How to invoke javascript functions?
Javascript functions can be written in a javascript file or directly in an HTML document.
In both cases, when they are defined, they need to be called in order to be executed.
<html>
<body>
<p id="demo"></p>
<script type="text/javascript">
function addText() {
let a=document.getElementById("demo");
a.innerText="The function executed";
}
addText();
</script>
</body>
</html>
<html>
<head>
<style>
button {width:100px;
height:55px;
color:red;}
</style>
</head>
<body>
<button onclick="message();">PRESS</button>
<script type="text/javascript">
function message()
{
alert("This is simple function called message()");
}
</script>
</body>
</html>
<script>
</script>