es6 book

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

Hello everyone, here is "learn the Web series from scratch" and synchronize updates at the following address ... Github:github.com/daotin/web Public number: The top of the Web front Blog Park: http://www.cnblogs.com/lvonve/ csdn:blog.csdn.net/lvonve/ Here I will start with the Web front End 0 Foundation, step-up learning web-related knowledge points, during the period will also share some fun projects. Now let's go to the Web Front end learning Adventure tour! Firs

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

Hello everyone! The previous article has introduced the building folder, as well as loading JS files. Now let's talk about loading CSS, and understanding of BaseURL.1. Understanding of the project structureThe structure of a project is determined by the architecture of the project, and of course it can be smarter, but it doesn't make much sense. Look at my structure below.I used the third-party library (JS), the ES6 Code (test), the compiled ES5 code

, 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

Spring Festival at home Idle Nothing, to see ES6, selected Ruan a peak big "ES6 Standard Primer" This book, understand the new JS specification. Here to do some reading notes. ECMAScript 6 Notice Currently, the newer versions of the major browsers should support ES6, and the Node.js support for

1. Overview Historically, JavaScript has never had a module system to split a large program into interdependent small files, and then assemble them in simple ways. Other languages have this feature, such as Ruby require, Python import, and even CSS have @import, but JavaScript does not support any of this, which is a huge obstacle to developing large, complex projects. Before the ES6, the community developed a number of module loading programs, the m

In view of the recent development of projects with the VUEJS framework, many of them involve the ES6 grammar which is not well understood in order to read the book carefully.Address: http://es6.ruanyifeng.com/#README　　Chapter One: Let, const commands, and block-level scopesES6 adds a declarative keyword for both the Let and the const variables, which greatly rein

ES6 Let (understanding closures) and Const commandsRecently, the process of doing the project, the use of ES6, because few contact before, so the use is not familiar. Therefore purchased the Nanyi Teacher's ES6 standard introduction, here Thanks Nanyi Teacher's book.We know that ECMAScript 6, ES6, is the fifth version

; Console.log (_tmp);}Gee, in the block-level scope, it declares that let is essentially declaring a new variable to dominate its own block-level scope, and you cannot enter my territory outside of the "Same variable" (ES6). Finally, let's get to the bottom of the list. 1. Allowed has block-level scope 2, a let in the block-level scope of the variable promotion 3, not in the same scope (function scope and block-level scope) with let declare the sam

, only to say what they are used for here. The author assumes that the reader is ignorant of these concepts and does not expect readers to have a very deep understanding of object-oriented after reading these articles.The positioning of this series of articles is QuickStart, introducing JavaScript Object-oriented most commonly used things, so that readers can immediately after reading, imitate the inside of the demo write the object-oriented style of code, and so much more to go back to learn t

inheritance chains at the same time. The __proto__ property of the subclass, which represents the inheritance of the constructor, always points to the parent class. The __proto__ property of the subclass prototype property, which represents the inheritance of the method, always points to the prototype property of the parent class. These characteristics are identical to the parasitic combined inheritance of ES5, so the inheritance of class can be regarded as the syntactic sugar (sim