var dt= new date();dt.settime(date.gettime() + (3* 60 * 1000));$.cookie('username', 'admin', { expires: dt});

$.removeCookie("username");$.cookie('username',"null");

/*! * jQuery Cookie Plugin v1.4.1 * https://github.com/carhartl/jquery-cookie * * Copyright 2006, 2014 Klaus Hartl * Released under the MIT license */(function (factory) {  if (typeof define === 'function' && define.amd) {    // AMD (Register as an anonymous module)    define(['jquery'], factory);  } else if (typeof exports === 'object') {    // Node/CommonJS    module.exports = factory(require('jquery'));  } else {    // Browser globals    factory(jQuery);  }}(function ($) {  var pluses = //+/g;  function encode(s) {    return config.raw ? s : encodeURIComponent(s);  }  function decode(s) {    return config.raw ? s : decodeURIComponent(s);  }  function stringifyCookieValue(value) {    return encode(config.json ? JSON.stringify(value) : String(value));  }  function parseCookieValue(s) {    if (s.indexOf('"') === 0) {      // This is a quoted cookie as according to RFC2068, unescape...      s = s.slice(1, -1).replace(///"/g, '"').replace(//////g, '//');    }    try {      // Replace server-side written pluses with spaces.      // If we can't decode the cookie, ignore it, it's unusable.      // If we can't parse the cookie, ignore it, it's unusable.      s = decodeURIComponent(s.replace(pluses, ' '));      return config.json ? JSON.parse(s) : s;    } catch(e) {}  }  function read(s, converter) {    var value = config.raw ? s : parseCookieValue(s);    return $.isFunction(converter) ? converter(value) : value;  }  var config = $.cookie = function (key, value, options) {    // Write    if (arguments.length > 1 && !$.isFunction(value)) {      options = $.extend({}, config.defaults, options);      if (typeof options.expires === 'number') {        var days = options.expires, t = options.expires = new Date();        t.setMilliseconds(t.getMilliseconds() + days * 864e+5);      }      return (document.cookie = [        encode(key), '=', stringifyCookieValue(value),        options.expires ? '; expires=' + options.expires.toUTCString() : '', // use expires attribute, max-age is not supported by IE        options.path ? '; path=' + options.path : '',        options.domain ? '; domain=' + options.domain : '',        options.secure ? '; secure' : ''      ].join(''));    }    // Read    var result = key ? undefined : {},      // To prevent the for loop in the first place assign an empty array      // in case there are no cookies at all. Also prevents odd result when      // calling $.cookie().      cookies = document.cookie ? document.cookie.split('; ') : [],      i = 0,      l = cookies.length;    for (; i < l; i++) {      var parts = cookies[i].split('='),        name = decode(parts.shift()),        cookie = parts.join('=');      if (key === name) {        // If second argument (value) is a function it's a converter...        result = read(cookie, value);        break;      }      // Prevent storing a cookie that we couldn't decode.      if (!key && (cookie = read(cookie)) !== undefined) {        result[name] = cookie;      }    }    return result;  };  config.defaults = {};  $.removeCookie = function (key, options) {    // Must not alter options, thus extending a fresh object...    $.cookie(key, '', $.extend({}, options, { expires: -1 }));    return !$.cookie(key);  };}));