会话登录后，Jquery移动导航栏未激活（Rails）

1) This is my Login page:

1)这是我的登录页面:

<% provide(:title, 'Sign In') %>
<div data-role="page" data-url="/signin/">
    <h1>Sign In</h1>
    <%= form_for(:session, url: sessions_path) do |f| %>
<div>
    <%= f.text_field :username_or_email, placeholder: "username or email", autofocus: true %>
</div>
<div>
    <%= f.password_field :password, placeholder: "password" %>
</div>
<div>
    <%= f.submit "Sign In", rel: "external" %>
</div>
<% end %>
</div>
<% pr