<html><script type="text/javascript">
function show()
{
alert("Your car is :"+getElementById("sel").value)
}
</script>
<select id="sel" onchange="show()">
<option value ="volvo">Volvo</option>
<option value ="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select></html>
function show()
{
alert("Your car is :"+getElementById("sel").value)
}
</script>
<select id="sel" onchange="show()">
<option value ="volvo">Volvo</option>
<option value ="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select></html>
document加在哪?
function show()
{
alert("Your car is :"+document.getElementById("sel").value)
}
</script>
<select id="sel" onchange="show()">
<option value ="volvo">Volvo</option>
<option value ="saab">Saab</option>
<option value="opel">Opel</option>
<option value="audi">Audi</option>
</select></html>