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JS dynamically adds the instance code of select option through system time limitation

Although it is a simple effect, it still needs to be accumulated and recorded; the source code is as follows:<select id="myselect1"><option value=""> ― ―</option><option value="2015级"> Level 2015

2025-08-25
js to determine whether the check box is selected and the number of selected implementation code

Use js to determine whether the check box is selected and the number of selected check boxes. In the past, friends often mentioned the selection of check boxes. This code can help you solve this problem, and it can also determine how many check boxes you

2025-08-25
Methods to traverse properties and values of objects in js

Examples are as follows: var Statistics_Website_logo ={ 'Website_logo_title':'Xueersi', 'Website_logo_Theme':'Education Industry',

2025-08-25
JavaScript method to detect whether CSS animation has been completed

No word on the code: WN:(function(){ var el = $('<fakeelement> '), transition="transition", transitionEnd, ani

2025-08-25
Use JavaScript to determine whether the mobile browser is horizontal or vertical.

//Judge the horizontal and vertical screen status of the mobile phone: function henshuping(){if(window.orientation==180||window.orientation==0){alert("vertical screen status!")}if(window.orientati

2025-08-25
Detailed explanation and examples of copy deep copy of AngularJS API

angular provides an API that can copy objects - copy(source, destination), which will perform deep copy of the source object. The following points should be noted when using it: If there is only one parameter (the object with no copy specified), a copy ob

2025-08-25
Web Worker usage guide for HTML5

This article mainly introduces the Web Worker usage strategy for HTML5, especially the JS that combines worker's expertise and is very effective in using it. Friends who need it can refer to Web Workers is a JavaScript multi-threaded solution provided

2025-08-25
ion content Quick solution to scrolling to the bottom will obscur part of the view

The main reason for the above problem is that the product requirements require clicking to hide or expand the secondary list, which leads to the ion-content problem. After many attempts, I finally found a solution. It is very simple. Just pre-inject $ioni

2025-08-25
Examples of events generated when JS closes a window and usage

This article describes the events and usages generated when JS closes a window. Share it for your reference, the details are as follows: /****************** Close the window and submit evaluation*******************/window.onbeforeunload = function(){ var

2025-08-25
Photo Album Display PhotoSwipe.js plugin implementation

PhotoSwipe.js official website: http://photoswipe.com/ , PhotoSwipe files and related examples can be downloaded on this website. This component is mainly used to display pictures and albums, and is very practical. 1. Using this component requires two js

2025-08-25
Understand the difference between node exports and module.exports

We only need to know three points to know the difference between exports and module.exports: 1.exports is a reference to module.exports 2. The initial value of module.exports is an empty object {}, so the initial value of exports

2025-08-25
Deep understanding of floating point numbers in JavaScript

js has only one numerical data type. Whether it is an integer or a floating point number, js classifies it as a number. typeof 17; // "number" typeof 98.6; // "number" typeof 2.1; // All numbers in "number" js are double-prec

2025-08-25
Some experiences on using document.write

I have always used the document.write() method to display data to the browser, and used it as Alert(). It seems that this kind of use is a bit underused. Let's talk about its main uses. The document.write() method can be used in two aspects: 1. During

2025-08-25
AngularJS introduction tutorial: Select (select box) detailed explanation

AngularJS Select (Select Box) AngularJS You can create a drop-down list option using an array or object. Use ng-options to create a selection box In AngularJS we can use the ng-option directive to create a drop-down list, and the list items are passed thr

2025-08-25
JS implements color picker on web pages

Use Js code to write a color picker for a web page, that is, to select a color, click any color block with the mouse, and the color value will pop up. When you want to use a certain color but don’t know the color value, using this small special effect can

2025-08-25

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