blocks|key|712258|text|如果您正在寻找生产环境中的应用程序，winston可能是最佳选择。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|712259|如果你只是想快速做开发工作，直接输出到一个文件中(我认为这只适用于*nix系统)：|712260|nohup+node+simple-server.js+>+output.log+&|code-block|syntax|javascript|712261|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/indexzero/winston^0|I|7|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

If you are looking for something in production <a href="https://github.com/indexzero/winston">winston</a> is probably the best choice.

If you just want to do dev stuff quickly, output directly to a file (I think this works only for *nix systems):

<pre><code>nohup node simple-server.js &gt; output.log &amp;
</code></pre>

blocks|key|496857|text|您现在可以使用Caterpillar，这是一个基于流的日志记录系统，允许您登录到它，然后通过管道将输出传输到不同的转换和位置。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|496858|输出到文件非常简单，如下所示：|496859|var+logger+=+new+(require('./').Logger)();
logger.pipe(require('fs').createWriteStream('./debug.log'));
logger.log('your+log+message');|code-block|syntax|javascript|496860|Caterpillar+Website上的完整示例|496861|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/bevry/caterpillar|1^0|7|B|0|0|0|0|0|J|1|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|6|7|Z|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|10|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|11|8|@]|9|@$A|12|B|13|1|14]]|C|$]]|$1|M|3|-4|5|6|7|15|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]|U|$5|P|Q|R|C|$S|T]]]]

You can now use <a href="https://github.com/bevry/caterpillar" rel="nofollow">Caterpillar</a> which is a streams based logging system, allowing you to log to it, then pipe the output off to different transforms and locations.

Outputting to a file is as easy as:

<pre><code>var logger = new (require('./').Logger)();
logger.pipe(require('fs').createWriteStream('./debug.log'));
logger.log('your log message');
</code></pre>

Complete example on the <a href="https://github.com/bevry/caterpillar" rel="nofollow">Caterpillar Website</a>

blocks|key|496912|text|覆盖console.log是一种可行的方法。但是为了让它在所需的模块中工作，您还需要将其导出。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|496913|module.exports+=+console;|code-block|syntax|javascript|496914|为了省去写日志文件、轮换等等的麻烦，你可以考虑使用一个简单的记录器模块，比如winston：|496915|//+Include+the+logger+module
var+winston+=+require('winston');
//+Set+up+log+file.+(you+can+also+define+size,+rotation+etc.)
winston.add(winston.transports.File,+{+filename:+'somefile.log'+});
//+Overwrite+some+of+the+build-in+console+functions
console.error+=+winston.error;
console.log+=+winston.info;
console.info+=+winston.info;
console.debug+=+winston.debug;
console.warn+=+winston.warn;
module.exports+=+console;|496916|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

Overwriting console.log is the way to go. But for it to work in required modules, you also need to export it.

<pre><code>module.exports = console;
</code></pre>

To save yourself the trouble of writing log files, rotating and stuff, you might consider using a simple logger module like winston:

<pre><code>// Include the logger module
var winston = require('winston');
// Set up log file. (you can also define size, rotation etc.)
winston.add(winston.transports.File, { filename: 'somefile.log' });
// Overwrite some of the build-in console functions
console.error = winston.error;
console.log = winston.info;
console.info = winston.info;
console.debug = winston.debug;
console.warn = winston.warn;
module.exports = console;
</code></pre>

blocks|key|496956|text|您还可以查看npm模块：https://www.npmjs.com/package/noogger|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|496957|noogger|496958|简单明了。|496959|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/noogger|1|http://xsmael.github.io/noogger/^0|C|11|0|0|0|7|1|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@$A|S|B|T|1|U]]|C|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$A|W|B|X|1|Y]]|C|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]|P|$5|K|L|M|C|$N|Q]]]]

You can also have a look at this npm module:
<a href="https://www.npmjs.com/package/noogger" rel="nofollow noreferrer">https://www.npmjs.com/package/noogger</a>

<a href="http://xsmael.github.io/noogger/" rel="nofollow noreferrer">noogger</a>

simple and straight forward...

blocks|key|712551|text|Winston是一个非常流行的用于日志记录的npm模块。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|712552|这里有一个操作指南。|712553|在项目中安装winston，如下所示：|712554|npm+install+winston+--save|code-block|syntax|javascript|712555|下面是一个开箱即用的配置，我在项目中经常使用它作为utils下的logger.js。|712556|+/**
+*+Configurations+of+logger.
+*/
const+winston+=+require('winston');
const+winstonRotator+=+require('winston-daily-rotate-file');

const+consoleConfig+=+[
++new+winston.transports.Console({
++++'colorize':+true
++})
];

const+createLogger+=+new+winston.Logger({
++'transports':+consoleConfig
});

const+successLogger+=+createLogger;
successLogger.add(winstonRotator,+{
++'name':+'access-file',
++'level':+'info',
++'filename':+'./logs/access.log',
++'json':+false,
++'datePattern':+'yyyy-MM-dd-',
++'prepend':+true
});

const+errorLogger+=+createLogger;
errorLogger.add(winstonRotator,+{
++'name':+'error-file',
++'level':+'error',
++'filename':+'./logs/error.log',
++'json':+false,
++'datePattern':+'yyyy-MM-dd-',
++'prepend':+true
});

module.exports+=+{
++'successlog':+successLogger,
++'errorlog':+errorLogger
};|712557|然后只需在需要的地方导入，如下所示：|712558|const+errorLog+=+require('../util/logger').errorlog;
const+successlog+=+require('../util/logger').successlog;|712559|然后，您可以将成功记录为：|712560|successlog.info(`Success+Message+and+variables:+${variable}`);|712561|和错误，如：|712562|errorlog.error(`Error+Message+:+${error}`);|712563|它还将所有成功日志和错误日志按日期记录在logs目录下的一个文件中，如您在此处所见。|712564|📷|atomic|712565|​|712566|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/winstonjs/winston|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/e0c64d09942273068c17fdabd05f7170.png|imageAlt^0|0|7|0|0|0|0|0|0|0|0|0|0|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|1N|8|@]|9|@$A|1O|B|1P|1|1Q]]|C|$]]|$1|D|3|E|5|6|7|1R|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|1S|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|1T|8|@]|9|@]|C|$K|L]]|$1|M|3|N|5|6|7|1U|8|@]|9|@]|C|$]]|$1|O|3|P|5|J|7|1V|8|@]|9|@]|C|$K|L]]|$1|Q|3|R|5|6|7|1W|8|@]|9|@]|C|$]]|$1|S|3|T|5|J|7|1X|8|@]|9|@]|C|$K|L]]|$1|U|3|V|5|6|7|1Y|8|@]|9|@]|C|$]]|$1|W|3|X|5|J|7|1Z|8|@]|9|@]|C|$K|L]]|$1|Y|3|Z|5|6|7|20|8|@]|9|@]|C|$]]|$1|10|3|11|5|J|7|21|8|@]|9|@]|C|$K|L]]|$1|12|3|13|5|6|7|22|8|@]|9|@]|C|$]]|$1|14|3|15|5|16|7|23|8|@]|9|@$A|24|B|25|1|26]]|C|$]]|$1|17|3|18|5|6|7|27|8|@]|9|@]|C|$]]|$1|19|3|-4|5|6|7|28|8|@]|9|@]|C|$]]]|1A|$1B|$5|1C|1D|1E|C|$1F|1G]]|1H|$5|1I|1D|1J|C|$1K|1L|1M|-4]]]]

<a href="https://github.com/winstonjs/winston" rel="noreferrer">Winston</a> is a very-popular npm-module used for logging. 

Here is a how-to. 
Install winston in your project as:

<pre><code>npm install winston --save
</code></pre>

Here's a configuration ready to use out-of-box that I use frequently in my projects as logger.js under utils.

<pre><code> /**
 * Configurations of logger.
 */
const winston = require('winston');
const winstonRotator = require('winston-daily-rotate-file');

const consoleConfig = [
 new winston.transports.Console({
 'colorize': true
 })
];

const createLogger = new winston.Logger({
 'transports': consoleConfig
});

const successLogger = createLogger;
successLogger.add(winstonRotator, {
 'name': 'access-file',
 'level': 'info',
 'filename': './logs/access.log',
 'json': false,
 'datePattern': 'yyyy-MM-dd-',
 'prepend': true
});

const errorLogger = createLogger;
errorLogger.add(winstonRotator, {
 'name': 'error-file',
 'level': 'error',
 'filename': './logs/error.log',
 'json': false,
 'datePattern': 'yyyy-MM-dd-',
 'prepend': true
});

module.exports = {
 'successlog': successLogger,
 'errorlog': errorLogger
};
</code></pre>

And then simply import wherever required as this:

<pre><code>const errorLog = require('../util/logger').errorlog;
const successlog = require('../util/logger').successlog;
</code></pre>

Then you can log the success as:

<pre><code>successlog.info(`Success Message and variables: ${variable}`);
</code></pre>

and Errors as:

<pre><code>errorlog.error(`Error Message : ${error}`);
</code></pre>

It also logs all the success-logs and error-logs in a file under logs directory date-wise as you can see here. 
<a href="https://i.stack.imgur.com/BCAIU.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BCAIU.png" alt="log direcotry"></a>

blocks|key|712620|text|另一种尚未提及的解决方案是在process.stdout和process.stderr中挂钩Writable流。这样，您就不需要覆盖输出到标准输出和标准错误的all+the+console+functions。此实现将stdout和stderr重定向到日志文件：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|712621|var+log_file+=+require('fs').createWriteStream(__dirname+%2B+'/log.txt',+{flags+:+'w'})

function+hook_stream(stream,+callback)+{
++++var+old_write+=+stream.write

++++stream.write+=+(function(write)+{
++++++++return+function(string,+encoding,+fd)+{
++++++++++++write.apply(stream,+arguments)++//+comments+this+line+if+you+don't+want+output+in+the+console
++++++++++++callback(string,+encoding,+fd)
++++++++}
++++})(stream.write)

++++return+function()+{
++++++++stream.write+=+old_write
++++}
}

console.log('a')
console.error('b')

var+unhook_stdout+=+hook_stream(process.stdout,+function(string,+encoding,+fd)+{
++++log_file.write(string,+encoding)
})

var+unhook_stderr+=+hook_stream(process.stderr,+function(string,+encoding,+fd)+{
++++log_file.write(string,+encoding)
})

console.log('c')
console.error('d')

unhook_stdout()
unhook_stderr()

console.log('e')
console.error('f')|code-block|syntax|javascript|712622|它应该在控制台中打印|712623|a
b
c
d
e
f|712624|在日志文件中：|712625|c
d|712626|有关更多信息，请查看此gist。|712627|entityMap|0|LINK|mutability|MUTABLE|url|https://nodejs.org/api/console.html|1|https://gist.github.com/pguillory/729616^0|E|E|T|E|1A|8|27|P|0|0|0|0|0|0|0|B|4|1|0^^$0|@$1|2|3|4|5|6|7|14|8|@$9|15|A|16|B|C]|$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@$9|1B|A|1C|1|1D]]|E|$]]|$1|F|3|G|5|H|7|1E|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|1F|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|1G|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|1H|8|@]|D|@]|E|$]]|$1|Q|3|R|5|H|7|1I|8|@]|D|@]|E|$I|J]]|$1|S|3|T|5|6|7|1J|8|@]|D|@$9|1K|A|1L|1|1M]]|E|$]]|$1|U|3|-4|5|6|7|1N|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|X|Y|Z|E|$10|13]]]]

Another solution not mentioned yet is by hooking the <code>Writable</code> streams in <code>process.stdout</code> and <code>process.stderr</code>. This way you don't need to override <a href="https://nodejs.org/api/console.html" rel="noreferrer">all the console functions</a> that output to stdout and stderr. This implementation redirects both stdout and stderr to a log file:

<pre><code>var log_file = require('fs').createWriteStream(__dirname + '/log.txt', {flags : 'w'})

function hook_stream(stream, callback) {
 var old_write = stream.write

 stream.write = (function(write) {
 return function(string, encoding, fd) {
 write.apply(stream, arguments) // comments this line if you don't want output in the console
 callback(string, encoding, fd)
 }
 })(stream.write)

 return function() {
 stream.write = old_write
 }
}

console.log('a')
console.error('b')

var unhook_stdout = hook_stream(process.stdout, function(string, encoding, fd) {
 log_file.write(string, encoding)
})

var unhook_stderr = hook_stream(process.stderr, function(string, encoding, fd) {
 log_file.write(string, encoding)
})

console.log('c')
console.error('d')

unhook_stdout()
unhook_stderr()

console.log('e')
console.error('f')
</code></pre>

It should print in the console

<pre><code>a
b
c
d
e
f
</code></pre>

and in the log file:

<pre><code>c
d
</code></pre>

For more info, check this <a href="https://gist.github.com/pguillory/729616" rel="noreferrer">gist</a>.

blocks|key|712670|text|const+fs+=+require("fs");
const+{keys}+=+Object;
const+{Console}+=+console;

/**
+*+Redirect+console+to+a+file.++Call+without+path+or+with+false-y
+*+value+to+restore+original+behavior.
+*+@param+{string}+[path]
+*/
function+file(path)+{
++++const+con+=+path+?+new+Console(fs.createWriteStream(path))+:+null;

++++keys(Console.prototype).forEach(key+=>+{
++++++++if+(path)+{
++++++++++++this[key]+=+(...args)+=>+con[key](...args);
++++++++}+else+{
++++++++++++delete+this[key];
++++++++}
++++});
};

//+patch+global+console+object+and+export
module.exports+=+console.file+=+file;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|712671|要使用它，请执行以下操作：|unstyled|712672|require("./console-file");
console.file("/path/to.log");
console.log("write+to+file!");
console.error("also+write+to+file!");
console.file();++++//+go+back+to+writing+to+stdout|712673|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>const fs = require("fs");
const {keys} = Object;
const {Console} = console;

/**
 * Redirect console to a file. Call without path or with false-y
 * value to restore original behavior.
 * @param {string} [path]
 */
function file(path) {
 const con = path ? new Console(fs.createWriteStream(path)) : null;

 keys(Console.prototype).forEach(key =&gt; {
 if (path) {
 this[key] = (...args) =&gt; con[key](...args);
 } else {
 delete this[key];
 }
 });
};

// patch global console object and export
module.exports = console.file = file;
</code></pre>

To use it, do something like:

<pre><code>require("./console-file");
console.file("/path/to.log");
console.log("write to file!");
console.error("also write to file!");
console.file(); // go back to writing to stdout
</code></pre>

blocks|key|712722|text|直接从Console上的nodejs应用编程接口文档|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|712723|const+output+=+fs.createWriteStream('./stdout.log');
const+errorOutput+=+fs.createWriteStream('./stderr.log');
//+custom+simple+logger
const+logger+=+new+Console(output,+errorOutput);
//+use+it+like+console
const+count+=+5;
logger.log('count:+%25d',+count);
//+in+stdout.log:+count+5|code-block|syntax|javascript|712724|entityMap|0|LINK|mutability|MUTABLE|url|https://nodejs.org/api/console.html^0|3|7|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Straight from nodejs's API docs on <a href="https://nodejs.org/api/console.html" rel="nofollow noreferrer">Console</a>

<pre><code>const output = fs.createWriteStream('./stdout.log');
const errorOutput = fs.createWriteStream('./stderr.log');
// custom simple logger
const logger = new Console(output, errorOutput);
// use it like console
const count = 5;
logger.log('count: %d', count);
// in stdout.log: count 5
</code></pre>

blocks|key|712803|text|我接受了将输出流交换到my流的想法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|712804|const+LogLater++++++++++++++++=+require+('./loglater.js');
var+logfile=new+LogLater(+'log'%2B(+new+Date().toISOString().replace(/[%5Ea-zA-Z0-9]/g,'-')+)%2B'.txt'+);


var+PassThrough+=+require('stream').PassThrough;

var+myout=+new+PassThrough();
var+wasout=console._stdout;
myout.on('data',(data)=>{logfile.dateline("\r\n"%2Bdata);wasout.write(data);});
console._stdout=myout;

var+myerr=+new+PassThrough();
var+waserr=console._stderr;
myerr.on('data',(data)=>{logfile.dateline("\r\n"%2Bdata);waserr.write(data);});
console._stderr=myerr;|code-block|syntax|javascript|712805|loglater.js：|712806|const+fs+=+require('fs');

function+LogLater(filename,+noduplicates,+interval)+{
++++this.filename+=+filename+%7C%7C+"loglater.txt";
++++this.arr+=+[];
++++this.timeout+=+false;
++++this.interval+=+interval+%7C%7C+1000;
++++this.noduplicates+=+noduplicates+%7C%7C+true;
++++this.onsavetimeout_bind+=+this.onsavetimeout.bind(this);
++++this.lasttext+=+"";
++++process.on('exit',()=>{+if(this.timeout)clearTimeout(this.timeout);this.timeout=false;+this.save();+})
}

LogLater.prototype+=+{
++++_log:+function+_log(text)+{
++++++++this.arr.push(text);
++++++++if+(!this.timeout)+this.timeout+=+setTimeout(this.onsavetimeout_bind,+this.interval);
++++},
++++text:+function+log(text,+loglastline)+{
++++++++if+(this.noduplicates)+{
++++++++++++if+(this.lasttext+===+text)+return;
++++++++++++this.lastline+=+text;
++++++++}
++++++++this._log(text);
++++},
++++line:+function+log(text,+loglastline)+{
++++++++if+(this.noduplicates)+{
++++++++++++if+(this.lasttext+===+text)+return;
++++++++++++this.lastline+=+text;
++++++++}
++++++++this._log(text+%2B+'\r\n');
++++},
++++dateline:+function+dateline(text)+{
++++++++if+(this.noduplicates)+{
++++++++++++if+(this.lasttext+===+text)+return;
++++++++++++this.lastline+=+text;
++++++++}
++++++++this._log(((new+Date()).toISOString())+%2B+'\t'+%2B+text+%2B+'\r\n');
++++},
++++onsavetimeout:+function+onsavetimeout()+{
++++++++this.timeout+=+false;
++++++++this.save();
++++},
++++save:+function+save()+{+fs.appendFile(this.filename,+this.arr.splice(0,+this.arr.length).join(''),+function(err)+{+if+(err)+console.log(err.stack)+});+}
}

module.exports+=+LogLater;|712807|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I took on the idea of swapping the output stream to a my stream.

<pre><code>const LogLater = require ('./loglater.js');
var logfile=new LogLater( 'log'+( new Date().toISOString().replace(/[^a-zA-Z0-9]/g,'-') )+'.txt' );


var PassThrough = require('stream').PassThrough;

var myout= new PassThrough();
var wasout=console._stdout;
myout.on('data',(data)=&gt;{logfile.dateline("\r\n"+data);wasout.write(data);});
console._stdout=myout;

var myerr= new PassThrough();
var waserr=console._stderr;
myerr.on('data',(data)=&gt;{logfile.dateline("\r\n"+data);waserr.write(data);});
console._stderr=myerr;
</code></pre>

loglater.js:

<pre><code>const fs = require('fs');

function LogLater(filename, noduplicates, interval) {
 this.filename = filename || "loglater.txt";
 this.arr = [];
 this.timeout = false;
 this.interval = interval || 1000;
 this.noduplicates = noduplicates || true;
 this.onsavetimeout_bind = this.onsavetimeout.bind(this);
 this.lasttext = "";
 process.on('exit',()=&gt;{ if(this.timeout)clearTimeout(this.timeout);this.timeout=false; this.save(); })
}

LogLater.prototype = {
 _log: function _log(text) {
 this.arr.push(text);
 if (!this.timeout) this.timeout = setTimeout(this.onsavetimeout_bind, this.interval);
 },
 text: function log(text, loglastline) {
 if (this.noduplicates) {
 if (this.lasttext === text) return;
 this.lastline = text;
 }
 this._log(text);
 },
 line: function log(text, loglastline) {
 if (this.noduplicates) {
 if (this.lasttext === text) return;
 this.lastline = text;
 }
 this._log(text + '\r\n');
 },
 dateline: function dateline(text) {
 if (this.noduplicates) {
 if (this.lasttext === text) return;
 this.lastline = text;
 }
 this._log(((new Date()).toISOString()) + '\t' + text + '\r\n');
 },
 onsavetimeout: function onsavetimeout() {
 this.timeout = false;
 this.save();
 },
 save: function save() { fs.appendFile(this.filename, this.arr.splice(0, this.arr.length).join(''), function(err) { if (err) console.log(err.stack) }); }
}

module.exports = LogLater;
</code></pre>

blocks|key|712840|text|改进了Andres+Riofrio，可以处理任意数量的参数|type|unstyled|depth|inlineStyleRanges|entityRanges|data|712841|var+fs+=+require('fs');
var+util+=+require('util');

var+log_file+=+fs.createWriteStream(__dirname+%2B+'/debug.log',+{flags+:+'w'});
var+log_stdout+=+process.stdout;

console.log+=+function(...args)+{
++++var+output+=+args.join('+');
++++log_file.write(util.format(output)+%2B+'\r\n');
++++log_stdout.write(util.format(output)+%2B+'\r\n');
};|code-block|syntax|javascript|712842|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Improve on Andres Riofrio , to handle any number of arguments

<pre><code>var fs = require('fs');
var util = require('util');

var log_file = fs.createWriteStream(__dirname + '/debug.log', {flags : 'w'});
var log_stdout = process.stdout;

console.log = function(...args) {
 var output = args.join(' ');
 log_file.write(util.format(output) + '\r\n');
 log_stdout.write(util.format(output) + '\r\n');
};
</code></pre>

blocks|key|497302|text|我只是构建了一个包来做这件事，希望你喜欢;)+https://www.npmjs.com/package/writelog|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|497303|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/writelog^0|N|12|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I just build a pack to do this, hope you like it ;)
<a href="https://www.npmjs.com/package/writelog" rel="nofollow noreferrer">https://www.npmjs.com/package/writelog</a>

blocks|key|497343|text|除了上面的答案，还有一点对简短而有效的代码的扩展，它覆盖了console.log。次要增加:设置文件名与日期，包装功能，也做了原始的console.logging，以保持控制台活动的信息。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|497344|用法:在代码的开头，运行setConsoleLogToFile([FILENAME])。|497345|const+fs+=+require("fs"),
++++util+=+require('util');


const+getPrettyDate+=+()=>+new+Date().toString().replace(":","-").replace(/00\s$.*$/,+"").replace(`+${new+Date().getFullYear()}`,+",").replace(/:\d\d\s/,+"+");

module.exports.getPrettyDate+=+getPrettyDate;

module.exports.setConsoleLogToFile+=+(filename)+=>+{
++++const+log_file+=+fs.createWriteStream(`${__dirname}/${filename}+-++${getPrettyDate()}.log`,+{+flags:+'w'+}),
++++++++log_stdout+=+process.stdout;

++++const+origConsole+=+console.log;
++++console.log+=+(d)+=>+{+
++++++++origConsole(d);
++++++++log_file.write(util.format(d)+%2B+'\n');
++++++++log_stdout.write(util.format(d)+%2B+'\n');
++++};
}|code-block|syntax|javascript|497346|entityMap^0|T|B|0|C|V|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

Adding to the answer above, a lit bit of an expansion to the short and efficient code overriding <code>console.log</code>. Minor additions: set filename with date, wrapper function, also do the original console.logging to keep the console active with the info.
Usage: in the beginning of your code, run <code>setConsoleLogToFile([FILENAME])</code>.
<pre><code>const fs = require(&quot;fs&quot;),
 util = require('util');


const getPrettyDate = ()=&gt; new Date().toString().replace(&quot;:&quot;,&quot;-&quot;).replace(/00\s$.*$/, &quot;&quot;).replace(` ${new Date().getFullYear()}`, &quot;,&quot;).replace(/:\d\d\s/, &quot; &quot;);

module.exports.getPrettyDate = getPrettyDate;

module.exports.setConsoleLogToFile = (filename) =&gt; {
 const log_file = fs.createWriteStream(`${__dirname}/${filename} - ${getPrettyDate()}.log`, { flags: 'w' }),
 log_stdout = process.stdout;

 const origConsole = console.log;
 console.log = (d) =&gt; { 
 origConsole(d);
 log_file.write(util.format(d) + '\n');
 log_stdout.write(util.format(d) + '\n');
 };
}
</code></pre>

blocks|key|712966|text|大多数记录器都是过度使用的，并且不支持正确的console.log构建。因此我创建了console-log-to-file|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|712967|import+{+consoleLogToFile+}+from+"console-log-to-file";
//+or+`const+{+consoleLogToFile+}+=+require("console-log-to-file/dist/index.cjs.js")`

consoleLogToFile({
++logFilePath:+"/log/default.log",
});

//+all+of+your+console.log/warn/error/info+will+work+as+it+does+and+save+to+file+now.|code-block|syntax|javascript|712968|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/rudyhuynh/console-log-to-file/^0|16|J|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

Most logger is overkill and does not support the build in console.log correctly. Hence I create <a href="https://github.com/rudyhuynh/console-log-to-file/" rel="nofollow noreferrer">console-log-to-file</a>:
<pre><code>import { consoleLogToFile } from &quot;console-log-to-file&quot;;
// or `const { consoleLogToFile } = require(&quot;console-log-to-file/dist/index.cjs.js&quot;)`

consoleLogToFile({
 logFilePath: &quot;/log/default.log&quot;,
});

// all of your console.log/warn/error/info will work as it does and save to file now.
</code></pre>

blocks|key|497555|text|如果您使用forever来保持节点应用程序的运行，那么输入forever+list也会显示console.log正在写入的日志文件的路径|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|497556|​|497557|📷|atomic|497558|497559|entityMap|0|LINK|mutability|MUTABLE|url|https://www.npmjs.com/package/forever|1|IMAGE|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/2cf85c27ff83e9eed5e1e5af11e9061c.png|imageAlt^0|T|C|5|7|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@$9|10|A|11|B|C]]|D|@$9|12|A|13|1|14]]|E|$]]|$1|F|3|G|5|6|7|15|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|16|8|@]|D|@$9|17|A|18|1|19]]|E|$]]|$1|K|3|G|5|6|7|1A|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S]]|T|$5|U|P|V|E|$W|X|Y|-4]]]]

if you are using <a href="https://www.npmjs.com/package/forever" rel="nofollow noreferrer">forever</a> to keep your node app running, then typing <code>forever list</code> will show you the path to the log file that console.log is writing too
<a href="https://i.stack.imgur.com/1sut5.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/1sut5.png" alt="enter image description here" /></a>

blocks|key|713082|text|使用以下命令创建utils/logger.js文件：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|713083|var+fs+=+require('fs');
var+util+=+require('util');
var+log_file+=+fs.createWriteStream(__dirname+%2B+'/../logs/server.log',+{+flags:+'w'+});
var+log_stdout+=+process.stdout;

console.log+=+function+()+{+//
++++[...arguments].forEach(element+=>+{
++++++++log_file.write(util.format(element)+%2B+'\n');
++++++++log_stdout.write(util.format(element)+%2B+'\n');
++++});
};

module.exports+=+{
++++console
}|code-block|syntax|javascript|713084|包括您想要console.log的任何文件中的logger.js文件，如下所示：|713085|const+console+=+require('./utils/logger').console;|713086|创建一个logs文件夹并在其中创建一个空的server.log文件，然后运行您的应用程序:)|713087|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|S|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Create a utils/logger.js file with:
<pre><code>var fs = require('fs');
var util = require('util');
var log_file = fs.createWriteStream(__dirname + '/../logs/server.log', { flags: 'w' });
var log_stdout = process.stdout;

console.log = function () { //
 [...arguments].forEach(element =&gt; {
 log_file.write(util.format(element) + '\n');
 log_stdout.write(util.format(element) + '\n');
 });
};

module.exports = {
 console
}
</code></pre>
Include the logger.js file from any file where you want to console.log like:
<pre><code>const console = require('./utils/logger').console;
</code></pre>
Create a logs folder and create an empty server.log file in it and run your app :)

blocks|key|497617|text|基于multiparameter+version+by+Clément，只是文本文件没有颜色编码|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|497618|var+fs+=+require('fs');
var+util+=+require('util');
var+logFile+=+fs.createWriteStream('log.txt',+{+flags:+'w'+});
++//+Or+'w'+to+truncate+the+file+every+time+the+process+starts.
var+logStdout+=+process.stdout;

console.log+=+function+()+{
++//+Storing+without+color+codes
++logFile.write(util.format.apply(null,arguments).replace(/\033\[[0-9;]*m/g,"")+%2B+'\n');
++//+Display+normally,+with+colors+to+Stdout
++logStdout.write(util.format.apply(null,+arguments)+%2B+'\n');
}|code-block|syntax|javascript|497619|备注:回答，因为我无法评论|497620|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/a/33898010/570796^0|2|X|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|C|$G|H]]|$1|I|3|J|5|6|7|X|8|@]|9|@]|C|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Based on <a href="https://stackoverflow.com/a/33898010/570796">multiparameter version by Clément</a>, just without color codes for the text file
<pre class="lang-js prettyprint-override"><code>var fs = require('fs');
var util = require('util');
var logFile = fs.createWriteStream('log.txt', { flags: 'w' });
 // Or 'w' to truncate the file every time the process starts.
var logStdout = process.stdout;

console.log = function () {
 // Storing without color codes
 logFile.write(util.format.apply(null,arguments).replace(/\033\[[0-9;]*m/g,&quot;&quot;) + '\n');
 // Display normally, with colors to Stdout
 logStdout.write(util.format.apply(null, arguments) + '\n');
}
</code></pre>
Note: Answering since I couldn't comment

Can I configure <code>console.log</code> so that the logs are written on a file instead of being printed in the console?

Configure Node.js to log to a file instead of the console

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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是否可以将console.log配置为将日志写入文件，而不是在控制台中打印？

问将Node.js配置为记录到文件，而不是控制台
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问将Node.js配置为记录到文件，而不是控制台
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