JQ 下拉框左右选择

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
* {
	margin: 0;
	padding: 0;
}
div.centent {
	float: left;
	text-align: center;
	margin: 10px;
}
span {
	display: block;
	margin: 2px 2px;
	padding: 4px 10px;
	background: #898989;
	cursor: pointer;
	font-size: 12px;
	color: white;
}
</style>
<script src="js/jquery-1.10.1.min.js" type="text/javascript"></script>
<script type="text/javascript">
$(function(){
	//移到右边
	$('#add').click(function() {
		//获取选中的选项，删除并追加给对方
		$('#select1 option:selected').appendTo('#select2');
	});
	//移到左边
	$('#remove').click(function() {
		$('#select2 option:selected').appendTo('#select1');
	});
	//全部移到右边
	$('#add_all').click(function() {
		//获取全部的选项,删除并追加给对方
		$('#select1 option').appendTo('#select2');
	});
	//全部移到左边
	$('#remove_all').click(function() {
		$('#select2 option').appendTo('#select1');
	});
	//双击选项
	$('#select1').dblclick(function(){ //绑定双击事件
		//获取全部的选项,删除并追加给对方
		$("option:selected",this).appendTo('#select2'); //追加给对方
	});
	//双击选项
	$('#select2').dblclick(function(){
		$("option:selected",this).appendTo('#select1');
	});
});
</script>
</head>
<body>
<div class="centent">
    <select multiple="multiple" id="select1" style="width:100px;height:160px;">
        <option value="1">选项1</option>
        <option value="2">选项2</option>
        <option value="3">选项3</option>
        <option value="4">选项4</option>
        <option value="5">选项5</option>
        <option value="6">选项6</option>
        <option value="7">选项7</option>
    </select>
    <div> <span id="add" >选中添加到右边&gt;&gt;</span> <span id="add_all" >全部添加到右边&gt;&gt;</span> </div>
</div>
<div class="centent">
    <select multiple="multiple" id="select2" style="width: 100px;height:160px;">
        <option value="8">选项8</option>
    </select>
    <div> <span id="remove">&lt;&lt;选中删除到左边</span> <span id="remove_all">&lt;&lt;全部删除到左边</span> </div>
</div>
</body>
</html>
效果图：
JQ 下拉框左右选择

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