Select multiple多选上移、下移

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<TITLE> Select Demo </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<style>
    center
    {
        font-size:12px;
        color:red;
        font-weight:bold;
    }
    select
    {
        font-size:12px;
        color:green;
    }
</style>

<BODY>
    <span id='feedback'></span>
    
    <form method="post" name="myform">
  <table border="0" width="400">
 <tr>
  <td><CENTER>可选择排序方式</CENTER></td>
  <td> </td>
  <td><CENTER>已选择排序方式</CENTER></td>
 </tr>
    <tr>
      <td width="40%">
  <select  multiple name="left" id="left" size="8" style='200;'
  ondblclick="moveOption(document.getElementById('left'), document.getElementById('right'))">
       <option value="20">测试数据一</option>
       <option value="30">测试数据二</option>
       <option value="40">测试数据三</option>
       <option value="50">测试数据四</option>
       <option value="60">测试数据五</option>
       <option value="70">测试数据六</option>  
       <option value="80">测试数据七</option>
       <option value="90">测试数据八</option>  

  </select>
   </td>
      <td width="20%" align="center">
  <input type="button" value=" >> " οnclick="moveOption(document.getElementById('left'),document.getElementById('right'))"><br><br>
  <input type="button" value=" << " οnclick="dropOption(document.getElementById('right'))">
   </td>
      <td width="40%">
  <select  multiple name="right" id="right" size="8" style='200;'
  ondblclick="dropOption(document.getElementById('right'))">
  </select>
   </td>
    </tr>
<tr>
<td colspan="3"><CENTER>
    <INPUT TYPE="button" value="置顶" οnclick="moveTop(document.getElementById('right'));">
    <INPUT TYPE="button" value="上移" οnclick="moveUp(document.getElementById('right'));">
    <INPUT TYPE="button" value="下移" οnclick="moveDown(document.getElementById('right'));">
    <INPUT TYPE="button" value="置底" οnclick="moveBottom(document.getElementById('right'));">
</CENTER></td>
</tr>
  </table>
    
 
</BODY>
</HTML>


<SCRIPT LANGUAGE="JavaScript">
<!--
    //上移
    function moveUp(obj){
        for(var i=1; i < obj.options.length; i++){//最上面的一个不需要移动，所以直接从i=1开始
            if(obj.options[i].selected){
                if(!obj.options.item(i-1).selected){
                    var selText = obj.options[i].text;
                    var selValue = obj.options[i].value;
                    obj.options[i].text = obj.options[i-1].text;
                    obj.options[i].value = obj.options[i-1].value;
                    obj.options[i].selected = false;
                    obj.options[i-1].text = selText;
                    obj.options[i-1].value = selValue;
                    obj.options[i-1].selected=true;
                }
            }
        }
    }
    
    //下移
    function moveDown(obj){
        for(var i = obj.options.length -2 ; i >= 0; i--){//向下移动，最后一个不需要处理，所以直接从倒数第二个开始
            if(obj.options[i].selected){
                if(!obj.options[i+1].selected){
                    var selText = obj.options[i].text;
                    var selValue = obj.options[i].value;
                    obj.options[i].text = obj.options[i+1].text;
                    obj.options[i].value = obj.options[i+1].value;
                    obj.options[i].selected = false;
                    obj.options[i+1].text = selText;
                    obj.options[i+1].value = selValue;
                    obj.options[i+1].selected=true;
                }
            }
        }
    }
    
    //移动
    function moveOption(obj1, obj2){
        for(var i = obj1.options.length - 1 ; i >= 0 ; i--){
            if (obj2.options.length > 0){
                var exsits = false;
                for (var j = 0; j < obj2.options.length; j ++ ){
                    if (obj2.options[j].value == obj1.options[i].value){
                        exsits = true;
                        break;
                    }
                }
                if(exsits){
                    continue;
                }
            }
            if(obj1.options[i].selected){
                var opt = new Option(obj1.options[i].text,obj1.options[i].value);
                opt.selected = true;
                obj2.options.add(opt);
                //obj1.remove(i);
            }
        }
    }
    
    //删除
    function dropOption(obj){
        for(var i = obj.options.length - 1 ; i >= 0 ; i--){
            if(obj.options[i].selected){
                obj.remove(i);
            }
        }
    }
    
    //置顶
    function  moveTop(obj){ 
        var opts = []; 
        for(var i =obj.options.length -1 ; i >= 0; i--){
            if(obj.options[i].selected){
                opts.push(obj.options[i]);
                obj.remove(i);
            }
        }
        var index = 0 ;
        for(var t = opts.length-1 ; t>=0 ; t--){
            var opt = new Option(opts[t].text,opts[t].value);
            opt.selected = true;
            obj.options.add(opt, index++);
        }
    } 
    //置底
    function  moveBottom(obj){ 
        var opts = []; 
        for(var i =obj.options.length -1 ; i >= 0; i--){
            if(obj.options[i].selected){
                opts.push(obj.options[i]);
                obj.remove(i);
            }
        }
        for(var t = opts.length-1 ; t>=0 ; t--){
            var opt = new Option(opts[t].text,opts[t].value);
            opt.selected = true;
            obj.options.add(opt);
        }
    }

    //-->
</SCRIPT>
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原文地址：https://www.cnblogs.com/lxwphp/p/15454578.html