JavaScript - The Function() Constructors
The Function() Constructor
The function statement is not the only way to define a new function; you can define your function dynamically using Function() constructor along with the new operator. Constructor is a terminology from Object Oriented Programming. You may not feel comfortable for the first time, which is OK.
<script type = "text/javascript">
var variablename = new Function(Arg1, Arg2..., "Function Body");
</script>
Following is the syntax to create a function using Function( ) constructor along with the new operator.
The Function() constructor expects any number of string arguments. The last argument is the body of the function – it can contain arbitrary JavaScript statements, separated from each other by semicolons.
Notice that the Function() constructor is not passed any argument that specifies a name for the function it creates. The unnamed functions created with the Function() constructor are called anonymous functions
<html>
<head>
<script type = "text/javascript">
function secondFunction() {
alert('Hello, You Called?')
}
</script>
</head>
<body>
<p>Click the following button to call the function</p>
<form>
<input type = "button" onclick = "secondFunction()" value = "Call Function">
</form>
<p>Use different parameters inside the function and then try...</p>
</body>
</html>
