The beginning of Nodejs

Package Manager NPM

Common command-line options are

1. Search: find the module package in the REPOSITORY;--NPM search Express
2. Install: installs the package using a Package.json file in the repository or local location,--npm install eapress;npm install [email protected];npm install. /abc.tgz
3. Install-g: install a package in a globally accessible location;--npm install-g express;
4. Remove: Delete a module; npm remove Express
5. Pack: encapsulates the module defined in a Package.json file into A. tgz file;--npm pack
6. View: Show details of the MODULE;--NPM View Express
7. Publish: publish the module defined in a Package.json file to the REGISTRY;--NPM publish
8. Unpublish: Cancel the module you have PUBLISHED;--NPM unpublish mymodule

Using the Package.json file

All modules must contain a Package.json file in his root directory. He is a simple JSON file package that defines a module, including its dependencies. The Package.json file contains several instructions that tell the node manager how to handle the Module. For example:

{    "name": "my_module",    "version": "0.1.0",    "description": "a simple Node. js Module ",    " dependencies ": {            " Express ":" latest "            }}

Create a Node. JS module encapsulation

2. Create a project folder Named./censorify. This will be the directory for this Package.
4. Create a file in the file named Censortext.js.

5. 1 varcensoredwords=["sad", "bad", "mad"];2 varcustomcensoredwords=[];3 functioncensor (inStr) {4      for(idxinchCensoredwords) {5Instr=instr.replace (censoredwords[idx], "* * *");6         }7          for(idxinchCustomcensoredwords) {8Instr=instr.replace (customcensoredwords[idx], "* * *");9         }Ten         returninStr; one     } a  -     functionAddcensoredword (word) { - Customcensoredwords.push (word); the     } -     functiongetcensoredwords () { -         returnCensoredwords.concat (customcensoredwords); -     } +  -Exports.censor=censor; +exports.addcensoredword=addcensoredword; aexports.getcensoredwords=getcensoredwords;

6. Create a Package.json file in The./censorify folder.

   1 {  2     "author": "zhouruxian",  3     "name": "censorify",  4     "version": "0.1.1",  5     "description": "hi",  6     "main": " Censortext ",  7     " dependencies ": {},  8     " Engines ": {  9         "node": "*"ten    }

8. In the console navigate to the .../censorify folder to execute

NPM Pack

The NPM pack will generate the Censorify-0.1.1.tgz file in The./censorify folder.

Using the Node. JS wrapper module in a Node. JS program

1. Create a project folder name .../readwords
2. Under the console, go to the folder to perform NPM Install. /censorrify/censorify-0.1.1.tgz
3. Create a file Named../readwords/readwords.js

   1 var censor=require ("censorify"); 2 console.log (censor.getcensoredwords ()); 3 console.log (censor.censor ("Some very sad,badand mad Text.") )); 4 censor.addcensoredword ("gloomy"); 5 console.log (censor.getcensoredwords ()); 6 console.log (censor.censor ("a very gloomy day"));

4. Execute command Node readwords.js

The results show that some strings have been replaced by "* * *".

At the beginning of Nodejs