【报Bug】nvue页面元素touchmove在安卓系统下滑动是异常抖动

示例代码：

<template>  
    <view class="live-camera" :style="{ width: windowWidth, height: windowHeight }">  
        <view class="preview" :style="{ width: windowWidth, height: windowHeight}">  
            <live-pusher  
                id="livePusher"  
                ref="livePusher"  
                class="livePusher"  
                mode="FHD"  
                beauty="0"  
                whiteness="0"  
                :aspect="aspect"  
                min-bitrate="1000"  
                audio-quality="16KHz"  
                :device-position="devicePosition"  
                remote-mirror="false"  
                :auto-focus="true"  
                :muted="true"  
                :enable-camera="true"  
                :enable-mic="false"  
                :zoom="false"  
                :style="{ width: windowWidth, height: windowHeight }"  
            ></live-pusher>  
            <!--提示语-->  
            <cover-view class="add-remind">  
                <text class="remind-text" @click="showIcon=true">添加水印</text>  
            </cover-view>  
            <!-- 可添加水印列表 -->  
            <cover-view class="icon-list" v-if="showIcon">  
                <image v-for="(item,index) in iconList"  class="icon-img" :src="item.img" :key="index" @click="addWatermark(item, index)"></image>  
            </cover-view>  
            <!-- 已添加水印列表 -->  
            <template v-for="(item,index) in activeIcon" >  
                <view class="active-icon-img-wrap" :key="index" :style="{ top: item.moveY+'px', left: item.moveX+'px' }" @touchstart="dragStart(index,$event)"  @touchmove.stop="dragMove(index,$event)">  
                    <image class="active-icon-img" :src="item.img" ></image>  
                </view>   
            </template>  
        </view>  
        <!--底部菜单区域背景-->  
        <view class="menu">  
            <cover-image class="menu-mask" src="../../static/image/watermark/bar.png"></cover-image>  

            <!--返回键-->  
            <cover-image class="menu-back" @tap="back" src="../../static/image/watermark/back.png"></cover-image>  

            <!--快门键-->  
            <cover-image class="menu-snapshot" @tap="snapshot" src="../../static/image/watermark/shutter.png"></cover-image>  

            <!--反转键-->  
            <cover-image class="menu-flip" @tap="flip" src="../../static/image/watermark/flip.png"></cover-image>  
        </view>  
    </view>  
</template>  

<script>  
let _this = null;  
export default {  
    data() {  
        return {  
            dotype:'watermark',  
            devicePosition: 'back', // 前后摄像头  
            message:'live-camer',//水印内容  
            aspect: '2:3', //比例  
            windowWidth: '', //屏幕可用宽度  
            windowHeight: '', //屏幕可用高度  
            camerastate: false, //相机准备好了  
            livePusher: null, //流视频对象  
            snapshotsrc: null, //快照  
            iconList:[  
                { img: '/static/image/flower.png', moveX: 20, moveY: 80, delShow: false },  
                { img: '/static/image/flowerS.png', moveX: 20, moveY: 120, delShow: false  },  
                { img: '/static/image/home.png', moveX: 20, moveY: 160, delShow: false  },  
                { img: '/static/image/homeS.png', moveX: 20, moveY: 200, delShow: false  },  
            ],  
            activeIcon: [],  
            moveStart: [0,0], // 水印被拖动时的初始位置  
            showIcon: false, // 是否显示可添加水印列表  
            systemInfo: {},  
            moveOver: false  

        };  
    },  
    onShow(e) {  
        if(this.livePusher) {  
            this.initData()  
            this.startPreview()  
        }  
    },  
    onReady() {  
        console.log('ready')  
        _this = this;  
        this.livePusher = uni.createLivePusherContext('livePusher', this);  
        uni.getSystemInfo({  
            success: function(res) {  
                _this.systemInfo = res  
                _this.devicePosition = _this.systemInfo.platform == 'ios' ? 'front' : 'back'  
            }  
        });  
        this.initCamera();  
        setTimeout(()=> {  
            this.startPreview(); //开启预览并设置摄像头  
        },50)  
    },  
    methods: {  
        //初始化相机  
        initCamera() {  
            this.windowWidth = this.systemInfo.windowWidth;  
            this.windowHeight = this.systemInfo.windowHeight;  
            let zcs = this.aliquot(this.windowWidth, this.windowHeight);  
            this.aspect = this.windowWidth / zcs + ':' + this.windowHeight / zcs;  
        },  

        // 图片页面返回初始化数据  
        initData() {  
            this.activeIcon = []  
            this.showIcon = false  
        },  

        //整除数计算  
        aliquot(x, y) {  
            if (x % y == 0) return y;  
            return this.aliquot(y, x % y);  
        },  

        //开始预览  
        startPreview() {  
            this.livePusher.startPreview({  
                success: a => {  
                    // ios默认前置摄像头，反转它  
                    console.log(this.devicePosition == 'front')  
                    if(this.systemInfo.platform == 'ios' && this.devicePosition == 'front') this.flip()  
                },  
                fail: err => {  
                    console.log(err);  
                },  
                complete(data) {  
                    console.log(data)  
                }  
            });  
        },  

        //停止预览  
        stopPreview() {  
            this.livePusher.stopPreview({  
                success: a => {  
                    _this.camerastate = false; //标记相机未启动  
                }  
            });  
        },  

        //返回  
        back() {  
            uni.navigateBack();  
        },  

        //抓拍  
        snapshot() {  
            this.livePusher.snapshot({  
                success: e => {  
                    _this.snapshotsrc = e.message.tempImagePath;  
                    _this.stopPreview();  
                    // 先将临时文件保存到本地  否则canvas画完输出ios有安全问题  
                    uni.saveFile({  
                        tempFilePath: e.message.tempImagePath,  
                        success: (res) => {  
                            uni.setStorageSync('canvasPreview', { path: res.savedFilePath, iconInfo: _this.activeIcon, devicePosition: this.devicePosition })  
                        }  
                    });  
                    uni.navigateTo({  
                        url: '/pages/test/waterPreview'  
                    })  
                }  
            });  
        },  

        //反转  
        flip() {  
            this.livePusher.switchCamera();  
            this.devicePosition = this.devicePosition == 'front' ? 'back' : 'front'  
            console.log(this.devicePosition)  
        },  
        // 添加水印  
        addWatermark(item) {  
            let data = JSON.parse(JSON.stringify(item))  
            this.activeIcon = this.activeIcon.concat(data)  
        },  
        // 开始拖动  
        dragStart(index,event) {  
            // console.log(this.activeIcon[index].moveX,event.touches[0])  
            // this.activeIcon[index].moveX = event.touches[0].pageX  
            // this.activeIcon[index].moveY = event.touches[0].pageY  
            // console.log(this.activeIcon[index].moveX)  
        },  
        // 托动  
        dragMove(index,event){  
            let tag = event.touches;  
            if(tag[0].pageX < 0 ){  
                tag[0].pageX = 0  
            }  
            if(tag[0].pageY < 0 ){  
                tag[0].pageY = 0  
            }  
            if(tag[0].pageX > this.windowWidth ){  
                tag[0].pageX = this.windowWidth  
            }  
            if(tag[0].pageY > this.windowHeight ){  
                tag[0].pageY = this.windowHeight  
            }  
            this.activeIcon[index].moveX  = tag[0].pageX;  
            this.activeIcon[index].moveY  = tag[0].pageY;  
        },  
    }  
};  
</script>  

<style lang="scss">  
    .live-camera {  
        justify-content: center;  
        align-items: center;  
        position: relative;  
        height: 100vh;  
    }  

    .menu {  
        position: absolute;  
        left: 0;  
        bottom: 0;  
        width: 750rpx;  
        height: 180rpx;  
        z-index: 98;  
        align-items: center;  
        justify-content: center;  
    }  

    .menu-snapshot {  
        width: 130rpx;  
        height: 130rpx;  
        z-index: 99;  
    }  

    .menu-mask {  
        position: absolute;  
        left: 0;  
        bottom: 0;  
        width: 750rpx;  
        height: 180rpx;  
        z-index: 98;  
    }  

    .menu-back {  
        position: absolute;  
        left: 30rpx;  
        bottom: 50rpx;  
        width: 80rpx;  
        height: 80rpx;  
        z-index: 99;  
        align-items: center;  
        justify-content: center;  
    }  

    .menu-flip {  
        position: absolute;  
        right: 30rpx;  
        bottom: 50rpx;  
        width: 80rpx;  
        height: 80rpx;  
        z-index: 99;  
        align-items: center;  
        justify-content: center;  
    }  

    .preview {  
        justify-content: center;  
        align-items: center;  
    }  

    .add-remind {  
        position: absolute;  
        top: 20rpx;  
        right: 20rpx;  
        z-index: 100;  
    }  

    .remind-text {  
        color: #dddddd;  
        font-size: 28rpx;  
        // text-shadow: #fff 1px 0 0, #fff 0 1px 0, #fff -1px 0 0, #fff 0 -1px 0;  
    }  

    .icon-list {  
        height: 100rpx;  
        display: flex;  
        // background-color: rgba($color: #000000, $alpha: 0.1);  
        flex-direction: row;  
        align-items: center;  
        position: absolute;  
        bottom: 180rpx;  
        left: 0;  
        right: 0;  
    }  

    .icon-img {  
        height: 80rpx;  
        width: 80rpx;  
        margin-right: 20rpx;  
    }  

    .active-icon-img-wrap {  
        height: 80rpx;  
        width: 80rpx;;  
        position: absolute;  
        z-index: 100;  
    }  

    .active-icon-img {  
        height: 80rpx;  
        width: 80rpx;  
    }  

    .iconfont {  
        width: 30rpx;  
        height: 30rpx;  
        border-radius: 15rpx;  
        position: absolute;  
        background-color: #ccc;  
        top: 0;  
        right: 0;  
    }  

    .snapshotsrc-wrap {  
        width: 100vw;  
        height: 100vh;  
    }  

</style>  

操作步骤：

生成水印后拖动异常跳动

预期结果：

正常跟随手指移动

实际结果：

异常跳动