We would like to know how to upperCase certain char-index in a string.
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
<!-- w ww. j a va2 s.c om-->
var str = 'post';
var arr =[0,2];
str = str.split("");
for(i = 0; i < arr.length; i++){
str[arr[i]]=str[arr[i]].toUpperCase();
}
str = str.join('');
document.writeln(str);
</script>
</head>
<body>
</body>
</html>
The code above is rendered as follows: