please，add -webkit-overflow-scrolling：touch; 到 #overlay 元素。

并在body标签的末尾添加此javascript代码：

And add please this javascript code at the end of the body tag:

(function () {
    var _overlay = document.getElementById('overlay');
    var _clientY = null; // remember Y position on touch start

    _overlay.addEventListener('touchstart', function (event) {
        if (event.targetTouches.length === 1) {
            // detect single touch
            _clientY = event.targetTouches[0].clientY;
        }
    }, false);

    _overlay.addEventListener('touchmove', function (event) {
        if (event.targetTouches.length === 1) {
            // detect single touch
            disableRubberBand(event);
        }
    }, false);

    function disableRubberBand(event) {
        var clientY = event.targetTouches[0].clientY - _clientY;

        if (_overlay.scrollTop === 0 && clientY > 0) {
            // element is at the top of its scroll
            event.preventDefault();
        }

        if (isOverlayTotallyScrolled() && clientY < 0) {
            //element is at the top of its scroll
            event.preventDefault();
        }
    }

    function isOverlayTotallyScrolled() {
        // https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollHeight#Problems_and_solutions
        return _overlay.scrollHeight - _overlay.scrollTop <= _overlay.clientHeight;
    }
}())

我希望它可以帮到你。