关于 sinatra：onclick 时更改 ERB 文件中 Ruby 变量的值

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    <!-- Get ERB to work here -->
    <p>No account?">Register here</p> <!-- Should change new_user to true if clicked -->
    <form method="POST" action="/nanotwitter/v1.0/users/session">
        <input type="text" name="username" placeholder="Username">
     
        <input type="password" name="password" placeholder="Password">
      <% if new_user %>
       
        <input type="password" name="password2" placeholder="Repeat password">
      <% end %>
     
     
        <button type="button">Close</button>
        <button type="submit">
          <% if new_user %>
          Register
          <% else %>
          Log In
          <% end %>
        </button>
     
      </form>