最近迷惑的地方

1.php中突破基于HTTP_REFERER的防盗链措施(stream_context_create)

         http://www.jb51.net/article/26670.htm

         http://www.jb51.net/article/8431.htm

         http://www.jb51.net/article/57685.htm

2.巧用Ajax的beforeSend 提高用户体验 

         http://www.cnblogs.com/fanyong/p/3883670.html

         http://www.jb51.net/article/44609.htm

         http://www.cnblogs.com/haogj/archive/2011/02/16/1956523.html

3.