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Getting started with ECMAScript 6 (Day07) Continued: [ES6]Day06 - classes and objects in ES6 7.1.1 general In the typical object-oriented language (java), there is the concept of class. Class is the template of object and object is the instance of class. But before ES6, js did not refer to the conce ...

What is ES6 ECMAScript, the abbreviation of ECMAScript, is the standard of JavaScript language officially released in June 2015, officially named ECMAScript 2015 (ES2015). Its goal is to make JavaScript language can be used to write complex large-scale applications and become an enterprise development ...

json What is JSON JSON(JavaScript Object Notation) is a lightweight data exchange format. It is based on ECMAScript A subset of. JSON uses a completely language independent text format, but also uses habits similar to the C language family (including C,C++,C#,Java,JavaScript,Perl,Python Etc.). These features make JSON an ideal data exchange l ...

After more than an hour's tossing, it's strange. It used to be used like this. Why can't you think about it? The problem is that when using the Vue awesome swiper component, it can't automatically rotate and the small dots of the navigator don't display Made a mistake of course! Experience is not knowledge, knowledge is changing ...

The definition method of general function var fn = function(...){ ...... } //For example: var add = function(a,b){ return a+b; } //Or: function fn(...){ ...... } //For example: function add(a,b){ return a+b; } Shorthand of shorthand method Delete the "function" keyword and functi ...

Parameter extension Usually a function is defined, which can pass more parameters than parameters, but the extra parameters will be ignored. function fn(a,b){ console.log(a); console.log(b); } fn(1,2);//Output 1, 2 in sequence fn(1,2,3,4);//Output 1, 2 in turn, and redundant parameters 3, 4 are ignored To ...

Web front end review HTML Tag/Element - Content tag hosts Content CSS Display Box Model render page Display Style sheets are inherited But margin, padding, border, backgroundimage and backgroundColor are not inherited by child elements javaScript - Behavior is responsible for Behavior ECMAScript standard BOM brows ...

The scope of a var declaration variable is limited to the context of its declaration location var x = 0; // x Is a global variable with a value of 0. console.log(typeof z); // undefined，because z It doesn't exist yet. function a() { // When a When called, var y = 2; // y Declared as a function a The variable of the scope is then assign ...

Pass value from parent component to child component It is easy for the parent component to pass values to the child component. When directly referencing the child component in the parent component, the data is bound in the child component and received in the props attribute of the child component. The following is the ...

Why use promise? Solve callback hell fs.readFile(__dirname + '/data/a.txt', (err, data)=>{ if(!err){ console.log(data.toString()); fs.readFile(__dirname + '/data/b.txt', (err, data)=>{ if(!err){ console.log(data.toString()); } ...