最后，我得到它的工作。真的很简单：

Finally, I got it to work. Really simple:

var $scroller = $("#scroller");
$scroller.bind('touchstart', function (ev) {
    var $this = $(this);
    var scroller = $scroller.get(0);

    if ($this.scrollTop() === 0) $this.scrollTop(1);
    var scrollTop = scroller.scrollTop;
    var scrollHeight = scroller.scrollHeight;
    var offsetHeight = scroller.offsetHeight;
    var contentHeight = scrollHeight - offsetHeight;
    if (contentHeight == scrollTop) $this.scrollTop(scrollTop-1);
});