这个用select不能实现,只能用div模拟
<script>
function showdiv(w)
{
str="<table style='border:1 solid #000000;' width="+w+" cellspacing=0 cellpadding=0>";
for(i=0;i<document.all.mysel.options.length;i++)
str+="<tr><td style='font-size:10pt' onmouseover=myover() onmouseout=myout() onmousedown=myclick("+i+")>"+document.all.mysel.options[i].text+"</td></tr>";
likesel.innerHTML=str+"</table>";
likesel.style.display="block";
}
function myover()
{
event.srcElement.style.cursor="default";
event.srcElement.style.color="white";
event.srcElement.style.background="darkblue";
}
function myout()
{
event.srcElement.style.color="";
event.srcElement.style.background="";
}
function myclick(j)
{
document.all.mysel.selectedIndex=j;
likesel.style.display="none";
}
</script>
<body>
<select name=mysel onclick="likesel.style.display='none'" onfocus=showdiv(mysel.offsetWidth) onblur="document.all.likesel.style.display='none'">
<option value=11>1111111
<option value=12>111112
<option value=13>1111111113
</select><input><input>
<div id=likesel><div>
<script>
function showdiv(w)
{
str="<table style='border:1 solid #000000;' width="+w+" cellspacing=0 cellpadding=0>";
for(i=0;i<document.all.mysel.options.length;i++)
str+="<tr><td style='font-size:10pt' onmouseover=myover() onmouseout=myout() onmousedown=myclick("+i+")>"+document.all.mysel.options[i].text+"</td></tr>";
likesel.innerHTML=str+"</table>";
likesel.style.display="block";
}
function myover()
{
event.srcElement.style.cursor="default";
event.srcElement.style.color="white";
event.srcElement.style.background="darkblue";
}
function myout()
{
event.srcElement.style.color="";
event.srcElement.style.background="";
}
function myclick(j)
{
document.all.mysel.selectedIndex=j;
likesel.style.display="none";
}
</script>
<body>
<select name=mysel onclick="likesel.style.display='none'" onfocus=showdiv(mysel.offsetWidth) onblur="document.all.likesel.style.display='none'">
<option value=11>1111111
<option value=12>111112
<option value=13>1111111113
</select><input><input>
<div id=likesel><div>
<script>
function showdiv(w)
{
str="<table style='border:1 solid #000000;' width="+w+" cellspacing=0 cellpadding=0>";
for(i=0;i<document.all.mysel.options.length;i++)
str+="<tr><td style='font-size:10pt' onmouseover=myover() onmouseout=myout() onmousedown=myclick("+i+")>"+document.all.mysel.options[i].text+"</td></tr>";
likesel.innerHTML=str+"</table>";
likesel.style.display="block";
}
function myover()
{
event.srcElement.style.cursor="default";
event.srcElement.style.color="white";
event.srcElement.style.background="darkblue";
}
function myout()
{
event.srcElement.style.color="";
event.srcElement.style.background="";
}
function myclick(j)
{
document.all.mysel.selectedIndex=j;
likesel.style.display="none";
}
</script>
<body>
<select name=mysel onclick="likesel.style.display='none'" onfocus=showdiv(mysel.offsetWidth) onblur="document.all.likesel.style.display='none'">
<option value=11>1111111
<option value=12>111112
<option value=13>1111111113
</select><input><input>
<div id=likesel><div>
<script LANGUAGE="javascript">
<!-- function change(){
form1.mysel.Click();}-->
</script>
</head>
<body>
<form name="form1" method="post">
<input type="text"><br>
<select name="mysel" onFocus="change()">
<option value="1">夺</option>
<option value="2">取</option>
</select>
</form>
</body>
那你可能只好用层了
<input type="text"><br>
<DIV id=mnuoil style="visibility: hidden; width: 100; position: absolute; left: 15; top: 60; height: 48">
<TABLE style="FONT-SIZE: 12px" cellSpacing=0 cellPadding=0 width="100"
bgColor=lightblue border=0>
<TBODY>
<TR><TD height=24>选项1</TD></TR>
<TR><TD height=24>选项2</TD></TR>
</TBODY></TABLE>
</div>
<select name="df" onFocus='showdiv("mnuoil")' onblur='hidediv("mnuoil")'>
<option value="1">夺</option>
<option value="2">取</option>
</select><SCRIPT LANGUAGE=javascript>
function showdiv() {
var a, arg=showdiv.arguments;
a=document.all[arg[0]];
a.style.visibility='visible';
}
function hidediv() {
var a, arg=hidediv.arguments;
a=document.all[arg[0]];
a.style.visibility='hidden';
}
</SCRIPT>