trustieforge/app/views/watchers/_set_watcher.js.erb

<% if( params[:object_type] == 'user') %>
  //点击头像下面的添加关注按钮
  <% if( params[:target_id] == params[:object_id] ) %>
    $("#watch_user_btn").html("<%= escape_javascript render(:partial => "layouts/user_watch_btn", :locals => {:target => watched.first}) %>");
    $("#user_fans_number").html("<%= watched.first.watcher_users.count.to_s%>");
  //在当前用户的粉丝、关注页面
  <% elsif( params[:target_id] == User.current.id.to_s )%>

  //在其他用户的粉丝、关注页面
  <% else %>

  <% end %>
<% else %>

<% selector = ".#{watcher_css(watched)}" %>
<% id_selector = "#{watcher_css(watched)}" %>
if($("<%= selector %>").get(0) == undefined)
{
  $("#<%= id_selector %>").each(function(){$(this).replaceWith("<%= escape_javascript watcher_link_for_project(watched, user) %>")});
}
else
{
  $("<%= selector %>").each(function(){$(this).replaceWith("<%= escape_javascript watcher_link(watched, user) %>")});
}

<% end %>