html input 展示隐藏的密码

<!DOCTYPE html>
<html>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<body>

<h2>登录表格</h2>

<form action="/action_page.php">
  <div class="container">
    <label for="uname"><b>用户名</b></label>
    <input type="text" placeholder="输入用户名" name="uname" required>

    <label for="psw"><b>密码</b></label>
    <input type="password" placeholder="输入密码" name="psw" required>

    <button type="submit">登录</button>
  </div>
</form>

</body>
</html>