小程序全屏滚动效果的实现(源码分享)

想做一个全屏滚动的效果，于是在网上找了一个差不多的例子，但是觉得有些地方不是很好，于是改进了一下；

先上效果：

代码：

wxml:

　　　<!-- 第一页 -- >
　　<view id='hook1' class="section section01 {{scrollindex==0?'active':''}}" style='background:red' bindtouchstart="scrollTouchStart" bindtouchmove='scrollTouchMove' bindtouchend="scrollTouchEnd">
            <view class='cont'>
                <view class='cont-body'>
                    <view>one</view>
                </view>
            </view>
        </view>
        <!-- 第二页 -->
        <view id='hook2' class="section section02 {{scrollindex==1?'active':''}}" style='background:pink' bindtouchstart="scrollTouchStart" bindtouchmove='scrollTouchMove' bindtouchend="scrollTouchEnd">
            <view class='cont'>
                <view class='cont-body'>
                    <view>two</view>
                </view>
            </view>
        </view>
        <!-- 第三页 -->
        <view id='hook3' class="section section03 {{scrollindex==2?'active':''}}" style='background:blue' bindtouchstart="scrollTouchStart" bindtouchmove='scrollTouchMove' bindtouchend="scrollTouchEnd">
            <view class='cont'>
                <view class='cont-body'>
                    <view>three</view>
                </view>
            </view>
        </view>
        <!-- 第四页 -->
        <view id='hook4' class="section section04 {{scrollindex==3?'active':''}}" style='background:green' bindtouchstart="scrollTouchStart" bindtouchmove='scrollTouchMove' bindtouchend="scrollTouchEnd">
            <view class='cont'>
                <view class='cont-body'>
                    <view>foure</view>
                </view>
            </view>
        </view>

wxss:

page {
    height: 100%;
    background: fff;
    color: #282828;
}

.container {
    flex: 1;
    flex-direction: column;
    box-sizing: border-box;
    padding: 0;
    align-items: initial;
    justify-content: first baseline;
}

.container-fill {
    height: 100%;
    overflow: hidden;
}

.scroll-fullpage {
    height: 100%;
}

.section {
    height: 100%;
}

.cont {
    width: 100%;
    height: 100%;
    margin: 0 auto;
    position: relative;
}

.cont .cont-body {
    width: 75%;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

js:

Page({

    /**
     * 页面的初始数据
     */
    data: {
        　 scrollindex: 0, // 当前页面的索引值
        　　　　totalnum: 4, // 总共页面数
        　　　　starty: 0, // 开始的位置x
        　　　　startTime: 0,   // 开始的时间戳
        　　　　endy: 0, // 结束的位置y
        　　　　endTime: 0,   // 结束的时间戳
        　　　　critical: 80, // 触发翻页的临界值
        　　　　maxTimeCritical: 300,   // 滑动的时间戳临界值上限
        　　　　minTimeCritical: 100,   // 滑动的时间戳临界值下限
        　　　　margintop: 0, // 滑动下拉距离

        　 currentTarget: null,   // 当前点击的元素的id
    },

    scrollTouchStart: function(e) {
        let py = e.touches[0].pageY,
            stamp = e.timeStamp,
            currentTarget = e.currentTarget.id;
        console.log(py);
        this.setData({
            starty: py,
            startTime: stamp,
            currentTarget: currentTarget
        })
    },

    scrollTouchMove(e) {
        // console.log(e);
    },

    scrollTouchEnd: function(e) {
        let py = e.changedTouches[0].pageY,
            stamp = e.timeStamp,
            d = this.data,
            timeStampdiffer = stamp - d.startTime;
        this.setData({
            endy: py,
            endTime: stamp
        })
        console.log('开始：' + d.starty, '结束：' + e.changedTouches[0].pageY);
        console.log('时间戳之差: ' + timeStampdiffer);

        if (timeStampdiffer <= d.maxTimeCritical && timeStampdiffer > d.minTimeCritical && (d.starty > e.changedTouches[0].pageY)) {
            let currentTarget = parseInt(d.currentTarget.slice(4)),
                nextTarget = currentTarget + 1;
            const query = wx.createSelectorQuery();
            query.select(`#hook${nextTarget}`).boundingClientRect();
            query.selectViewport().scrollOffset();
            query.exec(function (res) {
                // console.log(res);
                　　  　　if (res[0] != null) {
                    wx.pageScrollTo({
                        scrollTop: res[0].height * currentTarget,
                    })
                }
            })
        　　} else if (timeStampdiffer <= d.maxTimeCritical && timeStampdiffer > d.minTimeCritical && (d.starty < e.changedTouches[0].pageY)) {   // 下拉
            let currentTarget = parseInt(d.currentTarget.slice(4)),
                preTarget = currentTarget - 2 == -1 ? 0 : currentTarget - 2;

            　　const query = wx.createSelectorQuery();
            　　query.select(`#hook1`).boundingClientRect();
            　　query.selectViewport().scrollOffset();
            　　query.exec(function (res) {
                　　console.log(res);
                　　wx.pageScrollTo({
                    　　scrollTop: res[0].height * preTarget
                　　})
            　　})
        　　}        
    　},
})