显示已选择的选项 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function displayResult() {
      var x = document.getElementById("mySelect").selectedIndex;
      alert(document.getElementsByTagName("option")[x].value);
    }
  </script>
</head>
<body>

  <form>
    选择你最喜欢的水果:
    <select id="mySelect">
  <option value="apple">Apple</option>
  <option value="orange">Orange</option>
  <option value="pineapple">Pineapple</option>
  <option value="banana">Banana</option>
</select>
  </form>
  <button type="button" onclick="displayResult()">选择的水果的值。</button>

</body>
</html>
        