Node.jsCoreModules核心模组ThemodulesdoneedtouseNPMinstall
node.js core modules 核心模组 the modules do need to use npm install
these modules installed locally with you install node js
1. path module
load:
var path = require("path")
using:
path.basename(__filename) # pluck out the file name from the path
path.join(*args) join a series of path name with "/"
2. utilie module
var util = require("util)
util.log() have a same result as console.log(), but it has log the time of the code loading time staple
//++++++++++++++
util.inherits(object1, ob2)
help ob1 to inherits all of function in ob2
3. v8
get current memory
var v8 = require("v8")
util.log(v8.getheapstatistics())
4. reading module
ask question to user in termial and saving those answers
var readline = require('readline') var rl = readline.createinterface(process.stdin, process.stout) # readline helps us to control thoes object rl.question(string, function(answer)) # ask question # handle the answer
rl.setprompt('');
in the question() function to repeat the question prompt
5. eventemitter
require('events');
var emitter = new events.eventemitter();
emitter.on('customevent', function(string));
emitter.emit('customevent', string1)
emit will push the second argument into customevent and run it! \