说明： 本章讨论了连接性的概念，介绍了两种实现脱机功能的主要方法，并且讨论了您在使应用程序可供脱机使用时需要考虑的一些问题。 (discussed in this chapter the concept of connectivity, introduced the two to achieve the main function offline, They will also discuss in your application to make use of available off the need to consider a number of issues.)
