<select id="s1" name="s1" onchange=chk()>
<option>1
<option>2
<option>3
<option>4
</select>
<select id="s1" name="s2" onchange=chk()>
<option>1
<option>2
<option>3
<option>4
</select>
<select id="s1" name="s3" onchange=chk()>
<option>1
<option>2
<option>3
<option>4
</select>
<select id="s1" name="s4" onchange=chk()>
<option>1
<option>2
<option>3
<option>4
</select>
<script>
function chk(){
var s = document.getElementById("s1");
for(i=0;i<s.length;i++){
alert('页面上有select控件'+'s['+i+']');
}
}
</script>
<option>1
<option>2
<option>3
<option>4
</select>
<select id="s1" name="s2" onchange=chk()>
<option>1
<option>2
<option>3
<option>4
</select>
<select id="s1" name="s3" onchange=chk()>
<option>1
<option>2
<option>3
<option>4
</select>
<select id="s1" name="s4" onchange=chk()>
<option>1
<option>2
<option>3
<option>4
</select>
<script>
function chk(){
var s = document.getElementById("s1");
for(i=0;i<s.length;i++){
alert('页面上有select控件'+'s['+i+']');
}
}
</script>
<select name="sel" onchange="change(this)">...</select>
<select name="sel" onchange="change(this)">...</select>
<script>
function change(obj) { alert(obj.value); }
</script>2、通过onchange执行的函数传参
<select name="sel" onchange="change(0)">...</select>
<select name="sel" onchange="change(1)">...</select>
<script>
function change(index) { alert(sel[index].value); }
</script>3、使用select的其他属性来标识
<select name="sel" onchange="change(this)" title="sel1">...</select>
<select name="sel" onchange="change(this)" title="sel2">...</select>
<script>
function change(obj) { alert(obj.title); }
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
<META NAME="Generator" CONTENT="EditPlus">
<META NAME="Author" CONTENT="">
<META NAME="Keywords" CONTENT="">
<META NAME="Description" CONTENT="">
</HEAD>
<script language='javascript'>
function select_click(obj)
{
alert(obj.length)
}
</script>
<BODY>
<select name="s1" onchange="select_click(this)">
<option value=1>1</option>
<option value=2>2</option>
</select>
<select name="s1" onchange="select_click(this)">
<option value=1>1</option>
<option value=2>2</option>
<option value=3>3</option>
</select>
</BODY>
</HTML>