$.cookie('the_cookie','the_value',{  expires:7,   path:'/',  domain:'jquery.com',  secure:true})　

$.cookie('the_cookie', 'the_value');

$.cookie('the_cookie', 'the_value', {expires: 7});

$.cookie('the_cookie');

$.cookie('the_cookie', null);

/** * Cookie plugin * * Copyright (c) 2006 Klaus Hartl (stilbuero.de) * Dual licensed under the MIT and GPL licenses: * http://www.opensource.org/licenses/mit-license.php * http://www.gnu.org/licenses/gpl.html * *//** * Create a cookie with the given name and value and other optional parameters. * * @example $.cookie('the_cookie', 'the_value'); * @desc Set the value of a cookie. * @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); * @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain * used when the cookie was set. * * @param String name The name of the cookie. * @param String value The value of the cookie. * @param Object options An object literal containing key/value pairs to provide optional cookie attributes. * @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object. *    If a negative value is specified (e.g. a date in the past), the cookie will be deleted. *    If set to null or omitted, the cookie will be a session cookie and will not be retained *    when the the browser exits. * @option String path The value of the path atribute of the cookie (default: path of page that created the cookie). * @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie). * @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will *   require a secure protocol (like HTTPS). * @type undefined * * @name $.cookie * @cat Plugins/Cookie * @author Klaus Hartl/klaus.hartl@stilbuero.de *//** * Get the value of a cookie with the given name. * * @example $.cookie('the_cookie'); * @desc Get the value of a cookie. * * @param String name The name of the cookie. * @return The value of the cookie. * @type String * * @name $.cookie * @cat Plugins/Cookie * @author Klaus Hartl/klaus.hartl@stilbuero.de */jQuery.cookie = function(name, value, options) { if (typeof value != 'undefined') { // name and value given, set cookie options = options || {}; if (value === null) {  value = '';  options = $.extend({}, options); // clone object since it's unexpected behavior if the expired property were changed  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 } // NOTE 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; }};