javascript understanding weird parts

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In-depth understanding of synchronization and Asynchronization mechanisms in JavaScript programming

This article mainly introduces a deep understanding of the synchronous and asynchronous mechanisms in JavaScript programming, not only AJAX has penetrated into every corner, Node. the popularity of js has also attracted special attention in asynchronous programming of JavaScript. One of the advantages of JavaScript is

Javascript-this Understanding

the parameters are different, and two methods can change the object of this binding, as followsCall (Obj,param1,param2 ...) ;apply (obj,[]/*params[] parameter array */);functionSubway (name) { This. name=name; This. speed=0; This. run=function(speed) { This. speed=Speed ; }; } vars=NewSubway (' line Line 1 ')); S.run (300); Console.log (' One line speed: ', s.speed);//300;this binding to the newly generated object s vars1=NewSubway (' line Line 2 ')); S.run.apply (s1,[100]); Console.log (' Li

Understanding of JavaScript closures

Closures are a unique concept in JavaScript, and for beginners, closures are a particularly abstract concept, especially the definition given by the ECMA specification, and it is difficult to understand it from the definition without actual combat experience. Therefore, this article does not describe the concept of closures in large space.1 explorationOne of the first things I would do when contacting a new technology is to look for its demo code. For

Preliminary understanding of JavaScript

Learning Goals>> Understanding JavaScript Components>> three major components>> Understanding JavaScript parsing mechanism>> sequential parsing, edge parsing edge execution>> How to use JavaScript>> ————————————————————————————What is Ja

A preliminary understanding of JavaScript

grasp oneself, is always have a clear heart, have a clear feelings. Hey, We in 2014-2015 of the span, we rest for four days, today back to the learning stage, knocking up the keyboard suddenly a little strange, think of time really good fast, here we have been over the rhythm of two months, here to learn the basic knowledge of C #, SQL Server statements and HTML,CSS, and so on, the progress of learning can keep up with the rhythm, but the grasp of the situation is still need to review, so it is

Understanding JavaScript Asynchronous Programming _javascript skills

code than callback functions, event sniffing, publish/subscribe solutions. About promises can refer to: JS Magic Hall: Analysis of source code understanding promises/a norms. Viii. ES6 support for asynchronous This is a new technology that becomes part of the 2015 ECMAScript (ES6) standard. The specification of the technology is complete, but the implementation is different in different browsers, and the support in the browser is as follows.

In-depth understanding of the JavaScript series (27): Design Pattern Builder mode

that the "machining process" of the builder pattern is exposed, which makes the builder model more flexible, and the builder mode decouples the assembly process and creates the specific parts, so we don't have to care about how each part is assembled. Reference: http://www.cnblogs.com/feipeng/archive/2007/03/12/671932.htmlsynchronization and recommendation this article has been synchronized to the directory index: in-depth

Deep understanding of JavaScript Series (47): Object creation Mode (previous) _ Basics

= YAHOO.util.Event, dom = YAHOO.util.dom; Local variables event and Dom are used in the code behind other functions}; Mode 3: Private properties and Private methods JavaScript This book does not provide a specific syntax to support private and private methods, but we can do this by closing the code as follows: Copy Code code as follows: function Gadget () { Private objects var name = ' IPod '; Public functions This.getna

JavaScript box Model Size Deep Understanding _ Basics

Concept From Wikipedia: According to CSS1, which was published in 1996 by the World Wide Web Consortium and revised in 1999, when any block-level element's width or height is explicitly specified, it should only determine the width or height of the visible element itself (the content area), and padding, Border and margin are subsequently applied. Internet Explorer includes content, internal margins (padding), and borders (border) all within a specified width or height in "

In-depth understanding of the JavaScript series (47): Object creation mode (previous)

methodsJavaScript does not provide a specific syntax to support private properties and private methods, but we can implement them by closures, as follows:functionGadget () {//Private Objects varname = ' IPod '; //Public Functions This. GetName =function () { returnname; };}varToy =NewGadget ();//name not defined, is privateConsole.log (Toy.name);//undefined//Public method Access nameConsole.log (Toy.getname ());//"IPod"varMyObj//assigning values to myobj by self-executing function

A simple understanding of JavaScript's closure concept __java

Original source: https://my.oschina.net/ym1983/blog/829314 Closures are an important concept in JavaScript, and for beginners, closures are a particularly abstract concept, especially the definition given by the ECMA specification, and it is difficult to understand it by definition without actual combat experience. Therefore, this article will not be a large description of the concept of closure, directly on dry goods, so that you learn to shut down

javascript--new understanding of the This pointer

All along, the understanding of this is only available, will be used, but not to delve into its essence.This time, through "JavaScript The Good Parts", made a deep understanding.Let's take a look at this one here. When we declare a function, each function, in addition to the parameters (formal parameter) of the definition, will have an additional two parame

In-depth understanding of the JavaScript series (39): Design mode adapter mode

combinations, while purely using an adapter is not possible. The proxy mode defines a proxy for another object without changing its interface. Reference: https://github.com/tcorral/design-patterns-in-javascript/blob/master/adapter/index.htmlsynchronization and recommendation this article has been synchronized to the directory index: in-depth understanding of JavaScript

In-depth understanding of the JavaScript series (36): The mediator pattern of design patterns

communicate between modules, which is multi-directional, but the appearance pattern simply defines a simple interface for a module or system without adding additional functionality. The concept of other modules and appearance patterns in the system is not directly related and can be considered as unidirectional. The complete example gives a complete example:Summary broker mode is generally applied to a set of objects are well-defined but in a complex way to communicate in the situation, general

JavaScript learning First, JS preliminary understanding

1. Introduction to JavaScript:*javascript is an object-and event-driven language that is primarily used by clients.--based on the object:* * Provides a number of objects that can be used directly.--Event-driven:* * HTML-made Web pages are static effects, and JavaScript does dynamic effects.--Client:Mainly refers to the browser.Features of *js:(1) Interactivity:--

Deep understanding of JavaScript built-in Functions _ Basics

" + TestDate + "and 1/1/70"; return (s); } (one) setdate function: Set the date of the "Day" section, the value is 0~31. sethours function: The "hour" section of the set date, and the value is 0~23. (setminutes function: The "Minutes" section of the set date, and the value is 0~59.) setmonth function: The "month" section of the set date, and the value is 0~11. Of these, 0 said January, ..., 11 means December. setseconds function: The "Seconds" section of the set date, and the value

New understanding of this pointer in JavaScript sharing _javascript tips

All along, the understanding of this is only available, it can be used, but it does not delve into its essence. This time, through the "JavaScript The Good Parts", made a profound understanding. (All debugging can be seen in the console, browser F12 key) Let's take a look at this here. When we declare a function, eac

In-depth understanding of JavaScript design Patterns

system.Behavioral patterns include: iteration mode, Mediator mode, observer pattern, and visitor pattern.Below, we will deepen our understanding of design patterns by introducing each of the common design patterns separately.Constructor modeA constructor is a special function that initializes an object when the memory of the new object is allocated. The object constructor is used to create a special type of object, first it is intended to be used by

A vivid and detailed explanation of the bubbling and capturing of JavaScript, packet Understanding (RPM)

Foreword: Although proficient in jquery, but not very familiar with its prototype JavaScript, recently encountered some difficulties in learning JavaScript, such as bubbling and capturing, many times mentioned, but do not know exactly where to apply. Find some good articles for your doubts and share them here.Quirksmode a series of articles are good, easy to understand, this article is just a series of one,

In-depth understanding of JavaScript var variables and closures

Today I accidentally saw a Nanyi alumni writing about the ES6 new feature let. Let's appearance is to compensate for the lack of var. Thus, write down this blog to revisit the cliché of javascript closures and its scope of criticism.The concept of closures I will not say, many of the books are explained and interpreted, that is, inside a function can access the outside of the function context. Today's focus is on the following VAR variable. Because in

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