node js deep learning

download the file after useJSON () and JSONP ()app.get(‘/json‘,function(req,res){ res.json({name:"devil",sex:"男",body:"strong"});});Forces the conversion of a JS object to a JSON data format sent to the client, which supports JSONP, the same effect.Redirect ()app.get(‘/baidu‘,function(req,res){ res.redirect(‘http://www.baidu.com‘);});Redirect to another pageSend ()app.get(‘/send‘,function(req,res){ res.send({some:‘json‘});});Send is a very c

); } else { callback (pathname);}} );} function Printdir (argv) {Travel (argv[0],function (pathname) { console.log (pathname); }); Printdir (Process.argv.slice (2));The structure of the file is:Testtraveldir/└──fathers ├──childs │ ├──child01.txt │ └──child02.txt └──father01.txt 2 Directories, 3 filesOf the directory, the result of the traversal is:Asynchronous traversalSlightlyCharacter encodingSlightly--------------------

Child_process is a more important module for node, which enables the creation of multi-threading to take advantage of multicore CPUs.This module provides four functions for creating child processes.Spawn, exec, execfile, fork.Spawn is the most primitive function to create a subprocess, and the remaining three is a different encapsulation of the function.Spawn does not support callback functions.Both exec and execfile support callback functions. The di

JS Create a classThen instantiate it in another program using this class1. Create a user class--------------User.js--------------function User (id,name,age) {This.id=id;This.name=name;This.age=age;This.enter=function () {Console.log ("Access to the Library");}}Module.exports = User;2. Call----------------------N3_modalcall.js-------------var http = require (' http ');var User = require ('./models/user ');Http.createserver (function (request, response)

Js deep learning-code reuse of callback Functions In js, a code block is often used repeatedly in multiple places. This method is not conducive to code optimization, and it is also troublesome for personnel maintenance in the future, if the reuse code block needs to be modified in the later stage, only one of them wil

Js deep learning notes (1)Js is a simple introduction. new Foo (): 1. the prototype of the object directs to the prototype attribute of the Foo constructor. The advantage is that if the object does not exist when accessing the property of the object, the prototype attribute value of Foo will be searched based on the pr

A file is a moduleExports public interfaceCreate Exports.jsTwo common interfaces available externally: Set value, squarevar i;exports.set = function (num) {//Set value i=num; Console.log ("Seti to" +i); Exports.square = function () {//squared and output I=math.pow (i,2); Console.log ("i^2=" +i);Require Get External interfaceCreate Require.jsvar square =require ("./exports");//Load Module Square.set (5); Square.square ();Run effectAfter

Recall that I wrote node. js and MongoDB Blog, are the Novice tutorial there is the knowledge, so I intend not to write, those are the foundation, in the project development, I found that there is no basis for the foundation, these basic can learn quickly, and then learn the project development processHere are links to two tutorials:https://www.runoob.com/nodejs/nodejs-tutorial.html

In JS often back to a code block in multiple places reuse, this practice is not conducive to the optimization of the code, while the maintenance of the latter is also a trouble, if the post-personnel need to modify the reuse of code blocks, often will appear only modify one of them and cause problems, in fact, processing is very simple.Extract the reusable code block to write a function separately. It's OK to call this function directly elsewhere.For

Client-clients, commonly referred to as browsers, can request data from the server via the HTTP protocol. Server -a server-side, generally referred to as the Web servers, can receive client requests and send response data to the client. Business-service layer, which handles applications through Web servers, such as interacting with databases, logical operations, calling external programs, and so on. Data-the database layer, which is typically made up of databases.

starting position of the file read, and if the value of position is NULL, it is read from the position of the current file pointer.Callback-callback function, there are three parameters err, Bytesread, Buffer,err is the error message, Bytesread represents the number of bytes read, and buffer is the cache object.7. Close the file:Fs.close (FD, callback)This callback finally has no parameter!!!8. Interception of documents:Fs.ftruncate (FD, Len, callback)The parameters use the following instructio

an anonymous function.In JavaScript, a function can be a parameter to another function, we can define a function first, then pass it, or we can define the function directly where the parameter is passed.function passing is how to get the HTTP server to workWith this knowledge, let's take a look at our simple and not simple HTTP server:varHTTP = require ("http");Http.createserver (function(Request, response) {Response.writehead ($, {"Content-type": "Text/plain"});Response.Write ("Hello World");

First, Release NotesGo to node. JS Official website https://nodejs.org/en/download/Click on "All download Options" above to enter the address of all download lists: https://nodejs.org/dist/0. It is joyent Company maintenance. Progress is slow. but stable.4.5.* are maintained by netizens. Relative progress is fast, increasing and many new features.Even start with the stable version, the odd start of the deve

Description (2017-5-2-10:27:03):1. Need to install node,http://nodejs.cn/download/2. After installation, enter node-v in cmd to view the version.3. Code Foo.js:Attention:(1) Http.createserver two parameters, Req.url instead of Res.url, finally must res.end ()!(2) Server.listen is not listener. 3000 is the port, name it casually. The following is the routing address of their own computer, CMD in the Ipconfig

"]==data["id"]) {Con[i]=data; Flag=true; Break; }} result.msg= "The modification failed, the customer needs to be modified does not exist"; if(flag) {Fs.writefilesync (Custompath,json.stringify (con),"Utf-8"); Result={code:0, msg:"Modified successfully"}} res.writehead (200,{' content-type ': ' Application/json;charset=utf-8; '}); Res.end (json.stringify (result)); }) return; } //If the requested address is not one of these, the prompt does not existRes.writehead (404,{' conten

1.node.js is essentially a JavaScript execution environment that, like Chrome's console command line, can write JS code directly inside and executeThe two difference is that there are some of their own unique global variables, such as chrome can have window and document, and node. JS has a process and other global variablesThe difference between 2.exports and mod

first, and the instance is the object.The second Kindvar clock = new Object (); clock.hour=12; clock.minute=10; Clock.showhour=function () {alert (clock.hour);}; Clock.showhour ();//CallThis is better understood by first creating an instance of object and then adding properties and methods to the instance.So create the type first, and the instance is the object.Third Kindfunction Clock (hour,minute,second) { this.hour = hour; This.minute = minute; This.second = second; This.showtime = funct

Today, I practiced a nodejs, which is very light and fast!Websitehttp://nodejs.org/download/DownloadWindows7 64-bit download MSI installation package:Http://nodejs.org/dist/v0.12.0/x64/node-v0.12.0-x64.msiInstallationJust go crazy.Mounting to F-plate F:\nodejsExecute Ordinary JSNew in the installation directoryHello.jsConsole.log ("Hello world!");Go to the installation directory to execute Nodehello.js, after running the following effect:Start the ser

directory: Use Fs.mkdir;3, write the file, and write the content, including a connection;A: Start without files, create files and write content; fs.writefile;Fs.writefile ("File path and name created", "Write File Contents", () =>{})B: Start with file, write content only;Fs.appendfile ("Write File path and name", "Write File Contents", () =>{})4. Read file: Take advantage of Fs.readfile ("path and name of file", "Utf-8", () =>{});If you do not write the second, you will see data returned as buf

', () ={assert.strictequal (sum (), 3); }) It (' Sum (should) return 6 ', () ={assert.strictequal (sum ((6),); }) })})First Mocha must have an assertion module. The assert in the figure is from node. js. Simply assert a class that does some comparison operation on the incoming data.The two parameters of the describe function are the description of the test and the code area of the test. Describe can nes