OOQ

#css #css class selector A class selector selects elements that have a particular value as the value of their class attribute. Prefix the attribute value with . to indicate that it is a class. For example, the following will make elements with abc as the value of the class attribute red. .abc { color: red; } If nothing precedes the class selector If nothing precedes the class selector, selects a..

#javascript #JavaScript / Repeat Statements / while, do - while, for There are three iteration statements in JavaScript: while, do - while, and for. while grammar var i = 0; while ( i < 10 ) { // do something i++; } It runs from 0 to 9 for i and if i is 10 it doesn't run and goes on. Note that you must include i++ which increments i. If i++ is missing, the value of i will always be 0, so it will..

#JavaScript #JavaScript / conditional statement / switch The most basic conditional statement is the if. However, the disadvantage is that if there are many values ​​to compare in the conditional expression, the code becomes longer and less readable. In such cases, it is recommended to use switch. grammar switch ( condition ) { case value1: statement1; break; case value2: statement2; break; ... ..

#javascript #javascript conditionals if, else if, else We use if, else if, else when we want to do something when a certain condition is met. grammar if ( condition1 ) { statement1 } Executes statement1 if condition1 is met. if ( condition1 ) { statement1 } else { statement2 } Executes statement1 if condition1 is met, otherwise executes statement2. if ( condition1 ) { statement1 } else if ( cond..

#javascript #javascript typeof operator typeof Operator typeof is an operator that returns the data type of a variable. grammar typeof variable variable contains data or variables. Parentheses are allowed. typeof(variable) The returned values ​​are: undefined: if the variable is not defined or has no value number : if the data type is number string : if the data type is a string boolean : if the..

#SQL #SQL Server Creating a database The database is created with create database. Create a database named shop. create database shop; If you name the database or have special characters, enclose it in double quotes or parentheses. create database "shop.shop"; create database [shop.shop]; Delete database The database is deleted with the drop database. drop database shop; If you name the database..

#CSS #ID Selector The ID selector selects an element that has a specific value as the value of the id attribute. The attribute value is preceded by # to indicate that it is an ID. For example, the following makes the element with abc as the id attribute value red. #abc { color: red; }

#css #Attribute Selector Attribute Selector The attribute selector selects elements that have specific attributes, or elements that have specific attributes, such as specific values. [attributename] attributename Select the element that has the attribute. For example, the following selects the h1 element with the title attribute. h1[title] [attributename="value"] attributename Selects an element..

#CSS #type selector Type Selector Type selectors are selectors that select HTML elements such as h1, p, div, and span. For example, the following makes the contents of all p elements in an HTML document blue. p { color: blue; }

#CSS Universal Selector The full selector selects all HTML elements. It is represented by an asterisk (*). For example, the following makes all elements blue. * { color: blue; } It can be omitted when used in the same way as other selectors. So the next two lines produce the same result. *.abc { color: blue; } .abc { color: blue; }