在Nginx上安装symfony2无法加载CSS

我有一个问题,我想在nginx上安装symfony2,框架已安装但未加载css,js,img.因此,我只查看没有样式的主页.我的安装：

server {
listen 80;
server_name symfony.dev;
root /home/vagrant/Workspace/symfony/web;

access_log off;
error_log  /var/log/nginx/symfony.dev-error.log error;

location / {
    # try to serve file directly,fallback to app.php
    try_files $uri /app.php$is_args$args;
}

location ~ ^/(app|app_dev|config).php(/|$) {
    fastcgi_pass unix:/var/run/php5-fpm.sock;
    fastcgi_split_path_info ^(.+.php)(/.*)$;
    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param HTTPS off;
}

}

我在/etc/nginx/nginx.conf中查看,有：

include /etc/nginx/mime.types;

在mime.types中存在css,js等.
请帮帮我！
提前Thnx