在Ajax响应后重新触发CSS 3动画时出现了问题

Here is an HTML form

这是一个HTML表单

<form method="post" action="camount.php" id="loginForm">
  <span id="heading">
    Username: <input type="text" name='us' id='us'/><br />
    Password: <input type="password" name='pa' id='pa'/><br />
  </span>
  <input type="button" value="Sign in" onclick="isPasswordCorrect(document.getElementById('us'), document.getElementById('pa'))" /><br />
  <span class="animated shake" id="report"></span>
</form>
<form metho