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Javascript Form - 如何handle选择框的更改事件

select 【select】
我们想知道如何handle选择框的更改事件。
代码展示 运行结果 


<html>
<head>
    <script language="JavaScript">
    function changeBack(form){
      for (var i = 0; i < form.mySelect.options.length; i++) {
        if (form.mySelect.options[i].selected){
          console.log("You have selected " + form.mySelect.options[i].text);
        }
      }
    }
    </script>
</head>
<body>
    <form name="myForm">
      <select name="mySelect" onChange='changeBack(this.form)'>
        <option value=A>AA</option>
        <option value=B>BB</option>
        <option value=C>CC</option>
        <option value=D>DD</option>
      </select>
    </form>
</body>
</html>