JS获取Cookie值

    function GetLoginCookie() {

        var userCookie = getCookie("mycookie");

        var loginname = userCookie.split('loginname=')[1];

        loginname = unescape(loginname.split('&')[0]);

        alert(loginname);

    }

    function getCookie(name) {

        var prefix = name + "="

        var start = document.cookie.indexOf(prefix);

        if (start == -1) {

            return null;

        }

        var end = document.cookie.indexOf(";", start + prefix.length)

        if (end == -1) {

            end = document.cookie.length;

        }

        var value = document.cookie.substring(start + prefix.length, end)

        return unescape(value);

    }