javascr ipt取得机器名，用户名，读写注册表，启动应用程序时要用到的。-javascr ipt access to the machine name, user name, read and write the registry, start the application into use.

应用php，javascr ipt，实现简单的用户注册功能，与数据库交互，判断用户是否存在。-Application php, javascr ipt, simple user registration function to interact with the database to determine whether the user exists.