Rails Ajax请求不起作用

I have some problem with ajax

This request GET http://localhost:3000/projects/new (304 Not Modified) does work, it executes javascript from response:

$('#add-project-button').hide();
$('#project-form').append("<form accept-charset=\"UTF-8\" action=\"/projects\" class=\"new_project\" data-remote=\"true\" id=\"new_project\" method=\"post\"><div style=\"margin:0;padding:0;display:inline\"><input name=\"utf8\" type=\"hidden\" value=\"&#x2713;\" /><input name=\"authenticity_token\" type=\"hidden\" value=\"gzu9DETiVV8N+OtRnkdYpD6aa0/RbM7i2H+nkQ0yXGc=\" /><\/div>
  <div class=\"field\">
    <label for=\"project_name\">Name<\/label><br />
    <input id=\"project_name\" name=\"project[name]\" size=\"30\" type=\"text\" />
  <\/div>
  <div class=\"actions\"><input name=\"commit\" type=\"submit\" value=\"Create Project\" /><\/div>
<\/form>");

But another request POST http://localhost:3000/projects (200 OK) seems ok but response is empty, no javascript is executing, but the server answer is ok:

Rendered tasks/_task.html.erb (0.0ms)
  Rendered projects/_project.html.erb (4.5ms)
  Rendered shared/_create.js.erb (5.4ms)
  Rendered projects/create.js.erb (6.1ms)
Completed 200 OK in 96ms (Views: 8.6ms | ActiveRecord: 84.9ms)

So I'm guessing that the browser somehow is of not supposed to execute javascript from server in this case.

What might be a problem? How to make browser receive the javascript and execute it? Thanks.

UPDATE: The form which is making ajax request:

<%= form_for(@project, :remote => true) do |f| %>
  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <div class="actions"><%= f.submit %></div>
<% end %>

The controller action:

def create
  @project = current_user.projects.build(params[:project])
  respond_with(@project.tap(&:save))
end

Maybe the problem is causing by using partial as layout, projects/create.js.erb:

<% render :layout => '/shared/create', locals: { obj: @project } do %>
  $('#project-container').append("<%= escape_javascript render(@project) %>");
  $('#add-project-button').show('fast');
  $('#project-form').hide('fast', function(){ $('#project-form').empty(); });
<% end %>

The problem was very simple, I forget to put <%= sign in erb, so it should be:

<%= render :layout => '/shared/create', locals: { obj: @project } do %>
  $('#project-container').append("<%= escape_javascript render(@project) %>");
  $('#add-project-button').show('fast');
  $('#project-form').hide('fast', function(){ $('#project-form').empty(); });
<% end %>