$.cookie('the_cookie'); // 读取 cookie
$.cookie('the_cookie', 'the_value'); // 存储 cookie
$.cookie('the_cookie', 'the_value', { expires: 7 }); // 存储一个带7天期限的 cookie
$.cookie('the_cookie', '', { expires: -1 }); // 删除 cookie

$.cookie("currentMenuID", menuID);

$.cookie("currentMenuID");

$.cookie("currentMenuID", "menuID", { path: "/"});

$.extend({
/**
 1. 设置cookie的值，把name变量的值设为value
example $.cookie('name', 'value');
 2.新建一个cookie 包括有效期 路径 域名等
example $.cookie('name', 'value', {expires: 7, path: '/', domain: 'jquery.com', secure: true});
3.新建cookie
example $.cookie('name', 'value');
4.删除一个cookie
example $.cookie('name', null);
5.取一个cookie(name)值给myvar
var account= $.cookie('name');
**/
  cookieHelper: 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
      }
      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;
    }
  }
});