scroll-view在设置了scroll-y以及scroll-into-view之后，每次数据增加就自动滚动到最后一个item，item设置bindlongpress，自动滚动停止以后，长按item无法触发监听事件；当手动滚动scroll-view内部之后，长按item可以触发监听事件，demo代码：

<scroll-view class="scroll_view" scroll-into-view="{{scrollIntoView}}" scroll-y>

    <view

        wx:for="{{scrollList}}"

        wx:key="{{item.id}}"

        bindlongpress="longpress"

        id="item_{{item.id}}"

        class="item"

    >

        {{item.cnt}}

    </view>

</scroll-view>

Page({

    data: {

        scrollList: [],

        scrollIntoView: ''

    },

    onReady() {

        this.startTestScroll();

    },

    startTestScroll() {

        const that = this;

        const { scrollList } = this.data;

        const time = new Date().getTime();

        const item = {

            id: time,

            cnt: time

        };

        scrollList.push(item);

        that.setData({

            scrollList,

            scrollIntoView: 'item_' + item.id

        });