JavaScript 实现自动切换 Tab 选项卡：避免同步切换的美观优化

<title>自动切换Tab选项卡</title>  <style> .tab { font-family: Verdana, Helvetica, Arial; font-size: 12px; position: relative; width: 100%; } .tab-border {border:1px solid;border-color: rgb(120,172,255);} .tab-head { background-color:rgb(234,242,255);; border:0px; height:23px; line-height:20px; position:relative; } .tab-head ul{ border:0px; height:23px; list-style:none; margin:0px; text-align:center; padding:0; position:absolute; } .tab-head li{ border: 1px solid; border-color: rgb(120,172,255); border-left: 0; border-bottom: 0; border-top: 0; cursor:pointer; color:#416AA3; float:left; display:block; height:22px;!important;height:20px; line-height:20px; padding: 2px 6px 0px 6px; margin-top: 2px; margin-right: -1px; text-overflow:ellipsis; white-space:nowrap; overflow:hidden; } .tab-head li.hover{ border: 1px solid rgb(120,172,255); border-bottom: 0; padding: 0px 6px 3px 6px; margin: 0px 1px 0px 0px; background: white; font-size: 13px; font-weight: bold; color: rgb(0,66,174); overflow:visible; } </style> <div id="rptopmain_right_middle_right">             <!--公告、面板-->                     <div id="divForumBoard"></div>                                             <div id="divForumCast" style="padding:8px;height:200px"> <DIV class=rp_2equalcol>黑客零起点教程 CHM</DIV> <DIV class=rp_2equalcol>可以加密及解密的VB屏幕键盘组件</DIV> <DIV class=rp_2equalcol>什么样的项目经历会让面试官眼前一亮</DIV> <DIV class=rp_2equalcol>超级j2me飞行游戏疯狂雷电源代码</DIV> <DIV class=rp_2equalcol>可以加密及解密的VB屏幕键盘组件</DIV> <DIV class=rp_2equalcol>编程学习中的一些错误认识</DIV>                     </div>                                     <div id="divForumPanel" style="padding:8px;height:210px">                                 <DIV class=rp_2equalcol>Delphi多文档几何图形绘制及编辑程序</DIV> <DIV class=rp_2equalcol>学ACM算法题有用吗？</DIV> <DIV class=rp_2equalcol>黑客零起点教程 CHM</DIV> <DIV class=rp_2equalcol>超级j2me飞行游戏疯狂雷电源代码</DIV> <DIV class=rp_2equalcol>B实现主窗体控制副窗口的显示与隐藏</DIV> <DIV class=rp_2equalcol>Delphi多文档几何图形绘制及编辑程序</DIV>                             </div>                                                                         </div>         </div> 

[Ctrl+A 全选 注:引入外部Js需再刷新一下页面才能执行]