不同时间显示不同的广告代码

<script type="text/javascript">var h = new Date().getHours();var t = "";if(h >= 7 && h <= 13){t = "<div class='inde_t_ad'><a href='http://www.daixiao360.cn/' target='_blank' rel='nofollow'>
</a></div>";        }else if(h >= 14 && h <= 20){t = "广告2";}else if(h >= 21 || h <= 6){ t = "广告3";}document.getElementById('time_ads').innerHTML = t;</script>