【select】
<!DOCTYPE html>
<html>
<body>
<select id="My_Select_Menu">
<option value="Blue" selected="selected">blue</option>
</select>
<script type='text/javascript'>
var sel = document.getElementById("My_Select_Menu");
if (sel.options[sel.selectedIndex].value == "Blue") {
console.log("hahaha");
}
</script>
</body>
</html>
