<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="../../js/jquery-3.3.1.min.js"></script>
<style>
#leftName , #btn,#rightName{
float: left;
width: 100px;
height: 300px;
}
#toRight,#toLeft{
margin-top:100px ;
margin-left:30px;
width: 50px;
}
.border{
height: 500px;
padding: 100px;
}
</style>
<script>
$(function () {
//需求：实现下拉列表选择条目左右选择功能
$("#toRight").click(function () {
$("#leftName>option:checked").appendTo($("#rightName"));
});
$("#toLeft").click(function () {
$("#rightName>option:checked").appendTo($("#leftName"));
});
});
</script>
</head>
<body>
<div class="border">
<select id="leftName" multiple="multiple">
<option>张三</option>
<option>李四</option>
<option>王五</option>
<option>赵六</option>
</select>
<div id="btn">
<input type="button" id="toRight" value="-->"><br>
<input type="button" id="toLeft" value="<--">
</div>
<select id="rightName" multiple="multiple">
<option>钱七</option>
</select>
</div>
</body>
</html>
原文：https://www.cnblogs.com/newcityboy/p/11520905.html