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var timeout = prompt("时间间隔（秒）");
var current = location.href;
if (timeout > 0) {
    setTimeout('reload()', 1000 * timeout);
}
else {
    location.replace(current);
}
function reload() {
    setTimeout('reload()', 1000 * timeout);
    var fr4me = '<frameset cols=\'*\'>\n<frame src=\'' + current + '\' />';
    fr4me += '</frameset>';

    with (document) {
        write(fr4me);
        void (close());
    };
}