app engine node js

In the "Getting Started with node. JS Development--express Installation and use" We used to create a helloexpress website using Express generator, which generated the basic directory structure, templates, stylesheet, Routers and so on. Although it is just a simple HelloWorld class of small things, but it contains a lot of content, in order to better understand the use of the Jade template

First, create an applicationIf we use PHP to write back-end code, we need an Apache or Nginx http server, with MOD_PHP5 modules and php-cgi. From this perspective, the entire "Receive HTTP request and provide WEB page" requirement does not need PHP to handle at all.But for node. JS, the concept is completely different. When using node.

First, block module multiplexingDefine blocks that need to be reused with blockBlock followed by the name of the module, referenced once the block content will be reused oncePost-compilation results:II, inheritance template (extends)In the actual development, the site's head, the tail is generally common, we can through the Jade template inheritance (extends) function, the public part of the abstraction, and then let the different pages inherit these public parts, and inherited it can also be re

The powerful mixinMixin functions similar to function, can achieve the effect of module multiplexingMixin Show: Defines a function similar to the functions of the name is show, inside is his content+show: Call Show, execute the contents once per callPost-compilation results:Mixin can also pass parametersPost-compilation results:Mixin support for nested callsPost-compilation results:Mixin Support Delivery ModulePost-compilation results:Mixin can also pass propertiesPost-compilation results:Mixin

Installing the node. JS Environment sudo Install Nodejs sudo Install NPMFor node_module that depend on different environments, you can regenerate them using the following command RM -InstallIf you do not want to use the system's own node. js, you can use NVMCurl https:///raw.githubusercontent.com/creationix/nvm/v0.16.1

8. Using the standard V8 methodSome operations on the collection, such as Map,reduce, and forEach do not necessarily support all browsers. Some browser compatibility issues can be resolved through the foreground library. But for node. js, you know exactly what Google's V8 JavaScript engine supports. T

1. Create a new directory src, and enter the SRC directorymkdir Src[[email protected] documents]$ CD src/2. Create Package.json and Index.js files with the following contents:Package.json[Email protected] documents]$mkdirSrc[[email protected] documents]$ CD src/[email protected] src]$CatPackage.json {"name":"Docker-centos-hello", "Private":true, "version":"0.0.1", "Description":"node. JS Hello World

CMDFirst enter SERVERCD server//and then under node run the Bin folder under the WWW file node bin/wwwOpen the browser, enter localhost:3000, see, it means that the express service started successfully.4) Replace the Jade engine with HTMLNote that under the View folder, there are three. Jade type files, express using the Jade

Template engine is a tool that generates HTML from a page template according to certain rules.Problem with template engine:(1) The page function logic is coupled with the page layout style, and the website becomes more and more difficult to maintain after the large scale.(2) The complexity of the grammar, for non-technical web designers, the threshold is higher, difficult to learn.(3) The function is too co

() {Console.log ("MongoDB connected fail.");}); Mongoose.connection.on ("Disconnected",function() {Console.log ("MongoDB connected disconnected.");}); Router.get ("/",function(req,res,next) {//res.send (' hello,goods list. ')Stations.find ({},function(err,doc) {if(Err) {Res.json ({status:' 1 ', msg:err.message}); }Else{Res.json ({status:' 0 ', msg:‘‘, result:{count:doc.length, List:doc} })}); module.exports= Router;New models folder under Server folder, new Stations.js file under Modelsvar mongo

' {"A": "Avalue", "B": "Bvalue"}'3. Delete IndexCurl-xdelete ' http://Localhost:9200/{index}/{type}/{id} '4. Set mappingCurl-xput http://localhost:9200/{index}/{type}/_mapping-d ' { "{type}" : { " Properties " : { " date " : { " type ":" Long " }, " name " : { "Type": "string", "index": "Not_analyzed" }, "status" : { " Type ":" "Integer" } ,"type" : {"type": "Integer" }} } '5. Get mappingCurl-xget http://localho