[OWT server] customized script 3: server construction

• build.js It's a place that depends on node Explain the executed script
• be responsible for nodejs Module and cpp addon The construction of
• Used gyp and nodegyp Encapsulation to build .

C++ addons It's a glue layer

• Dynamic connection shared library

• Addons are dynamically-linked shared objects written in C++.

• addon Library as a nodejs Of module load .
  The require() function can load addons as ordinary Node.js modules.

• js and c++ The interface layer of

Addons provide an interface between JavaScript and C/C++ libraries.

• Three realizations addons The way ：Node-API, nan, Or internal V8、libuv and Nodejs Direct calls to libraries .

• It's usually used directly Node-API （ Unless Node-API There are no exposed internal methods ）.
  There are three options for implementing addons: Node-API, nan, or direct use of internal V8, libuv and Node.js libraries. Unless there is a need for direct access to functionality which is not exposed by Node-API, use Node-API. Refer to C/C++ addons with Node-API for