Usage tutorial of pseudo elements::before and ::after

Classification and Usage Analysis of JSP Comments JSP comments are divided into two types: single-line comments: ending with, only a single line of code can be commented. Multi-line comments: starting with /* and ending with */, you can comment multiple lines of code. Single-line comment example Multi-line comment example/**This is a multi-line comment*Can comment on multiple lines of code*/Usage of JSP comments JSP comments can be used to comment JSP code to make it easier to read

WPS is a commonly used office software suite, and the WPS table function is widely used for data processing and calculations. In the WPS table, there is a very useful function, the DATEDIF function, which is used to calculate the time difference between two dates. The DATEDIF function is the abbreviation of the English word DateDifference. Its syntax is as follows: DATEDIF(start_date,end_date,unit) where start_date represents the starting date.

How to use the exit function in C language requires specific code examples. In C language, we often need to terminate the execution of the program early in the program, or exit the program under certain conditions. C language provides the exit() function to implement this function. This article will introduce the usage of exit() function and provide corresponding code examples. The exit() function is a standard library function in C language and is included in the header file. Its function is to terminate the execution of the program, and can take an integer

The ISNULL() function in MySQL is a function used to determine whether a specified expression or column is NULL. It returns a Boolean value, 1 if the expression is NULL, 0 otherwise. The ISNULL() function can be used in the SELECT statement or for conditional judgment in the WHERE clause. 1. The basic syntax of the ISNULL() function: ISNULL(expression) where expression is the expression to determine whether it is NULL or

Detailed explanation of distinct usage in SQL In SQL databases, we often encounter situations where we need to remove duplicate data. At this time, we can use the distinct keyword, which can help us remove duplicate data and make the query results clearer and more accurate. The basic usage of distinct is very simple, just use the distinct keyword in the select statement. For example, the following is a normal select statement: SELECTcolumn_name

Usage of Transform in CSS The Transform property of CSS is a very powerful tool that can perform operations such as translation, rotation, scaling and tilting of HTML elements. It can dramatically change the appearance of elements and make web pages more creative and dynamic. In this article, we will introduce the various uses of Transform in detail and provide specific code examples. 1. Translate (Translate) Translate refers to moving an element a specified distance along the x-axis and y-axis. Its syntax is as follows: tran

How to use Apple shortcut commands With the continuous development of technology, mobile phones have become an indispensable part of people's lives. Among many mobile phone brands, Apple mobile phones have always been loved by users for their stable systems and powerful functions. Among them, the Apple shortcut command function makes users’ mobile phone experience more convenient and efficient. Apple Shortcuts is a feature launched by Apple for iOS12 and later versions. It helps users simplify their mobile phone operations by creating and executing custom commands to achieve more efficient work and

CSS transition effect: How to achieve the sliding effect of elements Introduction: In web design, the dynamic effect of elements can improve the user experience, among which the sliding effect is a common and popular transition effect. Through the transition property of CSS, we can easily achieve the sliding animation effect of elements. This article will introduce how to use CSS transition properties to achieve the sliding effect of elements, and provide specific code examples to help readers better understand and apply. 1. Introduction to CSS transition attribute transition CSS transition attribute tra