在 Nodejs 中，当我 console.log 一个 req 对象时，[Circular] 引用了什么?如何确定 [英] In Nodejs, when I console.log a req object, what does [Circular] reference? How to determine that
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问题描述
在Nodejs中，当我console.log一个req对象时，[Circular]是什么意思?
In Nodejs, when I console.log a req object, what does [Circular] mean?
这是一个针对基本 nodejs 示例的示例 console.log(req).注意 request.socket._readWatcher.socket 是一个 [Circular].这是否意味着它指的是自己?我该如何取消引用?
Here's an example console.log(req) against a basic nodejs example. Notice the request.socket._readWatcher.socket is a [Circular]. Does that mean it refers to itself? How can I dereference that?
{ socket:
{ bufferSize: 0,
fd: 7,
type: 'tcp4',
allowHalfOpen: true,
_readWatcher:
{ socket: [Circular],
callback: [Function: onReadable] },
destroyed: false,
readable: true,
_writeQueue: [],
_writeQueueEncoding: [],
_writeQueueFD: [],
_writeQueueCallbacks: [],
_writeWatcher:
{ socket: [Circular],
callback: [Function: onWritable] },
writable: true,
_writeImpl: [Function],
_readImpl: [Function],
_shutdownImpl: [Function],
remoteAddress: '127.0.1.1',
remotePort: 40407,
server:
{ connections: 1,
allowHalfOpen: true,
watcher: [Object],
_events: [Object],
httpAllowHalfOpen: false,
type: 'tcp4',
fd: 5 },
ondrain: [Function],
_idleTimeout: 120000,
_idleNext:
{ repeat: 120,
_idleNext: [Circular],
_idlePrev: [Circular],
callback: [Function] },
_idlePrev:
{ repeat: 120,
_idleNext: [Circular],
_idlePrev: [Circular],
callback: [Function] },
_idleStart: Sun, 15 May 2011 01:18:50 GMT,
_events:
{ timeout: [Function],
error: [Function],
close: [Function] },
ondata: [Function],
onend: [Function],
_httpMessage:
{ output: [],
outputEncodings: [],
writable: true,
_last: false,
chunkedEncoding: true,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
_hasBody: true,
_trailer: '',
finished: false,
socket: [Circular],
connection: [Circular],
_events: [Object],
_header: 'HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nConnection: keep-alive\r\nTransfer-Encoding: chunked\r\n\r\n',
_headerSent: false } },
connection:
{ bufferSize: 0,
fd: 7,
type: 'tcp4',
allowHalfOpen: true,
_readWatcher:
{ socket: [Circular],
callback: [Function: onReadable] },
destroyed: false,
readable: true,
_writeQueue: [],
_writeQueueEncoding: [],
_writeQueueFD: [],
_writeQueueCallbacks: [],
_writeWatcher:
{ socket: [Circular],
callback: [Function: onWritable] },
writable: true,
_writeImpl: [Function],
_readImpl: [Function],
_shutdownImpl: [Function],
remoteAddress: '127.0.1.1',
remotePort: 40407,
server:
{ connections: 1,
allowHalfOpen: true,
watcher: [Object],
_events: [Object],
httpAllowHalfOpen: false,
type: 'tcp4',
fd: 5 },
ondrain: [Function],
_idleTimeout: 120000,
_idleNext:
{ repeat: 120,
_idleNext: [Circular],
_idlePrev: [Circular],
callback: [Function] },
_idlePrev:
{ repeat: 120,
_idleNext: [Circular],
_idlePrev: [Circular],
callback: [Function] },
_idleStart: Sun, 15 May 2011 01:18:50 GMT,
_events:
{ timeout: [Function],
error: [Function],
close: [Function] },
ondata: [Function],
onend: [Function],
_httpMessage:
{ output: [],
outputEncodings: [],
writable: true,
_last: false,
chunkedEncoding: true,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
_hasBody: true,
_trailer: '',
finished: false,
socket: [Circular],
connection: [Circular],
_events: [Object],
_header: 'HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nConnection: keep-alive\r\nTransfer-Encoding: chunked\r\n\r\n',
_headerSent: false } },
httpVersion: '1.1',
complete: false,
headers:
{ 'user-agent': 'curl/7.21.0 (x86_64-pc-linux-gnu) libcurl/7.21.0 OpenSSL/0.9.8o zlib/1.2.3.4 libidn/1.18',
host: 'uh-uh-uh-I-aint-telling',
accept: '*/*' },
trailers: {},
readable: true,
url: '/',
method: 'GET',
statusCode: null,
client:
{ bufferSize: 0,
fd: 7,
type: 'tcp4',
allowHalfOpen: true,
_readWatcher:
{ socket: [Circular],
callback: [Function: onReadable] },
destroyed: false,
readable: true,
_writeQueue: [],
_writeQueueEncoding: [],
_writeQueueFD: [],
_writeQueueCallbacks: [],
_writeWatcher:
{ socket: [Circular],
callback: [Function: onWritable] },
writable: true,
_writeImpl: [Function],
_readImpl: [Function],
_shutdownImpl: [Function],
remoteAddress: '127.0.1.1',
remotePort: 40407,
server:
{ connections: 1,
allowHalfOpen: true,
watcher: [Object],
_events: [Object],
httpAllowHalfOpen: false,
type: 'tcp4',
fd: 5 },
ondrain: [Function],
_idleTimeout: 120000,
_idleNext:
{ repeat: 120,
_idleNext: [Circular],
_idlePrev: [Circular],
callback: [Function] },
_idlePrev:
{ repeat: 120,
_idleNext: [Circular],
_idlePrev: [Circular],
callback: [Function] },
_idleStart: Sun, 15 May 2011 01:18:50 GMT,
_events:
{ timeout: [Function],
error: [Function],
close: [Function] },
ondata: [Function],
onend: [Function],
_httpMessage:
{ output: [],
outputEncodings: [],
writable: true,
_last: false,
chunkedEncoding: true,
shouldKeepAlive: true,
useChunkedEncodingByDefault: true,
_hasBody: true,
_trailer: '',
finished: false,
socket: [Circular],
connection: [Circular],
_events: [Object],
_header: 'HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\nConnection: keep-alive\r\nTransfer-Encoding: chunked\r\n\r\n',
_headerSent: false } },
httpVersionMajor: 1,
httpVersionMinor: 1,
upgrade: false }
更新
由于我显然没有尽可能清楚，我如何取消引用循环引用的元素?总是父元素吗?
UPDATE
Since I apparently wasn't as clear as I could have been, how can I dereference what element is being referenced circularly? Is it always the parent element?
另外值得注意的是，昨晚我了解了 Utils 类和检查方法.这可能会给我提供比我合理想知道的更多的信息;)
Also of note, last night I learned about the Utils class, and the inspect method. Which will probably give me way more information about this than I should reasonably want to know ;)
推荐答案
[Circular] 仅表示循环引用.
var o = {
"self": o
}
显示为
{
"self": [Circular]
}
可以显示为
{
"self": {
"self": {
"self": {
...
}
}
}
}
在您的情况下 socket 是外部套接字.
In your case socket is the outer socket.
而且 _idleNext 和 _idlePrev 也指向外面的.
And _idleNext and _idlePrev also point to the outer ones.
更新
_idleNext: // This one!
{ repeat: 120,
_idleNext: [Circular],
{ socket: // this one!
{ bufferSize: 0,
fd: 7,
type: 'tcp4',
allowHalfOpen: true,
_readWatcher:
{ socket: [Circular],
callback: [Function: onReadable] },
destroyed: false,
readable: true,
_writeQueue: [],
_writeQueueEncoding: [],
_writeQueueFD: [],
_writeQueueCallbacks: [],
_writeWatcher:
{ socket: [Circular],
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