Vue front-end framework 10 component composition, component nesting relationship, component registration method, component transfer data (props $emit), array transfer of multiple data types, component transfer props verification, component events

Article directory 1. Component composition 2. Component nesting relationship 3. How to register components 4. Components pass data (through props) 5. Components pass multiple data types 6. Component delivery props verification 7. Component events 1. Component composition The biggest advantage of components is reusability Components are usually defined in .vue, which is SFC single file […]

The use of relation-graph, a vue relationship graph component

1. Introduction to relationship-graph A Vue relationship graph component, very easy to use 2. Usage steps Introduce relation-graph npm install –save relation-graph 3. Parameter configuration 1.Graph graph Configure some default styles, toolbars, etc. of the map The code is as follows (example): graphOptions: {<!– –> // debug: true, // Disable drag and drop disableDragNode: true, […]

Use el-table to realize tree structure diagram data display (no parent-child relationship to solve tree structure conversion problem)

1. Background: The requirement is to display the following data in an ordinary table 2. First, my data type is: 3. Normal data type: You can see that my data type does not have the word pid (that is, there is no node relationship) 3. Barely meets the requirements version (1) Step 1: Add node […]

The relationship between Qt’s event loop and threads

Let’s talk about the key points first and understand a few important concepts first. Event scheduler, the specific implementation of the scheduler is related to the operating system. Different operating systems have different implementations. For example, the implementation of the scheduler under the Linux system is QEventDispatcherUNIX, and their implementation under the window is QEventDispatcherWin32. […]

Popular explanation of the relationship and functions of equals and hashCode

Foreword Why do you have to override the hashCode method when overriding the equals method? This is a familiar and basic interview question. As working hours increase, many of the eight-part interview theories are gradually verified in work practice. But there are also some theories. After passing the interview stage, it seems that they will […]

The relationship and implementation principle of Endpoint, HasFeatures, NamedFeature and Actuator in Spring

Article directory 1. Reason for relationship 2. Introduction and simple use of Actuator 3. The relationship between Endpoint and Actuator 4. The relationship between Endpoint and HasFeatures 5. Analysis of Endpoint and HasFeatures principles 5.1 Implementation principle of Endpoint 5.2 Implementation principle of HasFeatures 6. Personal chat 1. Reason for relationship We can often see […]

QT (10): Construction, destruction and parent-child relationship of QObject objects

1. Parent-child relationship of QObject objects QObject::QObject(QObject *parent) : d_ptr(new QObjectPrivate) {<!– –> Q_ASSERT_X(this != parent, Q_FUNC_INFO, “Cannot parent a QObject to itself”); Q_D(QObject); d_ptr->q_ptr = this; //Thread data initialization. If the parent object parameter exists, the thread data of the parent object is obtained. If the parent object parameter does not exist, the thread […]

Design of relational database tree structure

When designing programs, tree structures are often used to represent the relationships between certain data, such as upper- and lower-level departments of an enterprise, product classifications, file directories, etc. These tree structures need to be persisted with the help of a database, and relational databases do not have a corresponding native data structure to store […]

[pytest] The relationship between tep environment variables, fixtures, and use cases

tep is a testing tool that integrates third-party packages based on the pytest testing framework to provide project scaffolding to help quickly implement automated projects by writing Python code. In the tep project, automated test cases are placed in the tests directory. Each .py file is independent of each other and has no dependencies. One […]