这里有新鲜出炉的 jQuery 示例,程序狗速度看过来!
jQuery 是一个兼容多浏览器的 javascript 框架,核心理念是 write less,do more(写得更少, 做得更多)。jQuery 在 2006 年 1 月由美国人 John Resig 在纽约的 barcamp 发布,吸引了来自世界各地的众多 JavaScript 高手加入,由 Dave Methvin 率领团队进行开发。
相信大家都知道 jquery.cookie.js 是一个轻量级的 cookie 插件,可以读取、写入、删除 cookie。下面这篇文章就来给大家简单的介绍下关于 jquery.cookie.js 的介绍与使用方法,需要的朋友可以参考借鉴,一起来看看吧。
什么是 cookie?
cookie 就是页面用来保存信息,比如自动登录、记住用户名等等。
cookie 的特点
jquery.cookie.js 的用法进行详细的介绍。
使用方法:
设置 cookie:
- $.cookie('the_cookie', 'the_value');
注:如果
没有第三个参数,那么当浏览器关闭时,该 cookie 将会自动删除。
- $.cookie
设置一个有效期为 7 天的 cookie:
- $.cookie('the_cookie', 'the_value', {
- expires: 7
- });
注:
第三个参数是一个对象,除了可以设置有效期(
- $.cookie
),还可以设置有效路径(
- expires: 7
)、有效域(
- path: '/'
)及安全性(
- domain: 'jquery.com'
)。
- secure: true
读取 cookie:
- $.cookie('the_cookie');
注:如果没有该 cookie,返回 null。
删除 cookie:
- $.cookie('the_cookie', null);
我们只需要给需要删除的 cookie 设置为 null,就可以删除该 cookie。
最后附上源代码:
- /**
- * 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. 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;
- }
- };
总结
来源: http://www.phperz.com/article/17/0429/327864.html