Dojo 体系架构总体上来看是一个分层的体系架构，最下面的一层是包系统，Dojo API 的结构与 Java 很类似，它把所有的 API 分成不
同的包（package），当您要使用某个 API 时，只需导入这个 API 所在的包。包系统上面一层是语言库，这个语言库里包含一些语言工具 API，类似于 Java
的 util 包。再上一层是环境相关包，这个包的功能是处理跨浏览器的问题。Dojo 体系架构图(Dojo architecture is generally a layered architecture. The bottom layer is the package system. The structure of the Dojo API is similar to the Java, which divides all API into no one.

The same package (package), when you want to use a API, you only need to import the package that the API is in. The upper layer of the package system is the language library, which contains some language tools, API, which is similar to Java.

The util package. The last layer is the environment related package. The function of this package is to deal with cross browser problems. Dojo architecture diagram

Most of Dojo code is located in the application support library. Due to too small constraints, all packages in the diagram are not listed. Developers are calling API in this layer most of the time, for example, IO packets can be used for Ajax calls.)