http://wenku.baidu.com/link?url=oA1l_ukbR_aB_bhWbZDZDGreKnpYcZbsMTvF4KUYPE5nhe2jLRWkS7RP-vqNf4qCDHiPGtjVR0eJBeqV2XCykp2vakJ_O_QY2vF5XOl6ODy
链接的资料很详细,内部结构记住上图即可.
http://wenku.baidu.com/link?url=oA1l_ukbR_aB_bhWbZDZDGreKnpYcZbsMTvF4KUYPE5nhe2jLRWkS7RP-vqNf4qCDHiPGtjVR0eJBeqV2XCykp2vakJ_O_QY2vF5XOl6ODy
链接的资料很详细,内部结构记住上图即可.