参考答案：
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<script>
var N = 50;
var m = 3;
var array = [];
for (var i = 0; i < N; i++) {
array[i] = i + 1;
}
loop(array, []);
function loop(arr1, arr2) {
var before = arr1.concat(arr2);
var after = [];
for (var i = ((arr2.length == 0) ? 0 : arr1.length); i < before.length; i++) {
if ((i + 1) % m != 0) {
after.push(before[i]);
}
}
if (after.length < 2) {
console.log("在原来的位置是: " + after.join());
} else {
loop(before, after);
}
}
</script>
</body>
</html>
在原来的位置是: 11