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首页 / 脚本样式 / JavaScript / jquery.cookie.js的介绍与使用方法

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
  1. 同个网站中所有的页面共享一套 cookie
  2. cookie 有数量、大小限制
  3. cookie 有过期时间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。
使用方法:

设置 cookie:
$.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);
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 cookieoptions = 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 cookievar 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
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作能带来一定的帮助,如果有疑问大家可以留言交流。