JQuery的Cookie插件

最新推荐文章于 2024-08-09 07:58:04 发布

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最新推荐文章于 2024-08-09 07:58:04 发布

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原文链接：https://www.mk2048.com/blog/blog.php?id=hb0j12j2jbcb&title=JQuery%E7%9A%84Cookie%E6%8F%92%E4%BB%B6

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本文详细介绍了 jQuery Cookie 插件的使用方法，包括如何设置、获取和删除 cookie，以及如何利用各种选项来定制 cookie 的行为。通过示例代码展示了不同场景下 cookie 的操作，适合前端开发者学习和应用。

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View Code

/* *
* 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.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;
    }
};

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