var second = document.getelementbyid('totalsecond').textcontent;

    if (navigator.appname.indexof("explorer") > -1)  //判断是ie浏览器还是firefox浏览器，采用相应措施取得秒数

    {

        second = document.getelementbyid('totalsecond').innertext;

    } else

    {

        second = document.getelementbyid('totalsecond').textcontent;

    }

    setinterval("redirect()", 1000);  //每1秒钟调用redirect()方法一次

    function redirect()

    {

        if (second < 0)

        {

            location.href = '/';

        } else

        {

            if (navigator.appname.indexof("explorer") > -1)

            {

                document.getelementbyid('totalsecond').innertext = second--;

            } else

            {

                document.getelementbyid('totalsecond').textcontent = second--;

            }

        }

    }