create-a-cookie.js

/**
 * Cookie
 * ===========================
 */

var Cookie = {};
 
/**
 * Create a cookie
 *
 * @param {string} name
 * @param {string} value
 * @param {number=} days
 */
Cookie.write = function(name, value, days)
{
	if(days)
	{
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires=" + date.toGMTString();
	}
	else var expires = "";
	document.cookie = name + "=" + value + expires + "; path=/";
}

/**
 * Read a cookie
 *
 * @param {string} name
 * @returns {string|null}
 */
Cookie.read = function(name)
{
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0; i < ca.length; i++)
	{
		var c = ca[i];
		while(c.charAt(0)==' ') c = c.substring(1,c.length);
		if(c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}


Cookie.write(“name”, “craig”, 3);
var name = Cookie.read(“name”);