arrow function

Today I'm going to summarize some of the things ES6 does with functions. Combined with my ES5 function features, can let us according to the actual situation, to very good completion of our project requirements. One, ES6 arrow function 1. Arrow

Document. onclick = function () {// This of a common function is temporarily bound during running. That is to say, the function is not running, you absolutely cannot know who this is. // if this function is called by yourself, this is a window. For

ES6 can use the arrow to define a function, note that it is a function, and do not define the class (constructor) in this way.First, the grammar1. Simple function with one parametervar single = a + asingle (' Hello, World ')//' Hello, World '　　2.

No parameter amount arrow functionIf the function does not have arguments, we can say by (), is not some force lattice, see exampleConst FULLNAMES5 = Names.map (() = ' Cool Bos '); Console.log (FULLNAMES5); Cool Bos, cool Bos, cool BOSThere is

Rest parameter and destructuring assignment.Function fun1 (... theargs) {Console.log (theargs.length);}Theargs is an arrayFun1 (); 0FUN1 (5); 1FUN1 (5, 6, 7); 3function f (A, B, ... Theargs) {// ...}function f (... [A, B, C]) {Return a + B + C;}F (1)

First, the grammar1. Simple function with one parameter 12 varsingle = a => asingle(‘hello, world‘) // ‘hello, world‘ 　　2. Need to use the parentheses before the arrows for no parameters 123

//user input number, according to the user's choice to print the stars//just playing the star function.Let Chooseone = line ={Let strspace= ""; Let Strstar= ""; //this layer for loop controls the number of rows of stars for(Let I=1; i) {

Prototype chainExamples are as follows:var arr = [1, 2, 3];Its prototype chain is:arr ----> Array.prototype ----> Object.prototype ----> nullIn the same vein, we create a function:function foo () { return 0;}Its prototype chain is:foo ---->

ES6 can use the arrows to define a function, note that it is a function, and do not define a class (constructor) in this way. => First, the grammar 1. Simple function with one parameter var single = a => a ("Hello, World")//' Hello, World '

The JavaScript arrow function is an easy way to write function expressions introduced in ECMAScript 6. Typically, in JavaScript, you can create functions in two ways: function statements. An expression of the function. You can

In this paper, the operating environment of the demo is Nodejs, reference: let Nodejs support ES6 lexical----Babel installation and use ;Default value of the function:If there are parameters, then use parameters, if there are no parameters, then use

Tip First of all, I know this article is very boring, nothing more than the this in JS, and there have been thousands of articles have written this part of the content;However, I still want to write a about JS in this article, is a summary summed

In js, the context of this is always unpredictable. In many cases, bugs are always confused. In fact, it is okay to know how to execute it in different situations. Global execution First, let's look at what this is in the global environment: First.

Learn how to use this in JavaScript and how to use javascript. Tip First of all, I know this article is boring. It is nothing more than this in js, and thousands of articles have already written this Part;However, I still want to write an article

We often encounter some pits in the callback function:var obj = { name: ‘qiutc‘, foo: function() { console.log(this); }, foo2: function() { console.log(this); setTimeout(this.foo, 1000); } }obj.foo2();Executing this code we will find

In JS, this is the context in which it is directed according to its scope.Global executionIn the global context, let's see what it is:You can see that a Window object is returned.In node, this returns the global object.Summary : It executes the

This is one of the most intriguing features in JavaScript, like the tenses in high school English, such as the passive tense, past tense, present tense, past time, and, no matter how many times you miss, the next time you may be mistaken. This

This can be said to be one of the most intriguing features in javascript, just like the tenses in high school English, such as the passive tense, the past tense, the present tense, and the past tense, no matter how many times you miss it, the next

Executing in the globalLet's see what this is in the global.first, in the browser :Console.log (this); // Window {speechsynthesis:speechsynthesis, caches:cachestorage, Localstorage:storage, Sessionstorage:storage,

To tell you the truth, since the arrow function has been out, there is no need to worry about the this problem, and on the one hand, to simplify the code, the arrow function is loaded force artifact.There are a few points to note in the arrow