node js event loop monitoring

This article describes in detail the relevant information of the HTTP module and event module in Node. js. If you need more information, refer to the http server of Node. js. By using the low-level API of the HTTP module, Node.

registration.1 varStart =NewDate;2SetTimeout (function(){3Console.log (' fn1 ');4}, 20);5SetTimeout (function(){6Console.log (' fn2 ');7}, 30);8SetTimeout (function(){9Console.log (' Another fn2 ');Ten}, 30); OneSetTimeout (function(){ AConsole.log (' Fn3 '); -}, 10); -Console.log (' Start while '); the while(NewDate-start ) {}; -Console.log (' End While ');The above code output is sequentially1 while 2 while 3 Fn3 4 DNS 5 fn2 6 Another fn2Reprinted from alloyteam:http://www.alloyteam.com/20

Node. js EventAll asynchronous I/O operations of node. JS send an event to the event queue when it is finished.Many objects in node. JS Dist

A long time ago, there was a girl named Netscape, who developed a set of JavaScript event-driven mechanisms (that is, event capture)Later, there is a "IE" of the boy, the child is more arrogant, he thought "with what I want to follow your rules", so he created a set of his own rules (event bubbling)Later, there was a matchmaker called the people's, want to set up

A long time ago, there was a girl named Netscape, who developed a set of JavaScript event-driven mechanisms (that is, event capture)Later, there is a "IE" of the boy, the child is more arrogant, he thought "with what I want to follow your rules", so he created a set of his own rules (event bubbling)Later, there was a matchmaker called the people's, want to set up

A long time ago, there was a girl named Netscape, who developed a set of JavaScript event-driven mechanisms (that is, event capture)Later, there is a "IE" of the boy, the child is more arrogant, he thought "with what I want to follow your rules", so he created a set of his own rules (event bubbling)Later, there was a matchmaker called the people's, want to set up

var eventutil={Add handleELEMENT, nodeType, event typesHandler, functionAddhandler:function (Element,type,handler) {if (Element.addeventlistener) {Element.addeventlistener (Type,handler,false);}else if (elemnt.attachevent) {//IE is judgedElement.attachevent (' on ' +type,handler)}else{//element[' on ' +type]+handler;}}，Removehandler:function (Element,type,handler) {Element.removeeventlistener (Type,handler,false);}else if (element.detachevent) {//deta

The previous article said a bit about JS in the timer setTimeout and setinterval implementation principle. Both timers are executed asynchronously, which is part of the process of JS execution.The model that JS itself executes is the event loop.JS will create a loop at start

In JS, if you use for loop event binding, you may encounter a small problem, see the first example below, regardless of which div is clicked, will pop up 3, that is, length.Since this corresponds to the event binding, and does not bind the corresponding I, the value of I is the last value, that is, 3.Example 1Look at t

Brief introductionthe biggest feature of node. JS is the asynchronous I/O and event-driven architecture design. for highly concurrent solutions, the traditional architecture is a multithreaded model that provides a system thread for each business logic module to compensate for the time overhead of synchronous I/O calls through system thread switching.

situation?Now that we know that the function calls the external variable, it forms a closure, and the variables are affected elsewhere, so weNow all you have to do is build a closure that is accessible only to itself, and save the variables that are used only by itself.Building a closure is simple and the code is as follows:Way One:[JavaScript]View PlainCopy var list_obj = document.getelementsbytagname (' Li '); for (var i = 0; I "White-space:pre" > function (i) { //outer function

Modern developers are aiming to create new things on a regular basis and may deliver a new technology every other month or two. Some technologies that are not well derived and managed will, of course, quickly disappear. node. js seems to be very different from these technologies, and since its launch in 2009, its current technology is already quite mature and increasingly popular!

This article mainly introduces JS implementation of sliding touch screen event monitoring method, suitable for mobile phone touch screen sliding event monitoring skills, very practical value, the need for friends can refer to the This paper illustrates the method of

//Descriptionthe Node API version is v0.10.31. Chinese Reference: Http://nodeapi.ucdok.com/#/api/,http://blog.sina.com.cn/oleoneoythis Keweibo main note. Directory Events 0 class:events. Eventemitter Emitter.addlistener (event, listener) Emitter.on (event, listener) emitter.once (event, listener) Emitter.removelist

" +i); } } });mode 3. Introduce jquery, using the on or delegate event bindings (they all have the properties of the event broker)//Delegate Method$ ("ul"). Delegate ("Li", "click",function(){ varIndex = $ ( This). index (); varInfo = $ ( This). html (); Alert (Index+ "----" +info); }); //On method$ ("ul"). On ("Click", "Li",function(){ varIndex = $ ( This). index (); varInfo = $ (

node. JS is now very active, and the relevant eco-community has surpassed Lua (basically the more well-known features are implemented with the Nodejs module).But why do we use node. js? What are the advantages of nodejs compared to the traditional webserver service model?node