Tryit Editor v2.9

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<!DOCTYPE html>
<html>
<body>

<p>Click the button to loop through the indices of an array, in descending order.</p>

<button onclick="myFunction()">Try it</button>

<p id="demo"></p>

<script>
function myFunction() {
    var cars = ["BMW", "Volvo", "Saab", "Ford"];
    var text = "";
    var i;
    for (i = cars.length - 1; i >= 0; i--) {
        text += cars[i] + "<br>";
    }

    document.getElementById("demo").innerHTML = text;
}
</script>

</body>
</html>