Minimum heap maximum heap understand? To understand the application of heap in the front end
⚡ preface
We all know that a tree is a data structure, but we may rarely hear of the data structure heap. In fact, heap is a special kind of complete binary tree. For the front end, we usually know the maximum heap and minimum heap, and we often use the maximum heap and minimum heap to solve various problems. For example, the K largest ...
Posted by pbdude23 on Sun, 16 Jan 2022 14:07:45 +0100
JavaScript (data type + operator)
JavaScript (I) (data type + operator)
Introduction - JavaScript tutorial - online channel (wangdoc.com)
1, Data type
1. What is JavaScript language?
1.1 definitions
JavaScript is a lightweight scripting language. The so-called "script language" means that it does not have the ability to develop the operating system, but is only u ...
Posted by leetee on Sun, 16 Jan 2022 13:52:20 +0100
vue implements bidirectional data binding
Principle of realizing bidirectional data binding by vue
vue bidirectional data binding is realized by data hijacking combined with publisher subscriber mode.
vue through object Defineproperty() to implement data hijacking. Object.defineProperty() can control some special operations of objects, such as:
let person = {}
let name = ''
Object.d ...
Posted by Nomaad on Sun, 16 Jan 2022 13:41:47 +0100
JavaScript -- data type, function, array, string
1, Data type
(1) Data type
JavaScript variables can hold a variety of data types: numeric values, string values, arrays, objects, and so on:
var length = 7; // number
var lastName = "Gates"; // character string
var cars = ["Porsche", "Volvo", "BMW"]; // array
var x = {firstName:"Bil ...
Posted by jamess on Sun, 16 Jan 2022 13:00:43 +0100
bootstrap front-end development, use of CSS inline style
**1, * * background color
Attribute name: background colorFunction: add background color decoration in the box areaLoading area: load the background color within the borderAttribute value: color name, color value
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="wi ...
Posted by mr_tron on Sun, 16 Jan 2022 12:06:40 +0100
vite source code sorting
brief introduction
Vite has four commands: dev | build | optimize | preview. This paper combs the whole process of vite and briefly splits the main steps of dev | build, so as to facilitate everyone's understanding of vite source code as a whole. You are welcome to correct any mistakes.
start-up
The two default commands of vite project npm r ...
Posted by vitalyb on Sun, 16 Jan 2022 11:54:44 +0100
js event operation syntax
1, Event binding syntax
Grammatical form 1
Event listener} tag object addEventListener('click',function(){});
Grammatical form 2
The on syntax binds the} label object onclick = function(){}
On syntax is an event processing function bound by = equal assignment. In essence, the = equal assignment performs the overwrite assignment. The ...
Posted by dclamp on Sun, 16 Jan 2022 11:36:34 +0100
web development course, JavaScript naming identifier specification
Get geographic location information using HTML5
How to use HTML5 geolocation
For example, geoml5 supports more precise location functions on modern handheld devices, especially HTML5. First, we need to check whether the user's device browser supports geographic positioning, and if so, obtain geographic information. Note that this feature may ...
Posted by Gregadeath on Sun, 16 Jan 2022 10:32:27 +0100
web development course training, css pseudo element selector
Four positioning methods of CSS layout
1. static:
Default value. Without positioning, the element appears in the normal flow (ignoring the top, bottom, left, right or z-index declarations). Refer to the previous essay.
2. relative:
The element positioned as relative deviates from the normal document flow, but its position in the document fl ...
Posted by xxxxxx on Sun, 16 Jan 2022 06:28:40 +0100
On the process of optimizing picture matting with canvas
Premise: the work involves IPTV Set-top Box EPG development business. Normal IPTV Set-top Box video playback calls the Mediaplayer component encapsulated by the manufacturer, which is different from ordinary video playback. The rendered video window belongs to the underlying rendering of Android system, and the html page element is not a layer. ...
Posted by dmyst3 on Sun, 16 Jan 2022 04:33:14 +0100