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);
    }