对select下拉中元素的操作：增、删、清空
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<script src="https://cdn.bootcdn.net/ajax/libs/jquery/2.2.0/jquery.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
function add() {
$("#sele").append("<option value='sz1005'>新增1005</option>");
}
function remo() {
$("#sele option[value='sj1002']").remove();
$("#sele option[value='sj1003']").remove();
}
function seleremo() {
$("select option:selected").remove();
}
function clearEmpty() {
$("#sele").empty();
}
</script>
</head>
<body>
<pre>
jQuery 对下拉框的操作，增删节点，删除指定节点，清空
</pre>
<select name="" id="sele" size="7">
<option value="sj1001">数据1001</option>
<option value="sj1002">数据1002</option>
<option value="sj1003">数据1003</option>
</select>
<br />
<input type="button" onclick="add()" value="添加节点" /><br />
<input type="button" onclick="remo()" value="移除节点" /><br />
<input type="button" onclick="seleremo()" value="选中移除" /><br />
<input type="button" onclick="clearEmpty()" value="清空" /><br />
</body>
</html>