js-exhaustive method (y0h)_javascript skills

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]<script> function FStr(oStr,Num){ for(var i=0 ;i<Math.pow(oStr.length,Num);i++){ var x=i document.write(i+":") for(var j=0;j<Num;j++){ document.write(oStr.substr((x%oStr.length),1)) x=parseInt(x/oStr.length) } document.write(" ") } } FStr("abcdefs",3) </script>