下面的例子将返回按钮的表单元素类型 - 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("button1").type;
      alert(x);
    }
  </script>
</head>
<body>

  <form>
    <input type="button" onclick="displayResult()" value="显示按钮类型" id="button1">
  </form>

</body>
</html>
        