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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>demo</title>
</head>
<body>
<!--=====Function 1 alert with function======-->
<input type="button" onclick="sayHello()" value="Say Hello">
<script>
function sayHello()
{
alert("Hello there!");
}
</script>
<!--=====Function 2 alert data with function======-->
<input type="button" onclick="sayHello('Zara', 7)" value="Say Hello">
<script>
function sayHello(name, age)
{
alert(name + " is " + age + " years old.");
}
</script>
<!--=====Function 3 print data with var function=====-->
<p id="demo"></p>
<script>
function myFunction(a, b) {
return a * b;
}
var x = myFunction(4, 3);
document.getElementById("demo").innerHTML = x;
</script>
<!--=====Function 4 print value with function======-->
<p id="demo14"></p>
<script>
var a = 4;
function myFunction() {
document.getElementById("demo14").innerHTML = a * a;
}
</script>
<p id="demo41"></p>
<script>
var x = 7;
function myFunc2(a){
return a * a;
}
document.getElementById('demo41').innerHTML = myFunc2(5) * x;
</script>
<!--=====Function 5 anonymous / function expression======-->
<p id="demo3"></p>
<script>
var x = function (a, b) {return a * b};
document.getElementById("demo3").innerHTML = x(4, 3);
</script>
<!--=====Function 6 print data with var function======-->
<p id="demo6"></p>
<script>
function myFunction(a, b) {
return a * b;
}
var x = myFunction(4, 3) * 2;
document.getElementById("demo6").innerHTML = x;
</script>
<!--=====Function 7 object function======-->
<p id="demo4"></p>
<script>
var person = {
firstName: "John",
lastName : "Doe",
id : 5566,
fullName : function() {
return this.firstName + " " + this.lastName;
}
};
document.getElementById("demo4").innerHTML = person.fullName();
</script>
<!--=====Function 8 concatenate function======-->
<input type="button" onclick="secondFunction()" value="Call Function">
<script>
function concatenate(first, last)
{
var full;
full = first + last;
return full;
}
function secondFunction()
{
var result;
result = concatenate('Zara', 'Ali');
document.write (result );
}
</script>
<!--=====Function 9 object constructor call function======-->
<p id="demo9"></p>
<script>
var person = {
fullName: function() {
return this.firstName + " " + this.lastName;
}
}
var person1 = {
firstName:"John",
lastName: "Doe",
}
var person2 = {
firstName:"Mary",
lastName: "Doe",
}
var x = person.fullName.call(person1);
document.getElementById("demo9").innerHTML = x;
</script>
<!--=====Function 10 object constructor call function======-->
<p id="demo11"></p>
<script>
var person = {
fullName: function(city, country) {
return this.firstName + " " + this.lastName + "," + city + "," + country;
}
}
var person1 = {
firstName:"John",
lastName: "Doe",
}
var person2 = {
firstName:"Mary",
lastName: "Doe",
}
var x = person.fullName.call(person1, "Oslo", "Norway");
document.getElementById("demo11").innerHTML = x;
</script>
<!--=====Function 11 object constructor apply function======-->
<p id="demo12"></p>
<script>
var person = {
fullName: function(city, country) {
return this.firstName + " " + this.lastName + "," + city + "," + country;
}
}
var person1 = {
firstName:"John",
lastName: "Doe",
}
var x = person.fullName.apply(person1, ["Oslo", "Norway"]);
document.getElementById("demo12").innerHTML = x;
</script>
<!--=====Function 12 object constructor new function=====-->
<p id="demo2"></p>
<script>
var myFunction = new Function("a", "b", "return a * b");
document.getElementById("demo2").innerHTML = myFunction(4, 3);
</script>
<!--=====Function 13 consturctor value new function======-->
<p id="demo8"></p>
<script>
function myFunction(arg1, arg2) {
this.firstName = arg1;
this.lastName = arg2;
}
var x = new myFunction("John","Doe")
document.getElementById("demo8").innerHTML = x.firstName;
</script>
<!--=====Function 14 self invoke======-->
<p id="demo">0</p>
<script>
var add = (function () {
var counter = 0;
return function () {
counter += 1; return counter;
}
})();
function myFunction(){
document.getElementById("demo").innerHTML = add();
}
</script>
</body>
</html>