javascript 操作cookie

function setCookie(name,value,expires,path,domain,secure) {
	var cookieName = encodeURIComponent(name)+'='+encodeURIComponent(value);
	if(expires instanceof Date) {
		cookieName += '; expires = '+expires;
	}
	if(path) {
		cookieName +='; path='+path; 
	}
	if(domain) {
		cookieName +='; domain='+domain; 
	}
	if(secure) {
		cookieName +='; domain'; 
	}
	document.cookie = cookieName;
}

function  setCookieDate(day) {
	var date = null;
	if(typeof day == 'number' && day > 0) {
		date = new Date();
		date.setDate(date.getDate()+day);
	} else {
		throw new Error('数字不合法，必须大于0');
	}
	return date.toUTCString();
}

function removeCookie(name) {
	setCookie(name,'1',-1);	
}

function getCookie(name) {
    var arr = document.cookie.split(';'),i=0;
	for(i=0;i<arr.length;i++) {
		var arr2 = arr[i].split('=');
		if(encodeURIComponent(arr2[0]) == encodeURIComponent(name)) {
			return decodeURIComponent(arr2[1]);
		}
	}
	return "";
}