To create function in javascript we should write just:


function hello() {
}


For example lets call Alert with text Hello World :


function hello() {
alert("Hello World");
}


And call this function:


hello();


If you need to send some parameters in function, just write like this:


function hello(s) {
alert(s);
}
hello("Hello World");


We call this function with parameters and you can see “Hello World” in alert again.