OOQ

#javascript #JavaScript/Object/Array.join()/Concatenate array elements into one value .join() .join() concatenates the elements of an array into a single value. grammar var jbStr1 = jbAry.join(); Makes the elements of the jbAry array one value. Separate elements with a comma (,). To separate elements with a different character, put the desired character inside the (). var jbStr2 = jbAry.join( ' ..

#Javascript #JavaScript / Object / Array.concat() / Add elements or arrays to an existing array to create a new array .concat() You can use the .concat() property to add elements or arrays to an existing array to create a new array. grammar var jbAry2 = jbAry1.concat( 'abc' ); Add the string abc to the jbAry1 array to create the jbAry2 array. var jbAry3 = jbAry1.concat( jbAry2 ); Sum two arrays ..

#javascript #JavaScript / array (Array) / declare How to declare an array Method1 Create an array named jbAry. var jbAry = new Array(); assign a value. jbAry[0] = 'Lorem'; jbAry[1] = 'Ipsum'; jbAry[2] = 'Dolor'; Method2 var jbAry = [ 'Lorem', 'Ipsum', 'Dolor' ]; Method3 var jbAry = new Array( 'Lorem', 'Ipsum', 'Dolor' ); example This is an example of assigning values ​​to an array and then outpu..

Object creation method 1 var jb = { 'a':100, 'b':200, 'c':300 }; Object creation method 2 var jb = {}; jb['a'] = 100; jb['b'] = 200; jb['c'] = 300; Object creation method 3 var jb = new Object(); jb['a'] = 100; jb['b'] = 200; jb['c'] = 300; 객체 생성 방법 Object creation method 4 var jb = new Object(); jb.a = 100; jb.b = 200; jb.c = 300;

#JavaScript #JavaScript / Event / onsubmit / Event that causes a task to run before submitting the form JavaScript's onsubmit event allows you to do something before submitting the form values. Let's see how it works with a simple example. Example 1 Create a simple membership registration page. The transfer button is created with an input tag. Click Register and it will take you to ok.html. Regi..

#JavaScript #JavaScript / Functions / String() / Function to convert number to string String() String() is a function that converts a number to a string. Grammar String( object ) object : Enter a number or a variable whose value is a number. example The value of variable c is 3, which is the addition of number 1 and number 2. The value of variable d is 12, which is character 1 plus character 2. ..

#javascript #JavaScript / Functions / parseFloat(), parseInt() - functions to replace strings with numbers parseFloat() parseFloat() is a function that incorrectly replaces strings. Grammar parseFloat( string ) If you start with a number, it incorrectly replaces that number. If there are multiple numbers in the relief, replace only the first number. Spaces are ignored if they start with a space...

#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..

#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..