【select】
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
function fun(e) {
document.getElementById('caption').innerHTML = e.options[e.selectedIndex].text
}
</script>
</head>
<body>
<select onchange=fun(this)>
<option id="apple">Apple</option>
<option id="orange">Orange</option>
<option id="pineapple">Pineapple</option>
<option id="banana">Banana</option>
</select>
<p id="caption"></p>
</body>
</html>
