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Bootstrap implements the drop-down menu effect

The drop-down menu is used to display a toggleable, contextualized menu of the link list. 1. The case wraps the drop-down menu trigger and the drop-down menu in .dropdown, and then adds the HTML code that makes up the menu.<div>

2025-07-24
How to write click events in JavaScript

<button id="btn">click</button> var btn=document.getElementById('btn'); first type: btn.onclick=function(){alert('hello world');}

2025-07-24
JS determines the input string length example code (Chinese characters count two characters, alphanumeric count one)

When js determines the input string length instance code (Chinese characters count for two characters and alphanumeric count for one) text input, the submission failure will be caused by the limitation of the database table field length, so this method is

2025-07-24
JS implements the mutual conversion method of the numerical format of thousands of digits

Examples are as follows: /** * Convert the digital format to thousandquartiles*@param{Object}num */function commafy(num){ if((num+"").Trim()==""){ return""; } if(isNaN(num

2025-07-24
BootStrap selectpicker

mark a small issue encountered by using bootstrap selectpicker. Use $('.selectpicker').selectpicker('val', 'Musstard');//Single choice $('.selectpic

2025-07-24
Bootstrap must learn every day navigation components

Navigation is independent in the bootstrap framework and becomes a navigation component. According to different versions, the corresponding source code can be found: LESS: navs.lessSASS: _navs.scss tag navigation, also known as tab navigation tag navigati

2025-07-24
A brief analysis of object type Object in JavaScript

Objects in ECMAScript are actually a collection of data and functions. Object is the basis of all objects in ECMAScript. Understanding: The Object type is the basis of all its instances. In other words, any properties and methods that the Object type has

2025-07-24
Based on JS, the code sharing of provincial and municipal linkage effect

During the daily project development stage, the second-level linkage effect of the drop-down box is often seen, especially when there are multiple options involving regions, varieties, etc. For example: a common provincial and municipal linkage drop-down

2025-07-24
Node.js plug-in installation graphic tutorial

Introduction to Node.js Node.js is a Javascript running environment (runtime). In fact, it encapsulates the Google V8 engine. The V8 engine executes Javascript very quickly and has very good performance. Node.js optimizes some special use cases and provid

2025-07-24
Implement simple js two-way binding using Object.defineProperty

A few days ago, I was looking at the implementation of some popular mini mvvm frameworks (such as lighter frameworks such as avalon.js, vue.js, rather than heavier frameworks such as Angularjs and Emberjs). The popular modern mvvm framework generally bind

2025-07-24
js method to get the actual width and height of the Html element

The first case is that the width and height are written in the style sheet, such as #div1{width:120px;}. In this case, the width cannot be obtained through #div1.style.width, but the width can be obtained through #div1.offsetWidth. The second case is that

2025-07-24
Detailed explanation of Javascript's Date object

The Date object is a date and time object. Its main function is to implement the processing of date and time. 1. Create a Date object to copy the code as follows: var myDate = new Date(); or the copy code as follows: var myDate = new Date("July 21, 1

2025-07-24
A brief discussion on the loss of precision of decimals and large integers in JavaScript

Let’s first look at two questions: 0.1 + 0.2 == 0.3; // false999999999999999999 == 1000000000000000000; // true The first question is the accuracy of decimals, which has been discussed in many blogs in the industry. The second question is that last year t

2025-07-24
Project practice: image upload form or base64 front-end image compression (front-end image compression)

The first project has finally been launched. It is a public welfare crowdfunding platform called Qinqingchou. Most of the WeChat, computer and backend interfaces have been completed by me. After a few months, I feel that I have gained a lot and I think I

2025-07-24
AngularJs Learning Chapter 8 Filter Creation

demo This is the whole example demo1, filter.js file angular.module("exampleApp", []).constant("productsUrl", "http://localhost:/products").contro

2025-07-24

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