<!DOCTYPE html>
<html>
<body>
<p>In this example we can able to check the index value of largest array value</p>
<script>
var marks = [30, 100, 50, 90, 40];
function IndexValueOfALargestArrayValue(array){
var startingValue = 1;
var maximumValue = 0;
for(startingValue; startingValue < array.length; startingValue++){
if(array[maximumValue] < array[startingValue]){
maximumValue = startingValue;
}
}
return maximumValue;
}
document.write("The largest Number Index value is:" +IndexValueOfALargestArrayValue(marks));
</script>
</body>
</html>