设置按钮的顶部位置 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <style type="text/css">
    #b1 {
      position: absolute;
    }
  </style>
  <script>
    function displayResult() {
      document.getElementById("b1").style.top = "100px";
    }
  </script>
</head>
<body>

  <input type="button" id="b1" onclick="displayResult()" value="设置顶部位置为100 px">

</body>
</html>
        