<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<script type="text/javascript" src="https://cdn.bootcss.com/jquery/2.1.4/jquery.min.js" ></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.12/css/select2.min.css" />
<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.12/js/select2.min.js" ></script>
<style>
</style>
<body>
<div>
<select class="singleSelect" style="width: 200px;">
<option value="">--请选择--</option>
<option value="beijing">北京</option>
<option value="shanghai">上海</option>
<option value="henan">河南</option>
<option value="hunan">湖南</option>
<option value="hubei">湖北</option>
<option value="guangdong">广东</option>
</select>
</div>
<script type="text/javascript">
$(document).ready(function() {
$('.singleSelect').select2();
});
</script>
</body>
</html>
