左右选
<head>
<meta charset="UTF-8">
<title></title>
<style>
select {
width: 100px;
}
</style>
<script src="js/jquery-3.3.1.min.js"></script>
<script>
$(function() {
$("[value='>>']").click(function() {
var selected = $("#sel_left option:selected");
$("#sel_right").append(selected);
})
});
</script>
</head>
<body>
<select id="sel_left" multiple="multiple">
<option>A</option>
<option>B</option>
<option>C</option>
<option>D</option>
<option>E</option>
</select>
<input type="button" value=">>" />
<input type="button" value="<<" />
<select id="sel_right" multiple="multiple">
</select>
</body>
