[рони]

ytil,

<script>
function makeRand(num) {
    var usedNumbers = [num--];
    !function f() {
        var i = Math.round(Math.random() * usedNumbers.length);
        usedNumbers.splice(i,0,num--);
        num && f()
    }();
    return usedNumbers;
}

var arr = makeRand(100);

document.write(arr)
  </script>