var list    = [1, 2, 3],
    newList = list;
list.reverse();
console.log(newList); // [3, 2, 1]

// ~ OR ~

var list    = [1, 2, 3],
    newList = list;
setTimeout(function () { list.reverse(); }, 0);
console.log(newList); // [1, 2, 3]