cookie插件|jq-cookie.js|使用详解

1、设置一二级域名共用的cookie:设置domain为一级域名,可一、二级域名共用的cookie

$.cookie(‘f_city‘,‘北京|101010100|,锦州|101070701|‘,{expires: 999, path: ‘/‘,domain: ‘weather.com.cn‘})

 

2、删除同名不同域的cookie (一个页面中.weather.com.cn域 和 www.weather.com.cn域下,都有f_city这个值,怎么删除其中任一)

$.cookie(‘f_city‘,null,{ path: ‘/‘})   //删除当前域 www.weather.com.cn域下的 f_city
$.cookie(‘f_city‘,null,{ path: ‘/‘, domain: ‘weather.com.cn‘})   //删除 .weather.com.cn域下的 f_city

 

3、读取cookie$.cookie(‘f_city‘),当读取cookie键值为 f_city 的值时,如果有不同域下的多个f_city,则读取创建最早的f_city值,而与域无关

var cookie_f_city= $.cookie(‘f_city‘); //读取cookie只有一种写法,不接受{domain}参数,也就是说,当有域同名参数时,只读创建最早的 f_city

 

 

 

=======================

下面是jq-cookie这个插件的源码

/**
 * 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
 *
 */

/**
 *
 *1、设置cookie的值,比如我们要设置变量名为userid对应值为123的cookie,代码如下:
 * $.cookie(‘userid‘,‘123‘);
 *
 *2、新建一个cookie,并设置cookie的有效期 路径 域名等,代码如下:
 * $.cookie(‘userid, ‘123‘, {expires: 7, path: ‘/‘, domain: ‘jquery.com‘, secure: true});注意:如果去掉后面{}的参数,新建后将以默认设置生效。
 *
 *3、删除cookie,即把对应cookie值置为null,代码如下:
 * $.cookie(‘userid‘, null);
 *
 *4、读取cookie,如读取变量名为userid的cookie值,代码如下:
 * var uId= $.cookie(‘userid‘);
 *
 */

/**
 * 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;
    }
};

 

var cookie_f_city= $.cookie(‘f_city‘); //读取cookie只有一种写法,不接受{domain}参数,也就是说,当有域同名参数时,只读创建最早的 f_city

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