App下載
實例代碼( Tip: 登錄后體驗更佳 )
<!DOCTYPE html>
<html>
<head>
<script>
function getIndex()
{
var x=document.getElementById("mySelect");
alert(x.selectedIndex);
}
</script>
</head>
<body>
<form>
你喜欢的水果是：
<select id="mySelect">
  <option>Apple</option>
  <option>Orange</option>
  <option>Pineapple</option>
  <option>Banana</option>
</select>
<br><br>
<input type="button" onclick="getIndex()" value="弹出选中项">
</form>
</body>
</html>
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運行結(jié)果