es6 course

Es6 Notes 2 ^_^ array, es6 Notes 2 array1. Array. from () Array. the from method is used to convert two types of objects into real Arrays: array-like objects and iterable objects) (including the data structure Set and Map added by ES6 ). if(1){ let list = document.querySelectorAll('ul.fancy li'); Array.from(list).forEach(function (li) { console.log(li

Es-next:Esnext is similar to traceur, you can use command line to compile files.Install:Install esnext-gHere's how to compile a, a single file, a print it to stdout:Esnext Myfile.jsTo compile many files at once, specify an output directory:Esnext-o build lib/**/*.jsTo enable source maps for these files, add the **--source-maps** flag.But Esnext doesn ' t support as many ES6 features as traceur, so it's not that popular.Es-shimEs-shim is different from

Default Syntax of parameters in ES6 and default Syntax of es6 Parameters Preface In ES6, if the function parameter has no value or is undefined, the default function parameter allows initialization of the initial value to the default value. Let's take a look at the detailed introduction. Syntax function [name]([param1[ = defaultValue1 ][, ..., paramN[ = defaultVa

For this problem in the ES6 arrow function, the es6 arrow function this Brief Introduction: this in Arrow functions points to different functions defined by general functions. this in Arrow functions is defined by this when defining functions, instead of binding when executing a function. (1) In general, the function this points to the execution of the object. When running obj. say (), this points to the ob

Points of attention in es6's learning and deconstruct in es6's Learning Preface This article mainly introduces some things that need to be paid attention to during es6 deconstruct and shares them for your reference. I will not talk about them much below. Let's take a look at the detailed introduction. Be very careful if you want to use a declared variable for dec

Promise of ES6 new features and promise of es6 New Features The promise concept is introduced in the new ES6 to make the callback more elegant. Layer-by-layer nested callback will make javascript less aesthetic and readable. At the same time, javascript also recommends using a chained method to write function calls. So Promise came into being. Promise is the mean

Provide default values when using ES6 Parameter object destructuring, but can also require the Presen Ce of certain properties.function ajax ({type="Get", the URL= Requiredparameter ("URL"), Data={}, Success= Requiredparameter ("Success"), Error= () + ={}, IsAsync=true} ={ }) {Console.log ({}) {json.stringify ({type, URL, data, success, error, IsAsync},NULL,2));} function Requiredparameter (name) {console.log (' parameter missing:"${name}"`);}Try{ajax

New feature 3 of ES6: Generator (Generator) function details, es6 function details This example describes the new feature 3 of ES6: Generator (Generator) function. We will share this with you for your reference. The details are as follows: 1. Introduction ① Understanding: it can be understood as a function's internal state traversal device. Each call changes the

Set container (without parameter value collection) Set(array): Constructor for set container (with parameter value collection) add(value): Adds a value to the Set container object delete(value): Delete value value of Set container object has(value): Determines whether the set container has value values clear(): Emptying the Set container size: equivalent to the length of the array map Container : An unordered key does not repeat multiple key-value of the collection

Deeply understand the use of data deconstruct in ES6, and deeply understand es6 deconstruct Object deconstruct The object deconstruct syntax uses the object literal volume on the left side of the value assignment statement. Let node = {type: true, name: false} // both declare and assign the value of let {type, name} = node; // or declare and assign the value of let type first, name ({type, name} = node); co

, the function body if there are multiple statements, you need to enclose {}, if you need to return the content, you need to add a return. let foo = (x, y) => { console.log(x, y); return x + y; }; console.log(foo(1, 2));Features of the arrow function:1. Introduction2, the arrow function does not have its own this, the arrow function of this is not called when the decision, but at the time of the definition of the object is its this. (meaning: If there is a function in the oute

A JavaScript Proxy allows-intercept operations performed on objects, arrays, or functions like property lookup, the Ignment, invocation, property deletion, and more to add custom behavior. In this lesson we looks at what intercept property lookup with get the "trap", that'll allow us to get items starting From the end of the array with ease.console.clear ()ConstCharacters = [ 'Harry Potter', 'Ron weasly', 'Hermione Granger', 'Nevel Longbottom', 'Lavender Brown', 'Scabbers', 'Pigwidgeon',]

ES6 ----- Learning Series 2 (deconstruct assignment), es6 ----- deconstruct I. Deconstruct the definition of value assignment In simple terms, the assignment = has the same structure on both sides of the number to perform one-to-one assignment. Ii. deconstruct and assignment Classification Array deconstruct assign value object deconstruct assign value string deconstruct assign value Boolean deconstruct assi

is to package the popular JavaScript libraries into gems, such as the Jquery-rails gem. Of course you might think that's nice, unless you find that the JavaScript module you're using doesn't have a corresponding Gems. For example, you want to start using NPMPackaged react components, such as react-bootstrap, or you might want to use JavaScript tools such as JSX and ES6 transpilers (

course, the function declaration and expression declaration is different, this is the same as the nature of the JS function, there is not too much explanation)Well, after the difference between the ES6 module and the CommonJS module, let's talk about the same point:Modules do not repeatThis is a good understanding, whether it is the ES6 module or the CommonJS mo

have data. Of course, why do we export objects, classes, functions, and so on? Now, you can imitate this example to write your own modules.Build As you already know, ES6 does not support your current browser and Node. js. There is only one way, that is, to use a downgrade converter to write ES6 modular code. As I mentioned earlier, I use 6to5, which can precisel

additional operations.Write modules together Let's try to write a module! Our application will not do anything except output logs. Its main purpose is to let you know how modularity works and how to make your existing environment use es6 modular development. Basic directory structure: ├── Gruntfile.js├── package.json└── src ├── app.js ├── modules │ ├── bar.js │ ├── baz.js │ └── foo.js └── sample └── index.html App. JS i

recycled and the additional attributes are not traversed in the for-in clause. Secondly, the type of the cyclic variable is consistent with its type in the array, rather than the string type. These two points are worth choosing for-of instead of forEach () or for-in. of course, some browsers do not support this yet. However, the above Code can be successfully executed in the latest FireFox version and get the expected results. Of

ECMASCRIPT6 has recently entered the RC phase, and as early as in its community discussions, I have been trying to use ES6 to develop the solution. After the launch of Babel, ES6-based development also has a concrete executable solution, both build and debug can be well supported.With ample environment and tools, we are faced with the choice and analysis of many new features of

properties when entered. ES6 can complete the module loading at compile time, the efficiency is higher than COMMONJS module loading mode. Of course, this also leads to the inability to refer to the ES6 module itself, because it is not an object. Static analysis is possible because the ES6 module is loaded at compile t