【jquery】jquery.cookie.js 的使用指南

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：

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

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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：

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

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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：

1. $.cookie('the_cookie');

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注：如果没有该 cookie，返回 null。


删除 cookie：

1. $.cookie('the_cookie', null);

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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：

1. /**
2. * Cookie plugin
3. *
4. * Copyright (c) 2006 Klaus Hartl (stilbuero.de)
5. * Dual licensed under the MIT and GPL licenses:
6. * http://www.opensource.org/licenses/mit-license.php
7. * http://www.gnu.org/licenses/gpl.html
8. *
9. */
11. /**
12. * Create a cookie with the given name and value and other optional parameters.
13. *
14. * @example $.cookie('the_cookie', 'the_value');
15. * @desc Set the value of a cookie.
16. * @example $.cookie('the_cookie', 'the_value', { expires: 7, path: '/', domain: 'jquery.com', secure: true });
17. * @desc Create a cookie with all available options.
18. * @example $.cookie('the_cookie', 'the_value');
19. * @desc Create a session cookie.
20. * @example $.cookie('the_cookie', null);
21. * @desc Delete a cookie by passing null as value. Keep in mind that you have to use the same path and domain
22. *       used when the cookie was set.
23. *
24. * @param String name The name of the cookie.
25. * @param String value The value of the cookie.
26. * @param Object options An object literal containing key/value pairs to provide optional cookie attributes.
27. * @option Number|Date expires Either an integer specifying the expiration date from now on in days or a Date object.
28. *                             If a negative value is specified (e.g. a date in the past), the cookie will be deleted.
29. *                             If set to null or omitted, the cookie will be a session cookie and will not be retained
30. *                             when the the browser exits.
31. * @option String path The value of the path atribute of the cookie (default: path of page that created the cookie).
32. * @option String domain The value of the domain attribute of the cookie (default: domain of page that created the cookie).
33. * @option Boolean secure If true, the secure attribute of the cookie will be set and the cookie transmission will
34. *                        require a secure protocol (like HTTPS).
35. * @type undefined
36. *
37. * @name $.cookie
38. * @cat Plugins/Cookie
39. * @author Klaus Hartl/[e-mail]
40. */
42. /**
43. * Get the value of a cookie with the given name.
44. *
45. * @example $.cookie('the_cookie');
46. * @desc Get the value of a cookie.
47. *
48. * @param String name The name of the cookie.
49. * @return The value of the cookie.
50. * @type String
51. *
52. * @name $.cookie
53. * @cat Plugins/Cookie
54. * @author Klaus Hartl/[e-mail]
55. */
56. jQuery.cookie = function(name, value, options) {
57.     if (typeof value != 'undefined') { // name and value given, set cookie
58.         options = options || {};
59.         if (value === null) {
60.             value = '';
61.             options = $.extend({}, options); // clone object since it's unexpected behavior if the expired property were changed
62.             options.expires = -1;
63.         }
64.         var expires = '';
65.         if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
66.             var date;
67.             if (typeof options.expires == 'number') {
68.                 date = new Date();
69.                 date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
70.             } else {
71.                 date = options.expires;
72.             }
73.             expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
74.         }
75.         // NOTE Needed to parenthesize options.path and options.domain
76.         // in the following expressions, otherwise they evaluate to undefined
77.         // in the packed version for some reason...
78.         var path = options.path ? '; path=' + (options.path) : '';
79.         var domain = options.domain ? '; domain=' + (options.domain) : '';
80.         var secure = options.secure ? '; secure' : '';
81.         document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
82.     } else { // only name given, get cookie
83.         var cookieValue = null;
84.         if (document.cookie && document.cookie != '') {
85.             var cookies = document.cookie.split(';');
86.             for (var i = 0; i < cookies.length; i++) {
87.                 var cookie = jQuery.trim(cookies[i]);
88.                 // Does this cookie string begin with the name we want?
89.                 if (cookie.substring(0, name.length + 1) == (name + '=')) {
90.                     cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
91.                     break;
92.                 }
93.             }
94.         }
95.         return cookieValue;
96.     }
97. };

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via:http://www.cnblogs.com/yjzhu/archive/2015/03/23/4359420.html