Need javascript code for button press and hold

by 
function holdit(btn, action, start, speedup) {
    var t;

    var repeat = function () {
        action();
        t = setTimeout(repeat, start);
        start = start / speedup;
    }

    btn.mousedown = function() {
        repeat();
    }

    btn.mouseup = function () {
        clearTimeout(t);
    }
};

/* to use */
holdit(btn, function () { }, 1000, 2); /* x..1000ms..x..500ms..x..250ms..x */

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