);
document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();
}
//setCookie('aaa','asdfdsa',1);
alert(getCookie('aaa'));