See node. js clearly (ii)

Compare buffers
Copy buffer

Routing means that we have different ways of dealing with different URLs, such as handling/start business logic and dealing with/upload modules, and logic is
is inconsistent.

Node. JS Module System:
http://www.shouce.ren/api/view/a/3470

Code area:

/** * Compare buffers * Buf1.compare (BUF2);*/varBuffer1 =NewBuffer (' ABC ');varBuffer2 =NewBuffer (' ABCD ');varresult =Buffer1.compare (buffer2); Console.log (result);if(Result < 0) {Console.log (Buffer1+ ' comes before ' +buffer2);}Else if(Result = = 0) {Console.log (Buffer1+ ' is same as ' +buffer2);}Else if(Result > 0) {Console.log (Buffer1+ ' comes after ' +buffer2);}/** * Copy buffer*/varBuffer1 =NewBuffer (' ABC ');varBuffer2 =NewBuffer (3); buffer1.copy (buffer2); Console.log (' Buffer2: ' + buffer2.tostring ());//BUFFER2:ABC//Buffer ClippingvarBuffer1 =NewBuffer (' Runoob ');varBuffer2 = Buffer1.slice (0, 2); Console.log (' Buffer2 content: ' +buffer2);//buffer length//Buf.lengthvarBuffer =NewBuffer (' www.baidu.com '); Console.log (' Buffer length: ' + buffer.length ';//length of buffer:/** node. js Stream (Stream)*///reading data from the stream//Introducing File SystemsvarFS = require (' FS ');vardata = ';//to create a readable streamvarReadstream = Fs.createreadstream (' input.txt '));//Set EncodingReadstream.setencoding (' UTF8 ');//Handling Flow EventsReadstream.on (' Data ',function(chunk) {data+=Chunk;}); Readstream.on (' End ',function() {console.log (data);}); Readstream.on (' Error ',function(Err) {console.log (err.stack);}); Console.log (' Program execution is complete! ‘);//Write Stream//introducing File System modulesvarFS = require (' FS ');vardata = ' This is Baidu's website: www.baidu.com ';varCreateFile = ' Output.txt ';varWritestream =Fs.createwritestream (createFile);//writing data using UTF8 encodingWritestream.write (data, ' UTF8 '));//Mark file Endwritestream.end ();//File Write completeWritestream.on (' Finish ',function() {Console.log (' Write Complete ');});//Error PromptWritestream.on (' Error ',function(Err) {console.log (err.stack);}); Console.log (' Program execution is complete! ‘);//Pipe Flow//get data from one stream and pass it to another stream//read the contents of a file and write the contents to another content//Introducing File SystemsvarFS = require (' FS ');//Create a readable streamvarReadstream = Fs.createreadstream (' input.txt '));//Create a writable streamvarWritestream = Fs.createwritestream (' output.txt '));//Pipe Read and write operationsreadstream.pipe (Writestream); Console.log (' Program execution is complete! ‘);//Chained Flow//connect the output stream to another stream and create multiple flow action chains//introducing File System modulesvarFS = require (' FS ');//introducing a compression modulevarZlib = require (' zlib '));//to create a readable streamFs.createreadstream (' Input.txt '). Pipe (Zlib.creategzip ()). Pipe (Fs.createwritestream (' Input.txt.gz ')); Console.log (' File compression complete ');//Creategunzip ()//chained stream Decompression filevarFS = require ("FS");varZlib = require (' zlib '));//Unzip the input.txt.gz file to Input.txtFs.createreadstream (' input.txt.gz '). Pipe (Zlib.creategunzip ()). Pipe (Fs.createwritestream (' Input.txt ')); Console.log (The file is unzipped. ");//node. JS Module System//node. js functionfunctionSay (Word) {console.log (word);}functionexecute (F, v) {f (v);} Execute (say,' Some words ');//Incoming anonymous functionExecutefunction(Word) {console.log (word);},' Some words ');//function passing is how to get the HTTP server to workvarHTTP = require (' http '); Http.createserver (ONrequest). Listen (8080);functiononrequest (Request, Response) {Response.writehead ($, {' Content-type ': ' Text/plain '}); Response.Write (' Some words '); Response.End ();}//node. JS Routing//requires URL and QueryString modulevarHTTP = require (' http ');varurl = require (' URL ')); Http.createserver (ONrequest). Listen (8080);functiononrequest (Request, Response) {Response.writehead ($, {' Content-type ': ' Text/plain '}); Response.Write (' Some words '); Response.End ();}//node. JS Global Object Globals//__filename: The file name of the script that is currently executingConsole.log (__filename);//E:\demo\node\demo01.js//the directory where the current execution script residesConsole.log (__dirname);//E:\demo\node//global variable process, which is the property of the global object//Process is an object that describes the state of the current node. JS ProcessProcess.on (' exit ',function(code) {SetTimeout (function() {Console.log (' The code will never execute '); }, 0); Console.log (' Exit code: ' + code ';//0}); Console.log (' End of program execution ');//output to TerminalProcess.stdout.write (' Some words ' + ' \ n ');//read by parameterProcess.argv.forEach (function(val, index, array) {Console.log (index+ ': ' +val);});/** * 0:d:\node_install\node.exe * 1:e:\demo\node\demo01*///Get absolute pathConsole.log (Process.execpath);//D:\node_install\node.exe//Get platform InformationConsole.log (Process.platform);//Win32//Output current directoryConsole.log (PROCESS.CWD ());//E:\demo\node//Output Current VersionConsole.log (process.version);//Output Memory UsageConsole.log (Process.memoryusage ());

See node. js clearly (ii)