response.write(chunk[, encoding][, callback])

如果调用此方法并且尚未调用 response.writeHead(),则将切换到隐式响应头模式并刷新隐式响应头。

这会发送一块响应主体。 可以多次调用该方法以提供连续的响应主体片段。

http 模块中,当请求是 HEAD 请求时,则省略响应主体。 同样地, 204304 响应不得包含消息主体。

chunk 可以是字符串或 buffer。 如果 chunk 是一个字符串,则第二个参数指定如何将其编码为字节流。 当刷新此数据块时将调用 callback

这是原始的 HTTP 主体,与可能使用的更高级别的多部分主体编码无关。

第一次调用 response.write() 时,它会将缓冲的响应头信息和主体的第一个数据块发送给客户端。 第二次调用 response.write() 时,Node.js 假定数据将被流式传输,并分别发送新数据。 也就是说,响应被缓冲到主体的第一个数据块。

如果将整个数据成功刷新到内核缓冲区,则返回 true。 如果全部或部分数据在用户内存中排队,则返回 false。 当缓冲区再次空闲时,则触发 'drain' 事件。

If this method is called and response.writeHead() has not been called, it will switch to implicit header mode and flush the implicit headers.

This sends a chunk of the response body. This method may be called multiple times to provide successive parts of the body.

In the http module, the response body is omitted when the request is a HEAD request. Similarly, the 204 and 304 responses must not include a message body.

chunk can be a string or a buffer. If chunk is a string, the second parameter specifies how to encode it into a byte stream. callback will be called when this chunk of data is flushed.

This is the raw HTTP body and has nothing to do with higher-level multi-part body encodings that may be used.

The first time response.write() is called, it will send the buffered header information and the first chunk of the body to the client. The second time response.write() is called, Node.js assumes data will be streamed, and sends the new data separately. That is, the response is buffered up to the first chunk of the body.

Returns true if the entire data was flushed successfully to the kernel buffer. Returns false if all or part of the data was queued in user memory. 'drain' will be emitted when the buffer is free again.