scrollTop的bug

[wangbagang]

当我手动滑动的距离大于50px的时候，监听panend调用xscroll.scrollTop('-' + 400, 400, 'ease-in-out')以后，再次触摸的时候会跳一下，查看源码得知：
if (boundryCheck) { //over top y = y > boundry.top ? bounce ? (y - boundry.top) * PAN_RATE + boundry.top : boundry.top : y; //over bottom y = y < boundry.bottom - containerHeight ? bounce ? y + (boundry.bottom - containerHeight - y) * PAN_RATE : boundry.bottom - containerHeight : y; //over left x = x > boundry.left ? bounce ? (x - boundry.left) * PAN_RATE + boundry.left : boundry.left : x; //over right x = x < boundry.right - containerWidth ? bounce ? x + (boundry.right - containerWidth - x) * PAN_RATE : boundry.right - containerWidth : x; }
在这里判断有问题。boundry的值是触摸的位置，应该是scrollTop最后的位置，所以导致会跳一下。希望解决，下面是我的代码
` var xscroll = new XScroll({
renderTo:"#dayContainer",
lockY:false,
scrollbarY:false
});
xscroll.render();
xscroll.on('scroll', function (scroll) {
$('.history-cala').css({
opacity: Math.abs(scroll.scrollTop/$('.history-cala').outerHeight(true))
})
})

var startY = 0;
xscroll.on('panend', function (e) {
    var top = xscroll.getScrollTop();
    var diff = top - startY;
    console.log(diff + '...' + top)
    if(Math.abs(diff) > 30){
        if(diff < 0){
            xscroll.scrollTop('-' + $('.history-cala').outerHeight(true), 400, 'ease-in-out')
        } else {
            xscroll.scrollTop(0, 400, 'ease-in-out')
        }
        setTimeout(function () {
            xscroll.init()
        }, 400)
    }
})

xscroll.on('panstart', function (e) {
    startY = xscroll.getScrollTop()
})`