/**
* Cookie plugin
*
* Copyright (c) 2006 ziqiu.zhang 
* Dual licensed under the MIT and GPL licenses:
* http://www.opensource.org/licenses/mit-license.php
* http://www.gnu.org/licenses/gpl.html
* 使用举例：
    //注： 写入时，subName参数请传递空值或null
    //写入Cookies-值为字符串，即不包含子键
    $.cookie("singleKey", "", "singleKey-value", { expires: 1, path: "/", secure: false })
    //读取Cookies-根据主键
    alert("singleKey:" + $.cookie("singleKey"));

    //写入Cookies-值为对象，则每个属性名为子键的名称，属性值为子键值
    var subNameObj = { subName1: "aaa", subName2: "bbb", subName3: "ccc" };
    $.cookie("multiKey", "", subNameObj, { expires: 1, path: "/", secure: false });
    //读取Cookies-根据主键
    alert("multiKey:" + $.cookie("multiKey"));
    //读取Cookies-根据主键和子键
    alert("multiKey,subName1:" + $.cookie("multiKey", "subName1"));
*
*/

jQuery.cookie = function(name, subName, value, options)
{
	if (typeof value != 'undefined')
	{ // name and value given, set cookie
		options = options || {};
		if (value === null)
		{
			value = '';
			options.expires = -1;
		}
		var expires = '';
		if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString))
		{
			var date;
			if (typeof options.expires == 'number')
			{
				date = new Date();
				date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
			} else
			{
				date = options.expires;
			}
			expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
		}
		// CAUTION: Needed to parenthesize options.path and options.domain
		// in the following expressions, otherwise they evaluate to undefined
		// in the packed version for some reason...
		var path = options.path ? '; path=' + (options.path) : ';path=/';
		var domain = options.domain ? '; domain=' + (options.domain) : '';
		var secure = options.secure ? '; secure' : '';
	
		//If value is an object, each property will be a sub key;
		if (typeof value == "object")
		{
			var k = 0;
			var tempResult = "";
			for (var tempValue in value)
			{
				if (k > 0)
				{
					tempResult += "&";
				}
				tempResult += tempValue + "=" + encodeURIComponent(value[tempValue]);
				k++;
			}
			value = tempResult;
		}
		else
		{
			value = encodeURIComponent(value);
		}

		document.cookie = [name, '=', value, expires, path, domain, secure].join('');
	} else
	{ // only name given, get cookie
		var cookieValue = null;
		if (document.cookie && document.cookie != '')
		{
			var cookies = document.cookie.split(';');
			for (var i = 0; i < cookies.length; i++)
			{
				var cookie = jQuery.trim(cookies[i]);
				// Does this cookie string begin with the name we want?
				if (cookie.substring(0, name.length + 1) == (name + '='))
				{
					cookieValue = decodeURIComponent(cookie.substring(name.length + 1));

					//Search sub key
					if (typeof subName != 'undefined' && subName != null && subName != "")
					{
						var subCookies = cookieValue.toString().split('&');
						for (var j = 0; j < subCookies.length; j++)
						{
							var subCookie = jQuery.trim(subCookies[j]);
							if (subCookie.substring(0, subName.length + 1) == (subName + '='))
							{
								cookieValue = decodeURIComponent(subCookie.substring(subName.length + 1));
								break;
							}
						}
					}

					break;
				}

			}
		}
		return cookieValue;
	}
};