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Javascript Form - 如何获取选择下拉值所选索引

select 【select】
我们想知道如何获取选择下拉值所选索引。
代码展示 运行结果 


<html>
<head>
    <script language="JavaScript">
    function openWin(){
      var myInstance = document.myForm.mySelect;
      console.log("The selected option is located at position: ");
      console.log(myInstance.selectedIndex + "<br>");
    }
    </script>
    </head>
<body>
    <form name="myForm">My Favorite Sport is:
      <select name="mySelect">
        <option value=A>AA</option>
        <option value=B>BB</option>
        <option value=C>CC</option>
        <option value=D>DD</option>
      </select>
    <input type=BUTTON value="Click to Process" name="myButton"
             onClick="openWin()">
    </form>
</body>
</html>