//cookiedomain cookie域 默认空即可
//cookiepre   cookie名称前缀 
//cookiepath 默认/
//seconds cookie过期时间 单位：秒
var cookiedomain = '', cookiepre = 'xyz_', cookiepath = '/';

function setcookie(cookieName, cookieValue, seconds, path, domain, secure) {
	var expires = new Date();

	if(cookieValue == '' || seconds < 0) {
		cookieValue = '';
		seconds = -2592000;
	}
	expires.setTime(expires.getTime() + seconds * 1000);
	domain = !domain ? cookiedomain : domain;
	path = !path ? cookiepath : path;
	document.cookie = escape(cookiepre + cookieName) + '=' + escape(cookieValue)
		+ (expires ? '; expires=' + expires.toGMTString() : '')
		+ (path ? '; path=' + path : '/')
		+ (domain ? '; domain=' + domain : '')
		+ (secure ? '; secure' : '');
}

function getcookie(name, nounescape) {
	name = cookiepre + name;
	var cookie_start = document.cookie.indexOf(name);
	var cookie_end = document.cookie.indexOf(";", cookie_start);
	if(cookie_start == -1) {
		return '';
	} else {
		var v = document.cookie.substring(cookie_start + name.length + 1, (cookie_end > cookie_start ? cookie_end : document.cookie.length));
		return !nounescape ? unescape(v) : v;
	}
}