可兼容IE的jquery.cookie函数方法

前言

  在开发过程中，因为之前有接触过Discuz，就直接拿其common.js里面的getcookie和setcookie方法来使用，做到后面在使用IE来测试的时候，发现这两个方法子啊IE下不起作用，就请教同事，这样就有了jquery.cookie.js文件的由来，里面的代码很少，我贴在下面，方便以后使用和研究吧。

源码

/**

 * 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.

 *

 * @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/[email protected]

 */



/**

 * 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/[email protected]

 */

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

        }

        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;

    }

};