基于jqury的Cookie插件

/**
*功能：客户端cookie函数相关操作组件,标准第三方组件
*使用方法：
* @example $.cookie('the_cookie', 'the_value');
* @设置cokie.
* @example $.cookie('the_cookie', 'the_value', { expires: 7, path: '/', domain: 'jquery.com', secure: true });
* @desc Create a cookie with all available options.
* @example $.cookie('the_cookie', 'the_value');
* @desc Create a session cookie.
* @example $.cookie('the_cookie', null);
*/
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(); // 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) : '';
       var domain = options.domain ? '; domain=' + (options.domain) : '';
       var secure = options.secure ? '; secure' : '';
       document.cookie = [name, '=', encodeURIComponent(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));
                   break;
               }
           }
       }
       return cookieValue;
   }
};