Convert string to char Array using JavaScript

<input type="button" onclick="CharArray()" value="To Array" />
<span id="spnName">ADNAAN</span>
<script>
    function CharArray() {
        var name = document.getElementById("spnName").innerHTML;
        var chars = name.split('');
        name = '';
        for (var i = 0; i < chars.length; i++) {
            name += chars[i] + "-";
        }
        name = name.substring(0, name.length - 1);
        document.getElementById("spnName").innerHTML = name;
    };
</script>