自己写的jQuery 左右选择框，大家多多指教！
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
<script type="text/javascript" src="http://code.jquery.com/jquery-1.4.2.min.js"></script>
<style>
.sel{width:150px;height:200px;}
.btn{width:50px;font-weight:bold;font-size:14px; }
</style>
</HEAD>
<BODY>
<table>
<tr>
<td>
<select multiple class="sel" id="sel_left">
<option value="a">aaaaaaaaaaa</option>
<option value="b">bbbbbbbbbbb</option>
<option value="c">ccccccccccc</option>
<option value="d">ddddddddddd</option>
<option value="e">eeeeeeeeeee</option>
</select>
</td>
<td>
<p><button class="btn" id="btn_1">>> </button></p>
<p><button class="btn" id="btn_2">></button></p>
<p><button class="btn" id="btn_3"><</button></p>
<p><button class="btn" id="btn_4"><<</button></p>
</td>
<td>
<select multiple class="sel" id="sel_right">
<option value="f">fffffffffff</option>
</select>
</td>
</tr>
</table>
</BODY>
<script>
$(function(){
$("#sel_left,#sel_right").bind("change",checkBtn);
$("#btn_1,#btn_2,#btn_3,#btn_4").bind("click",clickBtn);
checkBtn();
});
function checkBtn(){
jQuery("#sel_left>option").length > 0 ? jQuery("#btn_1").removeAttr("disabled") : jQuery("#btn_1").attr("disabled","disabled");
jQuery("#sel_left option:selected").length > 0 ? jQuery("#btn_2").removeAttr("disabled") : jQuery("#btn_2").attr("disabled","disabled");
jQuery("#sel_right option:selected").length > 0 ? jQuery("#btn_3").removeAttr("disabled") : jQuery("#btn_3").attr("disabled","disabled");
jQuery("#sel_right>option").length > 0 ? jQuery("#btn_4").removeAttr("disabled") : jQuery("#btn_4").attr("disabled","disabled");
}
function clickBtn(e){
if("btn_1" == e.target.id){
jQuery("#sel_left>option").appendTo("#sel_right");
}else if("btn_2" == e.target.id){
jQuery("#sel_left option:selected").appendTo("#sel_right");
}else if("btn_3" == e.target.id){
jQuery("#sel_right option:selected").appendTo("#sel_left");
}else if("btn_4" == e.target.id){
jQuery("#sel_right>option").appendTo("#sel_left");
}
checkBtn();
}
</script>
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