Request Promotional Codes 销售代码 ; 请求用于推销的代码
There are several types of electronic submissions (request or response types), several types of transaction codes and their corresponding descriptions.
有几种类型的电子提交(请求或响应类型)和几种类型的事务代码及其对应描述。
And in the Web world, HTTP codes can deal with the various things that might happen in a request.
而在Web世界中，HTTP代码可以处理请求中可能发生的各种问题。
When the ready state of a request changes, the function specified in req.onreadystatechange is invoked. req.readystate contains one of the following status codes
请求的就绪状态发生变化时，req.onreadystatechange 中指定的函数将被调用。
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