HTML anastasia

There is an example of Javascript variables:



<br />
<title>Variables!!!</title>
<script type="text/javascript">
var one = 21;
var two = 12;
var add = one + two;
var minus = one - two;
var multiply = one * two;
var divide = one/two;
 document.write("First No: = " + one + "<br />Second No: = " + two + " <br />");
 document.write(one + " + " + two + " = " + add + "<br/>");
 document.write(one + " - " + two + " = " + minus + "<br/>");
 document.write(one + " * " + two + " = " + multiply + "<br/>");
 document.write(one + " / " + two + " = " + divide + "<br/>");
</script>
<br />

JavaScript variables can hold many data types: numbers, strings, objects and more:

var length = 16;                               // Numbervar lastName = "Johnson";                      // Stringvar x = {firstName:"John", lastName:"Doe"};    // Object

An example:

<h2>JavaScript</h2>

<p>When adding a number and a string, JavaScript will treat the number as a string.</p>

<p id="demo"></p>

<script>
var x = 16 + "Volvo";
document.getElementById("demo").innerHTML = x;

</script>

JavaScript

When adding a number and a string, JavaScript will treat the number as a string.

Operator	Description
+	Addition
-	Subtraction
*	Multiplication
**	Exponentiation (ES2016)
/	Division
%	Modulus (Remainder)
++	Increment
--	Decrement

A typical arithmetic operation takes two numbers and produces a new number.

Code looks like that:

<h2>JavaScript Operators</h2>

<p>JavaScript uses arithmetic operators to compute values (just like algebra).</p>

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML = (2 + 11) * 10;
</script>

JavaScript Operators

JavaScript uses arithmetic operators to compute values (just like algebra).

Here an example of code:

<script>
var x, y, z;  // Statement 1
x = 22;    // Statement 2
y = 10;    // Statement 3
z = x + y;  // Statement 4

document.getElementById("demo").innerHTML =
"The value of z is " + z + ".";

JavaScript Statements

A JavaScript program is a list of statements to be executed by a computer.
</script>

JavaScript Display Possibilities

• Writing into an HTML element, using innerHTML.
• Writing into the HTML output using document.write().
• Writing into an alert box, using window.alert().
• Writing into the browser console, using console.log().

---

Using innerHTML

Another page with Javascript

Simple paragraph

Simpliest code:

<h2>Is this javascript?</h2>

<button type="button"
onclick="document.getElementById('demo').innerHTML = Date()">
Click me to display Date and Time.</button>

<p id="demo"></p>

Is this javascript?

Click me to display Date and Time.