下面的例子把密码域设置为只读 - 在线编辑器

          <!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>蜜蜂教程(mifengjc.com)</title>
  <script>
    function setResult() {
      document.getElementById("pwd").readOnly = true;
    }
  </script>
</head>
<body>

  <form>
    密码: <input type="password" id="pwd">
  </form>
  <button type="button" onclick="setResult()">设置只读</button>

</body>
</html>
        