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在index.html.erb中，我制作了一个按钮，当它被按下时，它会从跟随切换到取消关注，跟随切换到取消关注。
它工作得很好，但是当我按下按钮时，它会在页面加载时首先显示的按钮的右下方创建另一个新行。
为什么会这样？以及如何删除或修复这条新线？

这里有图片！

图 1. 页面加载时

页面加载时

图 2. 加载后第一次按下按钮时

第一次按下按钮时

图 3. 加载后第二次按下按钮时

第二次按下按钮时

我的代码是

follow_controller.rb

class FollowsController < ApplicationController

  def create
    @user = User.find(params[:user_id])
    current_user.follow(@user)
    respond_to do |format|
      format.js {render :action=>"create.js"}
      end
  end

  def destroy
    @user = User.find(params[:user_id])
    current_user.stop_following(@user)
    respond_to do |format|
      format.js {render :action=>"destroy.js"}
  end
end

end

意见/用户/_follow_user.html.erb

<% unless user == current_user %>
    <% if current_user.following?(user) %>
        <%= button_to("Un-Follow", user_follow_path(user.to_param, current_user.get_follow(user).id), 
        :method => :delete, 
        :remote => true, 
        :class => 'btn') %>
    <% else %>
        <%= button_to("Follow", user_follows_path(user.to_param), 
        :remote => true, 
        :class => 'btn btn-primary') %>
    <% end %>
<% end %>

意见/关注/create.js.erb

$('.follow_user[data-user-id="<%=@user.id%>"]').html('<%= escape_javascript(render :partial => "follow_user", :locals => {:user => @user}) %>');
#jQuery

意见/关注/destroy.js.erb

$('.follow_user[data-user-id="<%=@user.id%>"]').html('<%= escape_javascript(render :partial => "follow_user", :locals => {:user => @user}) %>');
#jQuery

意见/用户/index.html.erb

<%- model_class = User.new.class -%>
<div class="page-header">
  <h1><%=t '.title', :default => model_class.model_name.human.pluralize %></h1>
</div>
  <% @from %>
  <h3>tag cloud</h3>
  <% tag_cloud(@tags, %w(css1 css2 css3 css4)) do |tag, css_class| %>
    <%= link_to tag.name, {:action=>'index', :tag=>tag.name}, :class => css_class%>
  <% end %> 


<%= paginate @users %>

<table class="table table-condensed">
  <thead></thead>
    <tbody>
    <% @users.each do |user| %>  
      <div class="memberListBox">
        <div class="memberList">
            <p class="name"><span><%= user.user_profile.nickname %></span>(<%= user.user_profile.age %>)</p>
            <p class="size"><%= user.username %></p>
            <p class="img">
            <% if user.user_profile.user_avatar? %>
            <%= image_tag(user.user_profile.user_avatar.url(:thumb),:height => 100, :width => 100, :class => 'img-polaroid' ) %>
            <% else %>
            <%= image_tag('nophoto.gif',:height => 100, :width => 100, :class => 'img-polaroid' ) %>
            <% end %>
            </p>
            <div class="introduction">
                <%= user.user_profile.introduction %>
            </div>

<% if user_signed_in? && current_user!=user %>          
<div class="follow_user" data-user-id="<%= user.id %>">
  <%= render :partial => "follow_user", :locals => {:user => user} %>
</div>
<% end %>

  <%= link_to sanitize('<i class="icon-pencil icon-white"></i> ') + 'Message', new_messages_path(user.username), :class => 'btn btn-primary'  %>


                <%= link_to sanitize('<i class="icon-user icon-white"></i> ') + 'Profile', show_user_path(:username => user.username, :breadcrumb => @from), :class => 'btn btn-info' %>              

        </div>
    </div>
   <% end %>
  </tbody>  
</table>

页面加载时的html（图1）

<div class="follow_user" data-user-id="3">
        <form action="/users/3/follows/133" class="button_to" data-remote="true" method="post"><div><input name="_method" type="hidden" value="delete" /><input class="btn" type="submit" value="Un-Follow" /><input name="authenticity_token" type="hidden" value="eVjePZ0ajS3NfXJLDBkELnpNwyt8k1f59FiT8iv/Xb8=" /></div></form>

</div>

按下按钮时的 html（图 3）

<div class="follow_user" data-user-id="3">
        <form action="/users/3/follows/133" class="button_to" data-remote="true" method="post"><div><input name="_method" type="hidden" value="delete" /><input class="btn" type="submit" value="Un-Follow" /><input name="authenticity_token" type="hidden" value="S92bRkGcbMz/puQvia4m7IOtrTsO2iCThiaHlBaXmJU=" /></div></form>

</div>
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