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Two multiple-choice selects (multiple or so) add, delete options and value instances

I don’t know how to describe it, there are two select pull-downs, made into text fields, where you can select the value from the result set on one side and add it to the other side; after the other side is deleted, the value will be back to the result set

2025-08-19
AngularJs concepts detailed explanation and sample code

Original address: http://code.angularjs.org/1.0.2/docs/guide/concepts continue. . 1. Summary This article mainly provides an overview of angular components and explains how they work. The list is as follows: status -

2025-08-19
A brief discussion on the mutual call of parent page method variables in js neutron

(1) The child page calls the parent page method or variable: window.parent.Method() or variable name window.parent is equivalent to the operation after positioning the parent page and writing window.parent.aa() the same as writing code in the parent page;

2025-08-19
Simple way to build a static file server with nodejs on windows

Use nodejs to build a static file server on Windows. Even if you don’t have any basic foundation, you can learn to build a nodejs static file server. This article introduces it in detail and is very suitable for friends who have no basic foundation to lea

2025-08-19
AngularJs Using $location Detailed explanation and sample code

1. What does it do $location service analyzes the URL in the browser's address bar (based on window.location), allowing us to use the things in the URL more conveniently in the application. Changing the URL in the address bar will respond to the $loca

2025-08-19
What is a JavaScript injection attack?

Javascript can be used as a tool for hackers to attack websites. Injecting malicious scripts by js (javascript) is one of the methods. So, let’s learn how to prevent js injection attacks. Here is a good statement. I would like to share with you: What is J

2025-08-19
Quick solution to the error when connecting to MongoDB database NodeJS

Today I tried to connect to MongoDB database for the first time, and the specific steps are also very simple. First, install the MongoDB package through the NodeJS running environment, enter the directory to be installed, execute the statement npm install

2025-08-19
Example of JS pop-up layer positioning to screen centering

The code copy is as follows:

2025-08-19
Commonly used tags for HTML (4)——Introduction to HTML

1.<html> ...</html> Tagging an HTML file, whether simple or complex, is<html> Start with</html> Ending.<html> The tag also indicates that this file is an HTML file when the browser encounters it<html> When marking, the following text will be interpreted a

2025-08-19
js to get the absolute path to upload file

In html <input type="file" id="importFile" /><input type="button" onclick="upload()"/><script>function upload() { var

2025-08-19
Share the method of listening to all Ajax request events in JavaScript

If the Ajax request is initiated by jQuery's $.ajax, by default, you can use jQuery's Global Ajax Event Handlers to listen to the Ajax event. However, what I encountered was an Ajax request initiated with native JavaScript, so this method does not

2025-08-19
Javascript HTML5 Canvas implements disc lottery function

We often participate in various e-commerce promotional activities, such as purchasing to a certain amount to conduct lottery activities, such as WeChat lottery, Taobao lottery, Thunder Money-making Bao disk lottery activities, etc. Part of these lottery a

2025-08-19
js Simple way to judge various data types (recommended)

Those who know js know that there is a typeof used to judge various data types. There are two ways to write it: typeof xxx, typeof(xxx) as follows: typeof 2 Output numbertypeof null Output objecttypeof {} Output object

2025-08-19
Detailed explanation of the most confusing scope, enhancement, and closure knowledge in JavaScript (recommended)

1. Function scope 1. Function scope is that the scope is in a "Function", and all variables belonging to this function can be used and multiplexed within the entire function scope. function foo(a) {var b = 2;function bar() {// ...}var c =

2025-08-19
An example of the meaning of that in javascript

You may find that there is a sentence in the code written by others: var that = this;, what does this mean? In javascript, this represents the current object. var that=this is to copy the current this object into that variable. What's the point of doi

2025-08-18

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