jquery.cookie.js 的使用指南

转自:http://www.cnblogs.com/yjzhu/p/4359420.html

介绍:

jquery.cookie.js 是一款轻量级的 cookie 插件,可以读取,写入和删除 cookie。本文主要针对 jquery.cookie.js 的用法进行详细的介绍。

下载地址:

下载地址:http://www.oschina.net/p/cookie/

使用方法:

$.cookie('the_cookie', 'the_value');

注:如果 $.cookie 没有第三个参数,那么当浏览器关闭时,该 cookie 将会自动删除。

设置一个有效期为 7 天的 cookie:

$.cookie('the_cookie', 'the_value', {expires: 7});

注:$.cookie 第三个参数是一个对象,除了可以设置有效期(expires: 7),还可以设置有效路径(path: '/')、有效域(domain: 'jquery.com')及安全性(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);

注:我们只需要给需要删除的 cookie 设置为 null,就可以删除该 cookie。

jQuery源码:

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;
}
};
上一篇:bit,byte,char,string区别与基本类型认识


下一篇:AlgorithmsI PA2: Randomized Queues and Deques Subset