arrow function

Global executionFirst, let's look at what it is in the global context:Browser:Console.log (this);Window {speechsynthesis:speechsynthesis, caches:cachestorage, Localstorage:storage, Sessionstorage:storage, Webkitstorageinfo:deprecatedstorageinfo

Original: https://www.cnblogs.com/ys-ys/p/5158510.html--------------------------------------------------------------------------------Thank you for this good article from the Broken Wolf, as well as the authors who wrote these points of knowledge

ES6 extends some of the methods of functions: 1: You can give the function a default parameter function fn (a,b=7) { console.log (a,b) } fn (1) When the FN function is invoked, no arguments are passed to B, but because the parameter is set to

Detailed description of extended instances of new features in ES6, and detailed description of new feature instances in es6 This article describes the function extension of the new features of ES6. We will share this with you for your reference. The

Basic usageES6 allows you to define functions using the arrows ( => ).var f = v + V;The above arrow functions are equivalent to:var function (v) { return v;};If the arrow function does not require arguments or requires more than one argument, a

It is said that JavaScript is a very flexible language, which can also be said that it is a confusing language. It combines functional programming with object-oriented programming, plus dynamic language features that are incredibly powerful (in fact,

First, ECMASCRIPT6 (es2015) ES6 syntaxES6/ES2015, on the basis of ES5 to expand a lot of new features, we want to learn is only part of the ES6 in the common new features, these features in use must be cautious, because some of them JS code in some

From the beginning, the arrows are part of the JavaScript, and in the first JavaScript it is recommended that you wrap the inline script code in an HTML annotation, which prevents browsers that do not support JavaScript from incorrectly dropping

This article for everyone to share about-javascript: Interview frequently appear several easy wrong point, hope to help everyone 1. Preface This time, gold three silver four, many people interview, many people share face questions. In the previous

Block-level scopes ES5 does not have block-level scope, only global scope and function scope, because of this, the scope of the variable is very wide, so a entry function is to create it immediately. This creates the so-called variable ascension.

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One: Props ( attribute)Most components can be customized with various parameters when they are created. These parameters, which are used for customization, are called Props (attributes). props is specified in the parent component and, once specified,

1, the function parameter's default value ES5 cannot directly specify a default value for a function's arguments, only the following workarounds can be used: From the above code you can see that there is a problem, when the passed parameter is 0

This has a very high attendance rate in the daily use of javascript or in the front-end interview process. This undoubtedly illustrates the importance of this. However, this is very flexible, making it hard for many people to understand this

Feature IntroductionThe arrow function is one of the new features of ES6, which provides a new syntax for writing functions for the language JS.function Fun (x, y) {return x+ y;} Console.log (Fun (5,10)); // 15// ES6 var fun6 = (x,

Arrow function (Arrows Functions)As the name says, the arrow function uses arrows (= =) to define the function. The arrow functions behave differently in many places than traditional functions.Arrows function syntax (arrow functions Syntax)There are

1. Arrow functions: If an arrow function does not require a parameter or multiple parameters, a parentheses are used to represent the parameter section. var f = () => 5; var sum = (num1, num2) => num1 + num2; The code block of an arrow function

Module referenceIn ES5, if the CommonJS standard is used, The React package is introduced through require. The code is similar to this:// ES5Var React = require ("react-native ");Var {Image,Text,View,} = React; // reference different React Native

has been to the this point is very vague, find some other people's blog look, and re-read the "You do not know the JavaScript", the feeling is basically to understand, pick some of the key points of the record, some places for me to explain the book

With the support of Google and Firfox and node6.0 for ES6, the finalization of the ES6 syntax has given it more and more attention, especially react projects are written mostly in ES6. It's time to change from ES5 to ES6. , related background