校园微博系统： 实现了微博的基本功能，包括用户注册，登录，前台的ajax，javascr ipt验证，用户发表微博，关注好友，增加了用户上传头像功能，MD5加密-Campus microblogging system: Microblogging features, including user registration, login, ajax, javascr ipt, validation of the foreground, the user issued a microblog