lotus web,如何实现像CSDN首页右边的定时切换图片功能
如题！

[解决办法]
看看HTML源代码就知道了，关键部分应该是：

HTML code

<div id="ad_left" style="position:absolute;width:120px;top:184px;left:10px;display:none;"><a style="float:right;" href="#" onclick="javascript:this.parentNode.style.display='none';return false;">[关闭]</a><script type="text/javascript">    try {        var pdate = "" + parent.eval("tinfo.pdate");        if (pdate) {            pdate = new Date(pdate.replace(/-/g, "/"));            var today = new Date();            showad = (today.getTime() - pdate.getTime()) / 1000 / 60 / 60 / 24 > 30;        }    } catch (ex) { };showad=true;    try {        var ad_left = "";        if (showad && screen.availWidth >= 1280) {            ad_left += '<' + 'script type=\"text/javascript\">';            ad_left += 'google_ad_client = "pub-1076724771190722";';            ad_left += 'google_ad_slot =\"5633584852\";';            ad_left += 'google_ad_width = 120;';            ad_left += 'google_ad_height = 600;';            ad_left += '</' + 'script>';            ad_left += '<' + 'script type=\"text/javascript\"';            ad_left += 'src=\"http://pagead2.googlesyndication.com/pagead/show_ads.js\">';            ad_left += '</' + 'script>';        }        document.write(ad_left);        document.getElementById("ad_left").style.display = "";    } catch (e) { }</script></div>
[解决办法]
 showad = (today.getTime() - pdate.getTime()) / 1000 / 60 / 60 / 24 > 30;
[解决办法]
同意一楼，通过算时间差来控制