OOQ

#JavaScript #isNaN() isNaN() isNaN() - A function that checks if the parameter is a number (NaN is Not a Number). Grammar isNaN( value ) value: Enter the value to check. Returns true if the parameter is not a number, false if it is a number. example Returns false because 123.123 is a number. '123.123' is quoted but treated as a number and returns false. 'Not a Number' returns true because it is ..

#JavaScript #Global Variables and Local Variables global and local variables Variables can be divided into Global Variables and Local Variables according to their scope. A global variable is a variable declared outside a function and accessible throughout the program. A local variable is a variable declared within a function that is created when the function is executed and destroyed when the fu..

#php #php / operator / assignment operator The assignment operator in PHP is =. Save the right side of the equal sign to the left side of the equal sign. $a = 10; Assign 10 to variable a. $a = 10; $a = 20; If you assign multiple times, the last assigned will be the value. So the value of variable a is 20. $a = 10; $a = $a + 10; You can use existing values. The value of variable a is 20.

#php #How to create PHP Sometimes it is necessary to automatically create variables according to a schedule rule. It seems that such a variable is called a floating variable, but I'm not sure if it's an official term. When I try to create a flow variable, I have to put the variable in when creating the variable name. For example, if you wanted to put the name $var in your variable name, you woul..

#HTML #q, blockquote/quote q, blockquote Tags that indicate a quote are q and blockquote. q is an inline element and blockquote is a block element. Grammar ... ... The source of the citation is represented by the cite attribute. Entering the cite attribute is optional and not visible in web browsers. example 1 The basic form of the q element is to enclose the quoted phrase in double quotes. Lore..

#HTML #ol, ul, dl #sorted list, unsorted list, definition list ordered list - ol An ordered list is a list with sequentially increasing numbers such as 1, 2, 3, . An ordered list is created with ol and the contents of the list with li. Ordered List Lorem Ipsum Dolor Add the start attribute to specify the starting number. Add the value attribute to specify a specific list number. Below is a simpl..

#HTML #br HTML recognizes multiple consecutive spaces or line breaks as a single space. Therefore, even if you break a line in the code or float it several times, it will be expressed by floating once. If you want a line break inside a block element, use the br tag. The following is an example of line breaks using the br tag. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aenean nec mo..

#Html #h1, h2, h3, h4, h5, h6, p HTML/h1, h2, h3, h4, h5, h6, p/ title and paragraph title The title consists of the tags h1, h2, h3, h4, h5, h6. They are closely related to the structure of the document, so it's best to use them in order. Paragraph Paragraphs are made up of p tags. Large spaces between paragraphs. If you want a line break within a paragraph, use the br tag. example 1 The basic ..

#HTML basic grammar The most basic grammar is: Contents All of the above are called elements. is the start tag, is the end tag, and the two together are called a tag. Contents is content. for example Lorem is called a p element, the start tag is , the end tag is , and the content is Lorem. attributes Tags can have attributes. Contents For example, if you want to add an id attribute to your block..

#javascript #isFinite() isFinite() isFinite() is a function that checks if a parameter is finite. Grammar isFinite( value ) value: Enter the value to check. Returns true if the number is finite, false if the number is infinite or not a number. example Returns true since 123.123 is a finite number. Infinity returns false because it is an infinite number. Returns false because Not a Number is a ch..