Tutorial on using the Function() function in JavaScript_Basic knowledge

The function statement is not the only way to define a new function, and you can define your function dynamically using the Function() constructor using operators.

Note: This is a term for object-oriented programming. You may feel a bit unaccustomed to it the first time, but there is no problem here.
Grammar

The following is the syntax for using the new operator to create a constructor using Function().

<script type="text/javascript">
<!--
var variablename = new Function(Arg1, Arg2..., "Function Body");
//-->
</script>

Function() function constructor expects any number of string parameters. The last parameter is the function body - it can contain arbitrary JavaScript statements, separated from each other by semicolons.

Please note that the Function() construct does not pass any parameters, specify a name to create the function for it. An unnamed function created using the Function() constructor is called an anonymous function.
Example:

The following is an example of creating a function:

<script type="text/javascript">
<!--
var func = new Function("x", "y", "return x*y;");
//-->
</script>

This line of code creates a new function that is more or less equivalent to the syntax of the defined function:

<script type="text/javascript">
<!--
function f(x, y){ 
 return x*y; 
}
//-->
</script>

This means you can call the above function as follows:

<script type="text/javascript">
<!--
func(10,20); // This will produce 200
//-->
</script>