Nignx允许图片跨域

location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
{
    #允许跨域
    add_header Access-Control-Allow-Origin '*';
    add_header Access-Control-Allow-Headers X-Requested-With;
    add_header Access-Control-Allow-Methods GET,POST,OPTIONS;
    expires      30d;
    error_log /dev/null;
    access_log /dev/null;
}