jquery插件操作Cookie的插件使用方法

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;
    }
};

jQuery操作cookie的插件,大概的使用方法如下
$.cookie('the_cookie'); 
//读取Cookie值
$.cookie('the_cookie', 'the_value');
 //设置cookie的值
$.cookie('the_cookie', 'the_value', 
{expires: 7, path: '/', domain: 'jquery.com', secure: true});
//新建一个cookie 包括有效期 路径 域名等
$.cookie('the_cookie', 'the_value'); 
//新建cookie
$.cookie('the_cookie', null);
 //删除一个cookie