understanding ecmascript 6

At the end of July 2014, another meeting of TC39 finalized some of the last details about the ECMAScript 6 modular syntax. This article provides a complete overview of the ES6 module system. 1. The current JavaScript module system. JavaScript does not currently have built-in methods to support modularity, but the community has created a very good workaround. Two important (unfortunately mutually incompatibl

Simple use of JavaScript class class encapsulation based on ECMAScript 6, ECMAScript 2015 Article source blog.csdn.net/joyous/article/details/79102169 Create a JS file test.js In the following example, we first define a class named Polygon, and then inherit it to create another class named Square. Note that the super () used in the constructor can only be used in

Original article: http://www.nczonline.net/blog/2012/11/06/ecmascript-6-collections-part-3-weakmaps/ WeakMapSimilar to the conventionalMapThey map a value to a unique key, and then they can be used to obtain the corresponding value.WeakMapAndMapThe difference is that its key can only be the object value, not the original value. Although this restriction looks strange, it is exactly this that makesWeakMapIt

a file with the following code:GULP.SRC ("Src/**/*.js"). Pipe (Gulp.dest ("dist")); Read all JS under SRC, write to dist directoryEach operation of the gulp returns a Stream object, and all operations are performed in memory without the need to manipulate the disk, which greatly increases the build speed.8.3.2 Preprocessing tasksIn the previous section, the installation, configuration, and definition and execution of the grunt task are described in gulp. This section describes compiling

Ecmascript 6 and spread OperatorExpand operator. Converts an array to a continuous parameter. Ecmascript 6 and rest parameterVariable parameters. Process variable objective function parameters. Ecmascript 6 and object literal

]+‘和‘+arguments[1]);}funcAdd(1,‘para2‘);In this function, the name parameter is not explicitly given, but the arguments first two values in the object are used, and the printed result is: 传递给函数的两个参数是：1和para2 , so the named parameter is not required. Explicitly write named parameters one is the custom, the second is to provide a visual and programmatic convenience.5. With regard to named parameters, other programming languages such as C require a function signature, that is, function name, number

Refer to Nanyi's book ECMAScript 6 primer, thanks Nandashin! Let and const command let command ES6 has a new let command to declare variables. Its usage is similar to Var, but the declared variable is valid only within the code block where the Let command resides. Basic usage var a = [];for (var010; i++) { function () { console.log(i); };}a[

This article describes ECMAScript 6, which is about to bring us new array manipulation methods and how to apply these new array features to existing browsers. Note: I will use the alternating constructor (constructor) and Class (class) two terms. Class methodThe method owned by the array itself. Array.from (Arraylike, Mapfunc, Thisarg?) The basic function of Array.from () is to convert the two types of

Original address: http://www.moye.me/2014/11/10/ecmascript-6-generator/IntroductionOld listen to people say koa Dafa good, these two days I also rushed to fashion: with N to install node 0.11.12, under a KOA Open Harmony mode test water. In the education of a series of documents and posts, it is probably recognized that: KOA is a new generation of web frameworks dominated by TJ God KOA Middlewa

One of the most reasonable javasscript coding specifications. _ Translate from:Https://github.com/airbnb/javascript Note : This guide assumes that you are using Babel and requires that you use BABEL-PRESET-AIRBNB or a comparable preset plug-in. It also assumes that you are installing shims/polyfills, utility airbnb-browser-shims, or equivalent plug-ins in your application. directory type referencing object array deconstruction String function arrow function class and constructor module iterator

[cagkey] = Cagvalue; }} OB = new Proxy (ob, pro); ob.like = ' man ';The function defined within the set will be triggered automatically when the listener changes, and the 3 values in the parameter list are defined by default, in order: the modified object, the object's key, and the object's value.It is important to note that if you trigger a listener for an element, its original modification process will be blocked (if you do not take this step), so we need to explicitly modify it.The results

It's written in front. In this chapter we talk about several key statements in ECMAScript, such as Switch, for-in, label and so on, deepen our understanding of them. First, from the most common. While and for While and for are common statements, whether in JavaScript or C or in other programming languages. And in programming we are more commonly used for,for is more flexible and simpler, so some people m

Java Note: Part 6 first understanding of data types (part I), part 6 of java # Routine nagging 1 # the recent power outage in the residential area has caused me to doubt my life. From today on, we should be able to get back to the previous pace # Daily nagging 2 # I wrote a blog in the previous article. From today on, I have come to the theory again in two days.

In-depth understanding of PHP kernel (6) function definition, passing parameters and return values, and in-depth understanding of the kernel. In-depth understanding of PHP kernel (6) function definition, passing parameters and return values, and in-depth

all finished. At one glance it does not seem to make sense, and in the case I do not specify, do you eng what the program is going to output? I think it's a little difficult. Of course, we do not advocate the C language confusion code, write some people can not touch the mind courtesy of the code, but through the analysis of these chaotic code, understand the reason, through analysis, layer to solve the confusion code after the mysterious veil, I think this should also be a learning C language

This article mainly introduces my understanding of the JavaScript prototype and closure series (note 6). For more information, see Related reading: About my understanding of the JavaScript prototype and closure series (note 8) about my understanding of the JavaScript prototype and closure series (note 9) What is a clo

"10" instead of "a" } Summarize: The context environment data for global code is as follows: • Generic variables (including function expressions), such as: var a = 10 | ===> declaration (default assignment undefined) • Function declarations, such as functions fn () {} | ===> Assign Value This | ===> Assign Value function body • Parameters | ===> Assign Value Arguments | ===> Assign Value • Scope of values for free variables | ====> Assign Value A popular definition: Before execu

There are six kinds of inheritance modes in JS, including prototype chain, borrowed constructor, combinatorial inheritance, prototype inheritance parasitic inheritance and parasitic combined inheritance. In order to facilitate the understanding of memory, I daydream about a process, a simple description of the 6 model. A long story, let's call it a name Nu wa made people. Creating objects Nu wa One of th

: Create an object? FormatClass Name Object name =Newclass name ();B: How do I use member variables and member methods?Object name. Member VariableThe name of the object. Member method ()(6) Case:A: Definition and use of student classB: Definition and use of mobile phone class(7) Memory diagramA: Memory diagram of an objectB: Memory diagram of two objectsC: Memory diagram of three objects(8) Development, design, and characteristics of Java programsA:

Visual Studio teacher to verify to us:See, there are these properties such as call, length, and so on.Then why are there hasOwnProperty? -That's the way Function.prototype inherits from Object.prototype. In doubt, see if the previous section will instanceof the big picture and see if function.prototype.__proto__ is pointing to Object.prototype.Prototype, prototype chain, does everybody understand?---------------------------------------------------------------------------This article has been up