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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <style> ul{margin:0;padding:0;} li{list-style:none;} .box{width: 500px; margin: auto; border: 1px solid red; overflow: hidden;line-height: 30px; height: 30px; position:relative;} .box ul li{float:left;display:inline; vertical-align:top;height:30px;line-height:30px;padding:0 5px;} .box ul {position: absolute;} .box span{float:left;height:100%;line-height:30px;font-size:16px;background:#ccc;width:30px;text-align:center;} .menu{float:left; width:440px;overflow:hidden; height:30px; position:relative;} </style> <script> window.onload=function(){ var oBox=document.getElementById('box'); var aSpan=oBox.getElementsByTagName('span'); var oMenu=oBox.getElementsByTagName('div')[0]; var oUl=oMenu.getElementsByTagName('ul')[0]; var aLi=oUl.getElementsByTagName('li'); var iW=0; for(var i=0;i<aLi.length;i++) { iW+=aLi[i].offsetWidth; } oUl.style.width=iW+'px'; aSpan[0].onclick=function() { var iLeft=oUl.offsetLeft+10; iLeft>=0&&(iLeft=0); oUl.style.left=iLeft+'px'; } aSpan[1].onclick=function() { var iLeft=oUl.offsetLeft-10; var maxLeft=oMenu.offsetWidth-oUl.offsetWidth; iLeft<=maxLeft&&(iLeft=maxLeft); oUl.style.left=iLeft+'px'; } } </script> <body> <div class="box" id="box"> <span class="prev"><</span> <div class="menu"> <ul> <li>1111111111111111111</li> <li>22222222222222</li> <li>33333333333333333333</li> <li>444444444</li> <li>55555</li> <li>6666</li> <li>777</li> </ul> </div> <span class="next">></span> </div> </body></html>