jQuery.cookie = function(name, value, options) { 
    if (typeof value != 'undefined') { // name and value given, set cookie 
        options = options || {}; 
        if (value === null) { 
            value = ''; 
            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 
        } 
        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; 
    } 
}; 
function getcookie(name) { 
var cookie_start = document.cookie.indexOf(name); 
var cookie_end = document.cookie.indexOf(";", cookie_start); 
return cookie_start == -1 ? '' : unescape(document.cookie.substring(cookie_start + name.length + 1, (cookie_end > cookie_start ? cookie_end : document.cookie.length))); 
} 
function setcookie(cookieName, cookieValue, seconds, path, domain, secure) { 
    var expires = new Date(); 
    expires.setTime(expires.getTime() + seconds); 
    document.cookie = escape(cookieName) + '=' + escape(cookieValue) 
                                            + (expires ? '; expires=' + expires.toGMTString() : '') 
                                            + (path ? '; path=' + path : '/') 
                                            + (domain ? '; domain=' + domain : '') 
                                            + (secure ? '; secure' : ''); 
} 

$.cookie('the_cookie'); // 获得cookie
$.cookie('the_cookie', 'the_value'); // 设置cookie
$.cookie('the_cookie', 'the_value', { expires: 7 }); //设置带时间的cookie  7天
$.cookie('the_cookie', '', { expires: -1 }); // 删除
$.cookie('the_cookie', null); // 删除 cookie

$.cookie(’name’, ‘value’, {expires: 7, path: ‘/’, domain: ‘jquery.com’, secure: true});