javascript es6 class

location index is required. An integer that specifies the location of the Add/remove item, using a negative number to specify the position from the end of the array. Howmany required. The number of items to delete. If set to 0, the item is not deleted. Item1, ..., ItemX optional . Adds a new item to the array. 6. Array Delete element// removes the first element and returns the element value, and the elements in the array are automatically moved forward Arrobj.shift (); Arrobj.splice ()7.

In ES5 we often use the indexof () method to determine whether a string contains another string.Returns the first index value to match, if one exists. If not, returns-1. So, judging whether a string contains another string only needs to be judged if it is-1 on the line. -1 means non-existent.For example:Let str = ' Hello world! ' ; Console.log (Str.indexof (' H ')); // 0 The First index of the presence of "H" in str is 0console.log (str.indexof (' o ')); // 4 The index of the first occurrence

varDifferenceset =NewSet (); the varvalues= This. values (); the for(vari=0;i){94 if(!Otherset.has (Values[i])) { the Differenceset.add (Values[i]); the } the }98 returnDifferenceset; About }; - 101 //determine if it is a subset of Otherset102 This. subset=function(otherset) {103 if( This. Size () >otherset.size ()) {104 return false; the}Else{106 varvalues= This. values ();107

= zero" and the other is "1 = single"using forEach() method Iteration MappingsMapping can also be done byforEach()方法迭代：1 mymap.foreach (function(value, key) {2 console.log (key + "=" + value); 3}, MyMap)4// will display two logs. One is "0 = zero" and the other is "1 = single"mapping the relationship to an array object1 varKvarray = [["Key1", "value1"], ["Key2", "value2"]];2 3 //convert a two-dimensional key-value array object into a mapping relationship using the general constructor of

1 /**2 * "is the accent note (128 keyboard in the upper left corner of ESC)3 * Subordinate: template string4 */5 6Let unit = ' 4 ';7Let keywords = ' UC ';8 9 //step1: Template variable ${variable_name}TenLet URL =' Shell${keywords}${unit} '; One console.log (URL); A - //Old -Let URLs = ' Shell ' + keywords +Unit; the Console.log (URLs); - - - + //Step2: Template Making (more intelligent) -Let view = ` + A at `; - console.log (view); - - //Old -Let views = "; -Conso

successfully } catch (e) { //possible failure (and might accidentally catch the wrong excepti ON) } The weight constitutes this: if (Reflect.defineproperty (obj, name, desc)) { //Success } else { //Failure } The rest of the methods, such as Relect.set, Reflect.deleteproperty, Reflect.preventextensions, reflect.setprototypeof, can be reconstructed; 2: function operation, if you want to determine that an obj has defined or inherited attribute name, in the ES5 this judgment: nam

Personal Summary: Reading this article takes 15 minutes, the article mainly explains the working principle of Babel and typescript, (such as the conversion of ES6 class, is to convert the original ES6 code to ES5 code, 这些代码中包含着类似于 _classCallCheck 和 _createClass这样的函数，而这些函数已经 pre-defined in the standard libraries of Babel and typescript, and then processed). By the

The factory method, constructor, and class in JavaScript This article is reproduced from: Zhongcheng translationTranslator: CheuchenLinks: http://www.zcfy.cc/article/1129Original: https://medium.com/javascript-scene/ Javascript-factory-functions-vs-constructor-functions-vs-classes-2f22ceddf33e#.wby148xu6

We know the code for getting the class name of a JavaScript user-defined class, although JavaScript is an object-based language. However, with its prototype feature, we can fully implement a very sexy OO compiling framework. Here we can look at the articles in the classic Forum 'Basically implement

JavaScript-create your first class library, javascript-class library Through the previous object-oriented and Prototype Learning Section. We know how to create a class, including private attributes and methods of the class, public

How to use JavaScript to define a class, javascript a class My original method is as follows: function Dog(){ this.name = 'hachi';}Dog.prototype = { makeNoise:function(){ alert('wangwangwang'); }}; Later, I saw another complicated and seemingly unnecessary statement: function Dog(){ var privateVariable = 'secret

Add and remove class names based on JavaScript and remove class names using javascript Method 1: Use the className attribute; Method 2: Use the classList API; // Function reg (name) {return new RegExp ('(^ | \ s)' + name + '(\ s + | $) ');} // hasClass addClass removeClass toogleClassvar hasClass, addClass, removeClass

Detailed explanation of the principle of the Javascript class Inheritance Mechanism Currently, JavaScript implementation inheritance is not implemented through the "extend" keyword, but through the constructor function and prototype attributes. First, create an animal class.JS Code VaR animal = function () {// This is the constructor function. This. Name = 'pi

A simple JavaScript class definition example A simple example of JavaScript Public Member definition, Private member definition, and privileged method definition is provided.Java code

Share a common javascript static class and a javascript static class If you don't talk much about it, simply provide the Code. If you know what to do with it, take it directly. Copy codeThe Code is as follows:Util = function (){Return {$: Function (id ){Return document. getElementById (id );},Trim: function (str ){Retu

What is the prototype chain??? The concept of C/c++/java class has been deep in my heart, and suddenly this is not suitable. What's the use?And see the back ES6 grammar, unexpectedly also joined the class?????What the hell? Isn't that a hit on your face?Maybe there's something useful in the back, but I haven't found it yet.A brief explanation of the prototype cha

The popularity of JavaScript has facilitated the development of a very active ecosystem of related technologies, frameworks and libraries. The diversity and dynamism of the entire biosphere has become more and more confusing for many people. What techniques should you know about?where should we spend our time to get the most benefit? What are the technical stacks for the company's recruitment requirements? Which technology has the greatest potential f

JavaScript is a very low entry threshold language, and even a technician who has never had access to JavaScript, can write a simple and useful program code within hours. But if so you're jumping to conclusions: JavaScript is a simple language. Then you are wrong. To write High-performance code, you also need to have the basics of a senior programmer. A Java or

The examples in this article describe the implementation of JavaScript definition classes and classes. Share to everyone for your reference, specific as follows: It has been frequently seen in several groups that a function in a class is asked how to call this. The method that is exposed after the definition. Now send a class to realize the essay. First of all,

/********************************************************************* * JavaScript class Use * Description: * There are many ways of writing JavaScript, but it is not necessary to use the traditional methods, the syntax sugar class * to directly solve, can be simple, it is not complicated. * * 2017-8-25 Shenzhen Longh