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javascript.info

Website beoordeling javascript.info

 Gegenereerd op Juni 04 2021 16:32 PM

Oude statistieken? UPDATE !


De score is 57/100

SEO Content
Title

The Modern JavaScript Tutorial



Lengte : 30

Perfect, uw title tag bevat tussen de 10 en 70 karakters.
Description

Modern JavaScript Tutorial: simple, but detailed explanations with examples and tasks, including: closures, document and events, object oriented programming and more.



Lengte : 166

Let op, uw meta description zou tussen de 70 en 160 karakters (spaces included) moeten bevatten.
Keywords



Erg slecht. We hebben geen meta keywords gevonden in uw website. Gebruik deze gratis online meta tags generator om keywords te genereren.
Og Meta Properties Goed, uw page maakt gebruik van Og Properties.
Property Content
title The Modern JavaScript Tutorial
image https://javascript.info/img/site_preview_en_1200x630.png
image:type image/png
image:width 1200
image:height 630
Headings
H1 H2 H3 H4 H5 H6
1 5 0 0 0 0
  • [H1] The Modern JavaScript Tutorial
  • [H2] Table of contents
  • [H2] The JavaScript language
  • [H2] Browser: Document, Events, Interfaces
  • [H2] Additional articles
  • [H2] Comments
Afbeeldingen We vonden 2 afbeeldingen in de pagina.

2 alt attributen ontbreken. Voeg alternatieve text toe zodat zoekmachines beter kunnen beoordelen wat het onderwerp van de afbeeldingen is.
Text/HTML Ratio Ratio : 15%

Goed, De ratio van text tot HTML code hoger dan 15, maar lager dan 25 procent.
Flash Perfect, geen Flash content gevonden in uw website.
Iframe Perfect, er zijn geen Iframes in uw website aangetroffen.

Herschreven URL Perfect. Uw links zien er vriendelijk uit!
Underscores in de URLs Perfect! Geen underscores gevonden in uw URLs.
In-page links We vonden een totaal van 216 links inclusie 2 link(s) naar bestanden



Ankertekst Type samenstelling
translate the tutorial Extern doFollow
translate the tutorial Extern doFollow
Help to translate Intern doFollow
- Extern noFollow
- Extern noFollow
15th March 2021 Extern doFollow
An introduction Intern doFollow
An Introduction to JavaScript Intern doFollow
Manuals and specifications Intern doFollow
Code editors Intern doFollow
Developer console Intern doFollow
JavaScript Fundamentals Intern doFollow
Hello, world! Intern doFollow
Code structure Intern doFollow
The modern mode, "use strict" Intern doFollow
Variables Intern doFollow
Data types Intern doFollow
Interaction: alert, prompt, confirm Intern doFollow
Type Conversions Intern doFollow
Basic operators, maths Intern doFollow
Comparisons Intern doFollow
Conditional branching: if, '?' Intern doFollow
Logical operators Intern doFollow
Nullish coalescing operator '??' Intern doFollow
Loops: while and for Intern doFollow
The "switch" statement Intern doFollow
Functions Intern doFollow
Function expressions Intern doFollow
Arrow functions, the basics Intern doFollow
JavaScript specials Intern doFollow
More… Intern doFollow
Code quality Intern doFollow
Debugging in Chrome Intern doFollow
Coding Style Intern doFollow
Comments Intern doFollow
Ninja code Intern doFollow
Automated testing with Mocha Intern doFollow
Polyfills and transpilers Intern doFollow
Objects: the basics Intern doFollow
Objects Intern doFollow
Object references and copying Intern doFollow
Garbage collection Intern doFollow
Object methods, "this" Intern doFollow
Constructor, operator "new" Intern doFollow
Optional chaining '?.' Intern doFollow
Symbol type Intern doFollow
Object to primitive conversion Intern doFollow
Data types Intern doFollow
Methods of primitives Intern doFollow
Numbers Intern doFollow
Strings Intern doFollow
Arrays Intern doFollow
Array methods Intern doFollow
Iterables Intern doFollow
Map and Set Intern doFollow
WeakMap and WeakSet Intern doFollow
Object.keys, values, entries Intern doFollow
Destructuring assignment Intern doFollow
Date and time Intern doFollow
JSON methods, toJSON Intern doFollow
Advanced working with functions Intern doFollow
Recursion and stack Intern doFollow
Rest parameters and spread syntax Intern doFollow
Variable scope, closure Intern doFollow
The old "var" Intern doFollow
Global object Intern doFollow
Function object, NFE Intern doFollow
The "new Function" syntax Intern doFollow
Scheduling: setTimeout and setInterval Intern doFollow
Decorators and forwarding, call/apply Intern doFollow
Function binding Intern doFollow
Arrow functions revisited Intern doFollow
Object properties configuration Intern doFollow
Property flags and descriptors Intern doFollow
Property getters and setters Intern doFollow
Prototypes, inheritance Intern doFollow
Prototypal inheritance Intern doFollow
F.prototype Intern doFollow
Native prototypes Intern doFollow
Prototype methods, objects without __proto__ Intern doFollow
Classes Intern doFollow
Class basic syntax Intern doFollow
Class inheritance Intern doFollow
Static properties and methods Intern doFollow
Private and protected properties and methods Intern doFollow
Extending built-in classes Intern doFollow
Class checking: "instanceof" Intern doFollow
Mixins Intern doFollow
Error handling Intern doFollow
Error handling, "try...catch" Intern doFollow
Custom errors, extending Error Intern doFollow
Promises, async/await Intern doFollow
Introduction: callbacks Intern doFollow
Promise Intern doFollow
Promises chaining Intern doFollow
Error handling with promises Intern doFollow
Promise API Intern doFollow
Promisification Intern doFollow
Microtasks Intern doFollow
Async/await Intern doFollow
Generators, advanced iteration Intern doFollow
Generators Intern doFollow
Async iteration and generators Intern doFollow
Modules Intern doFollow
Modules, introduction Intern doFollow
Export and Import Intern doFollow
Dynamic imports Intern doFollow
Miscellaneous Intern doFollow
Proxy and Reflect Intern doFollow
Eval: run a code string Intern doFollow
Currying Intern doFollow
Reference Type Intern doFollow
BigInt Intern doFollow
Document Intern doFollow
Browser environment, specs Intern doFollow
DOM tree Intern doFollow
Walking the DOM Intern doFollow
Searching: getElement*, querySelector* Intern doFollow
Node properties: type, tag and contents Intern doFollow
Attributes and properties Intern doFollow
Modifying the document Intern doFollow
Styles and classes Intern doFollow
Element size and scrolling Intern doFollow
Window sizes and scrolling Intern doFollow
Coordinates Intern doFollow
Introduction to Events Intern doFollow
Introduction to browser events Intern doFollow
Bubbling and capturing Intern doFollow
Event delegation Intern doFollow
Browser default actions Intern doFollow
Dispatching custom events Intern doFollow
UI Events Intern doFollow
Mouse events Intern doFollow
Moving the mouse: mouseover/out, mouseenter/leave Intern doFollow
Drag'n'Drop with mouse events Intern doFollow
Pointer events Intern doFollow
Keyboard: keydown and keyup Intern doFollow
Scrolling Intern doFollow
Forms, controls Intern doFollow
Form properties and methods Intern doFollow
Focusing: focus/blur Intern doFollow
Events: change, input, cut, copy, paste Intern doFollow
Forms: event and method submit Intern doFollow
Document and resource loading Intern doFollow
Page: DOMContentLoaded, load, beforeunload, unload Intern doFollow
Scripts: async, defer Intern doFollow
Resource loading: onload and onerror Intern doFollow
Miscellaneous Intern doFollow
Mutation observer Intern doFollow
Selection and Range Intern doFollow
Event loop: microtasks and macrotasks Intern doFollow
Frames and windows Intern doFollow
Popups and window methods Intern doFollow
Cross-window communication Intern doFollow
The clickjacking attack Intern doFollow
Binary data, files Intern doFollow
ArrayBuffer, binary arrays Intern doFollow
TextDecoder and TextEncoder Intern doFollow
Blob Intern doFollow
File and FileReader Intern doFollow
Network requests Intern doFollow
Fetch Intern doFollow
FormData Intern doFollow
Fetch: Download progress Intern doFollow
Fetch: Abort Intern doFollow
Fetch: Cross-Origin Requests Intern doFollow
Fetch API Intern doFollow
URL objects Intern doFollow
XMLHttpRequest Intern doFollow
Resumable file upload Intern doFollow
Long polling Intern doFollow
WebSocket Intern doFollow
Server Sent Events Intern doFollow
Storing data in the browser Intern doFollow
Cookies, document.cookie Intern doFollow
LocalStorage, sessionStorage Intern doFollow
IndexedDB Intern doFollow
Animation Intern doFollow
Bezier curve Intern doFollow
CSS-animations Intern doFollow
JavaScript animations Intern doFollow
Web components Intern doFollow
From the orbital height Intern doFollow
Custom elements Intern doFollow
Shadow DOM Intern doFollow
Template element Intern doFollow
Shadow DOM slots, composition Intern doFollow
Shadow DOM styling Intern doFollow
Shadow DOM and events Intern doFollow
Regular expressions Intern doFollow
Patterns and flags Intern doFollow
Character classes Intern doFollow
Unicode: flag "u" and class \p{...} Intern doFollow
Anchors: string start ^ and end $ Intern doFollow
Multiline mode of anchors ^ $, flag "m" Intern doFollow
Word boundary: \b Intern doFollow
Escaping, special characters Intern doFollow
Sets and ranges [...] Intern doFollow
Quantifiers +, *, ? and {n} Intern doFollow
Greedy and lazy quantifiers Intern doFollow
Capturing groups Intern doFollow
Backreferences in pattern: \N and \k<name> Intern doFollow
Alternation (OR) | Intern doFollow
Lookahead and lookbehind Intern doFollow
Catastrophic backtracking Intern doFollow
Sticky flag "y", searching at position Intern doFollow
Methods of RegExp and String Intern doFollow
Comments Intern doFollow
submit a GitHub issue Extern doFollow
plnkr Extern doFollow
jsbin Extern doFollow
codepen Extern doFollow
about the project Intern doFollow
contact us Intern doFollow
terms of usage Intern doFollow
privacy policy Intern doFollow

SEO Keywords
Keywords Cloud tutorial javascript object introduction events more methods properties code browser
Keywords Consistentie
Keyword Content Title Keywords Description Headings
events 11
methods 10
javascript 9
browser 7
code 7

Bruikbaarheid
Url Domein : javascript.info
Lengte : 15
Favicon Goed, uw website heeft een favicon.
Printbaarheid Jammer. We vonden geen Print-Vriendelijke CSS.
Taal Goed. Uw ingestelde taal is en.
Dublin Core Deze pagina maakt geen gebruik van Dublin Core.

Document
Doctype HTML 5
Encoding U heeft geen Charset ingesteld voor uw pagina. Gebruik deze gratis meta tags generator om de Charset van uw website mee in te stellen.
W3C Validiteit Fouten : 2
Waarschuwingen : 1
E-mail Privacy Geweldig er is geen e-mail adres gevonden als platte tekst!
Niet ondersteunde HTML Geweldig! We hebben geen niet meer ondersteunde HTMl tags gevonden in uw HTML.
Speed Tips
Geweldig, uw website heeft geen tabellen in een tabel.
Jammer, uw website maakt gebruik van inline styles.
Geweldig, uw website heeft een correct aantal CSS bestanden.
Jammer, uw website heeft teveel JS bestanden (meer dan 6).
Jammer, uw website haalt geen voordeel uit gzip.

Mobile
Mobile Optimization
Apple Icon
Meta Viewport Tag
Flash content

Optimalisatie
XML Sitemap Ontbrekend

Uw website heeft geen XML sitemap- dit kan problematisch zijn.

Een sitemap vermeld url's die beschikbaar zijn voor crawlen en kan extra informatie bevatten zoals uw laatste site-updates, frequentie van wijzigingen en het belang van de url's. Dit laat zoekmachines toe om de site intelligenter te doorzoeken.
Robots.txt http://javascript.info/robots.txt

Geweldig uw website heeft een robots.txt bestand.
Analytics Perfect, uw website heeft een analytics tool.

   Google Analytics

PageSpeed Insights

Device
Categorieën

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