Node. js: hello world

Dom framework cannot be released as scheduled because it runs to another city and has no computers. In this period, the most urgent need was to seek a super lightweight backend to build up my framework, so I reached out to the legendary Server-Side Javascrpt. Backend JS is undoubtedly the node. js of Ryan Dahl, and jaxer developed by the aptana IDE provider.

First download node. js, decompress it to the E disk, change it to node, then Enter cmd in the menu, and use the cd command to switch to the decompressed directory of nodejs:

Example 1: hello world.

Create a hello. js file in the node directory, and then enter:

 
 

  
  
var sys = require("sys");  
  
  
sys.puts("Hello world"); 
 
 

Then, enter the node hello. js command in the nameboard to view the output result Hello world.

Example 2: hello world2.

Okay. This time we try to output hello world from the browser. Create http. js in the node directory and enter:

 
 

  
  
var sys = require("sys"),  
  
  
    http = require("http");  
  
  
http.createServer(function(request, response) {  
  
  
    response.sendHeader(200, {"Content-Type": "text/html"});  
  
  
    response.write("Hello World!");  
  
  
    response.close();  
  
  
}).listen(8080);  
  
  
sys.puts("Server running at http://localhost:8080/");  
 
 

Then, enter the command node http. js in the naming stage, and enter http: // localhost: 8080/in the browser/

Example 3: hello world2.

Node. js provides a Buffer class for converting strings of different encodings. Currently, three types are supported: 'ascii ', 'utf8', and 'binary '. For details, see here.

 
 

  
  
var Buffer = require('buffer').Buffer,  
  
  
buf = new Buffer(256),  
  
  
len = buf.write('\u00bd + \u00bc = \u00be', 0);  
  
  
console.log(len + " bytes: " + buf.toString('utf8', 0, len)); 
 
 

Example 4: hello world3.

 
 

  
  
// Synopsis. js
  
  
// Synopsis abstract, synopsis, outline
  
  
Var http = require ('http ');
  
  

  
  
Http. createServer (function (request, response ){
  
  
Response. writeHead (200, {'content-type': 'text/plain '});
  
  
Response. end ('Hello World \ n ');
  
  
}). Listen (8124 );
  
  

  
  
Console. log ('server running at http: // 127.0.0.1: 8124 /');
 
 

Front-end address bar: http: // localhost: 8124/

Source: http://www.cnblogs.com/rubylouvre/