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Self-study IT network Linux load balancing video tutorial

Course Intermediate 11357

Course Introduction："Self-study IT Network Linux Load Balancing Video Tutorial" mainly implements Linux load balancing by performing script operations on web, lvs and Linux under nagin.

Shangxuetang MySQL video tutorial

Course Advanced 17659

Course Introduction："Shangxuetang MySQL Video Tutorial" introduces you to the process from installing to using the MySQL database, and introduces the specific operations of each link in detail.

Band of Brothers front-end example display video tutorial

Course Advanced 11373

Course Introduction："Brothers Band Front-end Example Display Video Tutorial" introduces examples of HTML5 and CSS3 technologies to everyone, so that everyone can become more proficient in using HTML5 and CSS3.

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Observing state object in pinia does not trigger when object changes

I have a deep object in my pinia state where I want to place an observer. exportconstuseProductStore=defineStore("product",{state:()=>({attributes:{},}),});When there is data inside the object, it looks like this: attributes:{english:{0: {key:"key1&a

2023-08-28 12:14:33

No need to subscribe to Observable, an imperative way to edit reactive form data in Angular

Here's the process I've been using to subscribe and update a reactive form based on observable data. Maybe there is a way to solve the problem without subscribing to the observable and changing the value. @Component({selector:'app-my-component',template:`<form[formGroup]="myForm"><inputformControlName="name"/>

2024-03-29 18:37:15

java - How to determine whether null or empty is returned when spring returns json?

It is very convenient to use the @ResponseBody provided by spring to return the json object. But there is a problem. Sometimes it is impossible to judge whether @ResponseBody will return empty("") or null. The questioner made a rough observation. It seems that whether the String in java is null or "", it will eventually pass...

2017-06-14 10:51:24

IntersectionObserver's callback function was not called

I have a cross viewer. Everything works fine. I have a top section. But when I scroll down and then refresh (it refreshes to the previously visible section), the cross-viewer callback is called to the top section instead of the visible section. constobserverCallBack=(entries,observer)=>{const[entry]=entriesconsole.log("Callback:",entry.target)if(!e

2023-08-15 20:15:03

Watch in Vuejs/Nuxtjs cannot monitor changes in object arrays from Vuex Store

I'm developing an application in this application using Vuejs/Nuxtjs, I have a component IdentifiersNode.vue in which I want to monitor the Vuex storage array identifiersArray. I can watch direct changes to identifiersArray, like push, direct key value changes, but when I add new objects to the objects in identifiersArray, watch won't work for some reason. Below is my IdentifiersNode

2024-03-26 15:34:10

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How to use Vue.observable to create observable objects in Vue

Course Introduction：Vue is a popular JavaScript framework that provides many features, including observable objects. An Observable is a reactive object that notifies all components and properties that depend on it when it changes. Vue.observable is a function used to create observable objects. This article will introduce the implementation method and common scenarios of Vue.observable. 1. Basic usage of Vue.observable First, use Vue.ob in Vue

2023-06-11 comment 0 1188

How to Retrieve the Current Value of an RxJS Subject or Observable in Angular?

Course Introduction：Obtaining the Current Value of an RxJS Subject or ObservableIn Angular applications, observables are commonly used to stream data between...

2024-11-04 comment 0 825

How to Get the Current Value of an RxJS Subject or Observable in Angular?

Course Introduction：Getting Current Value of RxJS Subject or ObservableIn Angular applications, it's common to use subjects or observables for data sharing and...

2024-11-03 comment 0 432

How to Retrieve the Current Value of an Observable or Subject?

Course Introduction：Retrieving the Current Value of Observable or SubjectThis inquiry pertains to the challenge of extracting the present value from an Observable or...

2024-11-03 comment 0 1057

In-depth analysis of the observer pattern in PHP object-oriented programming

Course Introduction：In-depth analysis of the Observer pattern in PHP object-oriented programming The Observer pattern is a commonly used design pattern used to achieve loose coupling between objects in software systems. Its core idea is: an object (called an observer or subject) maintains a list of objects (called observers) that depend on it. When the state of the observed object changes, it will automatically notify all observers. . In this way, the observer pattern can implement a one-to-many relationship between objects. When an object changes, all related objects will be notified and can

2023-08-13 comment 0 1415

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