Standard output stream object 标准输出流对象
When the output is complete, the stream is flushed by writing a NULL object to the client stream and loop awaiting the next client.
输出完成后，通过向客户端流写入一个 NULL 对象，而且循环等待下一个客户端，从而刷新流。
The closure captures the information about the actual Web service method stub to be invoked (the function object called obj) as well as the stream for the log output.
闭包捕获真正被调用的Web服务方法存根(称为obj的函数对象)以及流作为日志输出。
By overriding the writeTo() method, the code converts the DojoTree object into a tree format and writes it in an HTTP Response output stream.
通过重写 writeTo() 方法，代码将 DojoTree 对象转换成一个树格式然后写入一个 HTTP Response 输出流。
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