jQuery的Cookie操作插件

jQuery的cookie插件

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// jQuery.cookie.js

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jQuery.cookie = function(name, value, options) {

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    if (typeof value != 'undefined') {

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        options = options || {};

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        if (value === null) {

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            value = '';

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            options = $.extend({}, options);

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            options.expires = -1;

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        }

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        var expires = '';

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        if (options.expires && (typeof options.expires == 'number'|| options.expires.toUTCString)) {

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            var date;

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            if (typeof options.expires == 'number') {

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                date = new Date();

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                date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));

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            } else {

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                date = options.expires;

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            }

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            expires = '; expires=' + date.toUTCString();

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        }

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        var path = options.path ? '; path=' + (options.path) : '';

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        var domain = options.domain ? '; domain=' + (options.domain) : '';

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        var secure = options.secure ? '; secure' : '';

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        document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');

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    } else {

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        var cookieValue = null;

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        if (document.cookie && document.cookie != '') {

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            var cookies = document.cookie.split(';');

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            for (var i = 0; i < cookies.length; i++) {

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                var cookie = jQuery.trim(cookies[i]);

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                if (cookie.substring(0, name.length + 1) == (name + '=')) {

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                    cookieValue = decodeURIComponent(cookie.substring(name.length + 1));

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                    break;

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                }

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            }

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        }

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        return cookieValue;

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    }

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};

具体用法如下：

1、设置cookie的值，比如我们要设置变量名为userid对应值为123的cookie，代码如下：

$.cookie('userid','123');

2、新建一个cookie，并设置cookie的有效期路径域名等，代码如下：

$.cookie('userid, '123', {expires: 7, path: '/', domain: 'jquery.com', secure: true});
注意：如果去掉后面{}的参数，新建后将以默认设置生效。

3、删除cookie，即把对应cookie值置为null，代码如下：

$.cookie('userid', null);

4、读取cookie，如读取变量名为userid的cookie值，代码如下：
var uId= $.cookie('userid');