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js /jquery 获取cookie值代码
*/

function getcookie(name, dc){  
    var cname = name + "=";
    if (dc.length > 0){  
        var begin = dc.indexof(cname);
        if (begin != -1){  
            begin += cname.length;  
            end = dc.indexof(",", begin);  
            if (end == -1){  
                end = dc.length;  
            }  
            return dc.substring(begin, end);  
        }  
    }  
    return null;  
}

//jquery取值比较简单，因为他有个自带函数

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
        }
        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;
    }
};

//使用方法

$.cookie("the_cookie", "the_value", { expires: 7, path: "/", domain: "111cn.net", secure: true });

本文来源：http://www.gdgbn.com/wangyezhizuo/29780/