JavaScript控制ComboBox中Option的增加和删除（原）
1
<html>
2<head>
3<title> Demo </title>
4<script language=javascript>
5
function deloption(){
6
var obj=document.getElementById("sel").options;
7
8
if (obj.length > 1){
9 obj.options.remove(obj.length - 1);
10
}
11
}
12
13function addoption()
14{
15 var obj=document.getElementById("sel").options;
16 var opt = new Option("newoption" + obj.length, obj.length );
17 obj.options.add(opt);
18
19}
20</script>
21</head>
22<body>
23<select name="sel">
24 <option>one
25</select>
26<input type="button" onclick="addoption()" value="ADD">
27<input type="button" onclick="deloption()" value="DEL">
28</body>
29</html>
<html>2
<head>3
<title> Demo </title>4
<script language=javascript>5
function deloption(){ 
6
var obj=document.getElementById("sel").options; 7
8
if (obj.length > 1){
9
obj.options.remove(obj.length - 1); 10
} 11
} 12
13
function addoption() 14
{15
var obj=document.getElementById("sel").options; 16
var opt = new Option("newoption" + obj.length, obj.length ); 17
obj.options.add(opt); 18
19
}20
</script>21
</head>22
<body>23
<select name="sel">24
<option>one25
</select>26
<input type="button" onclick="addoption()" value="ADD">27
<input type="button" onclick="deloption()" value="DEL">28
</body>29
</html>
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