data.chinahighlights.com/js/jquery.cookies.js

/**
 * jquery cookie插件
 * 使用：
 * $.cookie('key'); //读取Cookie值
 * $.cookie('key', 'value'); // 设置/新建cookie的值  b=123&b=345
 * $.cookie('key', 'value', {expires: 7, path: '/', domain: 'dh89.com', secure: true});//新建一个cookie 包括有效期(天数) 路径 域名等
 * $.cookie('key', null); //删除一个cookie
 */
jQuery.cookie = function(name, value, options) {
     if (typeof value != 'undefined') { // name and value given, set cookie
         options = options || {};
         if (value === null) {
             value = '';
             options.expires = -1;
         }
         var expires = '';
         if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
             var date;
             if (typeof options.expires == 'number') {
                 date = new Date();
                 date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
             } else {
                 date = options.expires;
             }
             expires = '; expires=' + date.toUTCString();
         }
         var path = options.path ? '; path=' + (options.path) : '';
         var domain = options.domain ? '; domain=' + (options.domain) : '';
         var secure = options.secure ? '; secure' : '';
         document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
     } else {
         var cookieValue = null;
         if (document.cookie && document.cookie != '') {
             var cookies = document.cookie.split(';');
             for (var i = 0; i < cookies.length; i++) {
                 var cookie = jQuery.trim(cookies[i]);
                 if (cookie.substring(0, name.length + 1) == (name + '=')) {
                     cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                     break;
                 }
             }
         }
         return cookieValue;
     }
 };
/**************************************************
参数说明：
sMainName Cookie名
sSubName Cookie子键名，留空表示单值Cookie
**************************************************/
function GetCookie(sMainName, sSubName)
{
    var re = new RegExp((sSubName ? sMainName + "=(?:.*?&)*?" + sSubName + "=([^&;$]*)" : sMainName + "=([^;$]*)"),"i");
    return re.test(unescape(document.cookie)) ? RegExp["$1"] : "";
}