Hello, Just Check in Console it Works
var str,i,counter="";
for (i = 5 ; i >= 1; i--) {
str =i+',';
console.log(str);
counter+=str;
}
console.log(counter.replace(/.$/,""));
//console.log(counter.substring(0,counter.length-1));
And in future, please do not remove messages as you have done here. We all get things wrong from time to time (me more often), so just be adult enough to accept correction.