JavaScript Throw statement throws exception instance

The purpose of the throw declaration is to create a exception (exception). You can use this declaration in conjunction with the Try...catch declaration to achieve the purpose of controlling the flow of the program and generating accurate error messages.

<script language= "javascript" type= "Text/javascript" >
<!--
Function default requirement parameter is numeric
function sum (a,b) {
A=parseint (a);
B=parseint (b);
Throws an exception object if a or B cannot be converted to a number
if (isNaN (a) | | isNaN (b)) {
throw new error ("Arguments are not numbers");
}
return a+b;
}

try{
The wrong call
var s=sum ("C", "D");
}catch (e) {
Show details of an exception
alert (e.message);
}
-->
</script>

Grammar:
Throw (Exception) exception can be a string, an integer, a logical value, or an object.