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jquery.cookie.js下载

卢嘉誉
2023-12-01

Cookies

定义:让网站服务器把少量数据储存到客户端的硬盘或内存,从客户端的硬盘读取数据的一种技术;

下载与引入:jquery.cookie.js基于jquery;先引入jquery,再引入:jquery.cookie.js;下载:http://plugins.jquery.com/cookie/

 
  1. <script type="text/javascript" src="js/jquery.min.js"></script>

  2. <script type="text/javascript" src="js/jquery.cookie.js"></script>

使用:

1.添加一个"会话cookie"

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

这里没有指明 cookie有效时间,所创建的cookie有效期默认到用户关闭浏览器为止,所以被称为 “会话cookie(session cookie)”。

2.创建一个cookie并设置有效时间为 7天

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

这里指明了cookie有效时间,所创建的cookie被称为“持久 cookie (persistent cookie)”。注意单位是:天;

3.创建一个cookie并设置 cookie的有效路径

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

在默认情况下,只有设置 cookie的网页才能读取该 cookie。如果想让一个页面读取另一个页面设置的cookie,必须设置cookie的路径。cookie的路径用于设置能够读取 cookie的顶级目录。将这个路径设置为网站的根目录,可以让所有网页都能互相读取 cookie (一般不要这样设置,防止出现冲突)。

4.读取cookie

$.cookie('the_cookie');

5.删除cookie

$.cookie('the_cookie', null);   //通过传递null作为cookie的值即可

6.可选参数

 
  1. $.cookie('the_cookie','the_value',{

  2. expires:7,

  3. path:'/',

  4. domain:'jquery.com',

  5. secure:true

  6. })

expires:(Number|Date)有效期;设置一个整数时,单位是天;也可以设置一个日期对象作为Cookie的过期日期;
path:(String)创建该Cookie的页面路径;
domain:(String)创建该Cookie的页面域名;
secure:(Booblean)如果设为true,那么此Cookie的传输会要求一个安全协议,例如:HTTPS;

 

插件代码

/*!
 * jQuery Cookie Plugin v1.4.1
 * https://github.com/carhartl/jquery-cookie
 *
 * Copyright 2013 Klaus Hartl
 * Released under the MIT license
 */
(function (factory) {
	if (typeof define === 'function' && define.amd) {
		// AMD
		define(['jquery'], factory);
	} else if (typeof exports === 'object') {
		// CommonJS
		factory(require('jquery'));
	} else {
		// Browser globals
		factory(jQuery);
	}
}(function ($) {

	var pluses = /\+/g;

	function encode(s) {
		return config.raw ? s : encodeURIComponent(s);
	}

	function decode(s) {
		return config.raw ? s : decodeURIComponent(s);
	}

	function stringifyCookieValue(value) {
		return encode(config.json ? JSON.stringify(value) : String(value));
	}

	function parseCookieValue(s) {
		if (s.indexOf('"') === 0) {
			// This is a quoted cookie as according to RFC2068, unescape...
			s = s.slice(1, -1).replace(/\\"/g, '"').replace(/\\\\/g, '\\');
		}

		try {
			// Replace server-side written pluses with spaces.
			// If we can't decode the cookie, ignore it, it's unusable.
			// If we can't parse the cookie, ignore it, it's unusable.
			s = decodeURIComponent(s.replace(pluses, ' '));
			return config.json ? JSON.parse(s) : s;
		} catch(e) {}
	}

	function read(s, converter) {
		var value = config.raw ? s : parseCookieValue(s);
		return $.isFunction(converter) ? converter(value) : value;
	}

	var config = $.cookie = function (key, value, options) {

		// Write

		if (value !== undefined && !$.isFunction(value)) {
			options = $.extend({}, config.defaults, options);

			if (typeof options.expires === 'number') {
				var days = options.expires, t = options.expires = new Date();
				t.setTime(+t + days * 864e+5);
			}

			return (document.cookie = [
				encode(key), '=', stringifyCookieValue(value),
				options.expires ? '; expires=' + options.expires.toUTCString() : '', // use expires attribute, max-age is not supported by IE
				options.path    ? '; path=' + options.path : '',
				options.domain  ? '; domain=' + options.domain : '',
				options.secure  ? '; secure' : ''
			].join(''));
		}

		// Read

		var result = key ? undefined : {};

		// To prevent the for loop in the first place assign an empty array
		// in case there are no cookies at all. Also prevents odd result when
		// calling $.cookie().
		var cookies = document.cookie ? document.cookie.split('; ') : [];

		for (var i = 0, l = cookies.length; i < l; i++) {
			var parts = cookies[i].split('=');
			var name = decode(parts.shift());
			var cookie = parts.join('=');

			if (key && key === name) {
				// If second argument (value) is a function it's a converter...
				result = read(cookie, value);
				break;
			}

			// Prevent storing a cookie that we couldn't decode.
			if (!key && (cookie = read(cookie)) !== undefined) {
				result[name] = cookie;
			}
		}

		return result;
	};

	config.defaults = {};

	$.removeCookie = function (key, options) {
		if ($.cookie(key) === undefined) {
			return false;
		}

		// Must not alter options, thus extending a fresh object...
		$.cookie(key, '', $.extend({}, options, { expires: -1 }));
		return !$.cookie(key);
	};

}));
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