anchor.diff:            <% if params["sort"] == 'ASC' %>
               <div class="btn--orders btn--sale-available active up">
             <% else %>
  -              <div class="btn--orders btn--sale-available active down">
  +            <div class="btn--orders btn--sale-available active down">
             <% end %>
           <% else %>
             <div class="btn--orders btn--sale-available">
  
positive.code:         <% if params["sort"] == 'ASC' %>
            <div class="btn--orders btn--sale-price active up">
          <% else %>
              <div class="btn--orders btn--sale-price active down">
          <% end %>
        <% else %>
          <div class="btn--orders btn--sale-price">
  
negative.code:         </div>
          <% if @all_locations.length > 20 %>
            <div class="collapse-btn pull-left text-right">
              <div class="btn open-btn">展开 <small><span class="glyphicon glyphicon-chevron-down"></span></small></div>
              <div class="btn close-btn">收起 <small><span class="glyphicon glyphicon-chevron-up"></span></small></div>
            </div>
          <% end %>
        </div>
  