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Dynamically add html elements and simple examples of attributes with js

Dynamically add html elements and simple instances of attribute function test(){//Create node var lswt_2=document.createElement("div");//Set node idlswt_2.id='lswtColse';//Set

2025-07-08
JavaScript to obtain and judge the height, width of browser windows, screens, web pages, etc.

HTML precise positioning properties: scrollLeft, scrollWidth, clientWidth, offsetWidthscrollHeight: Get the scroll height of the object. scrollLeft: Set or get between the left edge of the object and the leftmost end of the currently visible content in th

2025-07-08
A comprehensive overview of javascript operator syntax

In the previous words, most of the operators in javascript are represented by punctuation marks, and a few are represented by keywords. Their syntax is concise, but their number is quite large. Operators always follow some fixed syntax. Only by understand

2025-07-08
js canvas implement erasing animation

The examples in this article share with you the implementation principle, implementation code, and problems encountered in the implementation process for your reference. The following principle is summarized as erasing a certain image on a mobile device t

2025-07-08
Beautify and improve tabs controls in BootStrap (recommended)

The tabs control in BootStrap is very popular among developers for its simplicity and ease of use. However, its style is relatively single, how can it achieve a more beautiful effect based on its original form? I have been considering this issue. In addit

2025-07-08
ui component input multiple-select pull-down implementation method (with search function)

My style, let’s first introduce the renderings. If you feel it’s pretty good, please refer to the implementation code. Let's not talk nonsense and look at the div hierarchy first <div> <label fo

2025-07-08
Detailed explanation of common methods of Javascript strings

A string string is one or more characters arranged together, placed in single or double quotes. The strings in 'abc'"abc"length attribute js are similar to arrays, and are composed of characters one by one, so you can use the length attr

2025-07-08
== operation in JS: [''] == false ―>true

Calculate the value of the following expression: [''] == false First, the two operands are object type and boolean type. According to Figure 1, the Boolean type needs to be converted to a numeric type, and the result of converting false to a numer

2025-07-08
Bootstrap implements horizontally arranged forms

Label tags and control groups can be laid horizontally side by side by side by side by adding the .form-horizontal class to the form and using Bootstrap's preset raster classes. Doing so changes the behavior of the .form-group to behave as rows in the

2025-07-08
JavaScript type system - undefined and null comprehensive understanding

In the previous general programming language, only null is empty, but JavaScript designer Brendan Eich designed an undefined, which undoubtedly increases the complexity of the program, but there is a certain reason for doing so. This article will introduc

2025-07-08
BootStrap additional navigation components

What is Bootstrap? Bootstrap is a front-end framework for the rapid development of web applications and websites. Bootstrap is based on HTML, CSS, and JAVASCRIPT. History Bootstrap is by Twitter's Mark Ott

2025-07-08
Detailed discussion on the implementation of seed random numbers and functions in JS

Preface In front-end development, especially game development, random numbers are often used. Then we will think of: Math.random. Let’s take a look at the following code: for (var i= 0; i<10; i++) { document.writeln(Math.random()

2025-07-08
JavaScript special effects implementation - a simple example of current time and countdown effect

The key to implementing this effect is the use of Date objects and setTimeout. There are three examples in total. The HTML structure is as follows, so no CSS style is added.<body> Current time:<p id="p1"></p> Countdown to the college entrance examination:

2025-07-08
A brief analysis of array type system in JavaScript

The previous array is a set of values arranged in order, and relative to the object's property names are unordered. Essentially, arrays use numbers as lookup keys, while objects have user-defined attribute names. JavaScript does not have real associ

2025-07-08
Detailed explanation of the benefits of using prototypes to define methods in js

Often interviewing on the front end or communicating with other peers is that when it comes to constructing a constructor in JS, it is best to use prototypes: define the method on the prototype of the constructor. The advantage is that the methods that ar

2025-07-08

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