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Node.jsCoreModules核心模组ThemodulesdoneedtouseNPMinstall

2019年01月16日  | 移动技术网IT编程  | 我要评论

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! \

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