下拉框应用

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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" />
<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.8.0.js">
</script>
<style type="text/css">
body{text-algin:center;}
#center{height:300px;line-height:300px;text-align:center;}
</style>
<script type="text/javascript">
$(function(){
$("#add").click(function(){
  $("#select1 option:selected").appendTo("#select2");
});
$("#add_all").click(function(){
  $("#select1 option").appendTo("#select2");
});
$("#select1").dblclick(function(){//选项的双击事件
  $("option:selected",this).appendTo("#select2");
})
$("#select2").dblclick(function(){
  $("option:selected",this).appendTo("#select1");
})
});
</script>
<title>下拉框应用</title>
</head>
<div class="center" style="float:left;">
<select multiple="multiple" id="select1" style="width:100px;height:160px;">
    <option value="1">option 1</option>
        <option value="2">option 2</option>
        <option value="3">option 3</option>
        <option value="4">option 4</option>
        <option value="5">option 5</option>
        <option value="6">option 6</option>
        <option value="7">option 7</option>
        <option value="8">option 8</option>

    </select>

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