<button id="btn" value="Click">Click</button>
    <script type="text/javascript">
        var btn = document.getElementById("btn");
        var h;
        var isLongTouch = false;
        btn.onmousedown = function () {
            isLongTouch = false;
            h = setTimeout(function () {
                isLongTouch = true;
                console.warn("hello");
            }, 5000);
        }
        btn.onclick = function () {
            if (isLongTouch === false)
                confirm("Ok or No?");
        }
        btn.onmouseup = function () {
            if (h != null) {
                clearTimeout(h);
            }
        }
    </script>