//创建cookie

function setCookie(name, value, expires, path, domain, secure) {

    var cookieText = encodeURIComponent(name) + '=' + encodeURIComponent(value);

    if (expires instanceof Date) {

        cookieText += '; expires=' + expires;

    }

    if (path) {

        cookieText += '; expires=' + expires;

    }

    if (domain) {

        cookieText += '; domain=' + domain;

    }

    if (secure) {

        cookieText += '; secure';

    }

    document.cookie = cookieText;

}

//获取cookie

function getCookie(name) {

    var cookieName = encodeURIComponent(name) + '=';

    var cookieStart = document.cookie.indexOf(cookieName);

    var cookieValue = null;

    if (cookieStart > -1) {

        var cookieEnd = document.cookie.indexOf(';', cookieStart);

        if (cookieEnd == -1) {

            cookieEnd = document.cookie.length;

        }

        cookieValue = decodeURIComponent(document.cookie.substring(cookieStart + cookieName.length, cookieEnd));

    }

    return cookieValue;

}

//删除cookie

function unsetCookie(name) {

    document.cookie = name + "= ; expires=" + new Date(0);

}