![](https://images2017.cnblogs.com/blog/1235196/201710/1235196-20171027165303633-568313192.png)
*{
margin:0px auto;
padding:0px;
}
/*#date{
width:200px;
height:20px;
}*/
#wai{
width:500px;
height:500px;
}
#zuo{
float:left;
width:200px;
height:500px;
}
#zhong{
float:left;
width:100px;
height:500px;
}
#you{
float:left;
width:200px;
height:500px;
}
</style>
</head>
<body>
<!--<div id="date"></div>-->
<div id="wai">
<div id="zuo">
<select multiple="multiple" id="znr" style="width:200px; height:200px;">
<option value="山东">山东</option>
<option value="淄博">淄博</option>
<option value="张店">张店</option>
</select>
</div>
<div id="zhong">
<div style="margin-left:25px; margin-top:20px;"><input type="button" value=">>" style="width:50px;" onclick="Moveall()" /></div>
<div style="margin-left:25px; margin-top:20px;"><input type="button" value=">" style="width:50px;" onclick="Moveone()"/></div>
</div>
<div id="you">
<select id="ynr" multiple="multiple" style="width:200px; height:200px;">
</select>
</div>
</div>
</body>
<script type="text/javascript">
/*window.setInterval("Time()",1);
function Time()
{
var date = new Date();
var n = date.getFullYear();
var y = date.getMonth()+1;
var r = date.getDate();
var x = date.getHours();
var f = date.getMinutes();
var m = date.getSeconds();
var h = date.getMilliseconds() //获取毫秒
var str = "当前时间:"+n+"年"+y+"月"+r+"日"+x+":"+f+":"+m+":"+h;
document.getElementById("date").innerHTML = str;
//document.all.date.innerHTML = str;
}*/
//Moveone();
function Moveone()
{
var left = document.getElementById("znr");
var right = document.getElementById("ynr");
var lz = left.value;
var str;
str ="<option value='"+lz+"'>"+lz+"</option>";
var bs=0;
/*if(right.value==left.value)
{
bs=1;
alert("jjjjj");
}
if(bs==0)
{
right.innerHTML = right.innerHTML+str;
}*/
for(var i=0;i<right.childNodes.length;i++)
{
if(right.childNodes.item(i).text == lz)
{
bs = 1;
}
}
if(bs==0)
{
right.innerHTML = right.innerHTML+str;
}
//right = document.write(str);
}
function Moveall()
{
var left = document.getElementById("znr");
var right = document.getElementById("ynr");
right.innerHTML = left.innerHTML;
}
</script>
![](https://images2017.cnblogs.com/blog/1235196/201710/1235196-20171027165352055-1034524791.png)