要完成此效果有三个步骤 第一步：把如下代码加入到<head>区域中 <SCRIPT LANGUAGE="JavaScript"> <!-- begin // please help yourself to this code. var startTime =null; var timerID =null; var initial =new Date(); var pos =0; var menuItem =null; function initArray() { this.length = initArray.arguments.length for (var i = 0; i < this.length; i++) { this[i+1] = initArray.arguments[i] } } function parsemenuItem(data,num) { for(var i=0;i<data.length;i++) { if(data.substring(i,i+1)=="|") break; } if (num==0) return(data.substring(0,i)); else return(data.substring(i+1,data.length)); } function startTimer() { initial = new Date(); startTime=initial.getTime(); stopTimer(); menuItem = new initArray("Netscape|http://www.netscape.com", "Microsoft|http://www.microsoft.com", "IBM|http://www.ibm.com", "Yahoo|http://www.yahoo.com", "Excite|http://www.excite.com", "Hotbot|http://www.hotbot.com", "Typhoon Start|http://typhoon.500.to", "Email|mailto:jojoo@jojoo.net" ); showTimer(); } function stopTimer() { timerID=null; menuItem=null; //clearTimeout(timerID); } function showTimer() { pos= (pos == menuItem.length) ? 1 : pos + 1; document.forms[0].elements[0].value=parsemenuItem(menuItem[pos],0); timerID=window.setTimeout('showTimer()',4000); } function goToUrl() { //parent.welcome.location=parsemenuItem(menuItem[pos],1); this.location=parsemenuItem(menuItem[pos],1); return (false); } // end --> </SCRIPT> 第二步：把如下代码加入到<body>区域中 <FORM> <div align="center"> <INPUT TYPE="button" VALUE=" WHERE TO? " NAME="goTo" onClick="window.goToUrl()"> </div> </FORM> 第三步：把“onLoad="window.startTimer()"”加在<body>标记里 例如：<body onLoad="window.startTimer()">