this.$nextTick(() => {
document.body.addEventListener("touchmove", this.addBodyTouchEvent, {
passive: false
});
});

touchstart(e) {
this.previewScrollTop = e.touches[0].pageY;
},
touchend(e) {
let distance = e.changedTouches[0].pageY - this.PReviewScrollTop;
if (Math.abs(distance) <= 10) {
return false;
}
//距离太短时不滚动
let dom = this.$refs.editor.$el.getElementsByclassname("ql-editor")[0],
maxHeight = Math.max(0, dom.scrollHeight - dom.clientHeight), //最大高度范围
tempData = this.scrollTop + (distance >= 0 &#63; -60 : 60); //计算应该高度数据
if (tempData >= maxHeight) {
this.scrollTop = maxHeight;
dom.scrollTop = this.scrollTop;
} else if (tempData <= 0) {
this.scrollTop = 0;
dom.scrollTop = this.scrollTop;
} else {
this.scrollTop = tempData;
dom.scrollTop = this.scrollTop;
}
}

/**
* 动画垂直滚动到页面指定位置
* @param { } dom element对象
* @param { Number } currentY 当前位置
* @param { Number } targetY 目标位置
*/
export function scrollAnimation(dom, currentY, targetY) {
// 计算需要移动的距离
let needScrollTop = targetY - currentY;
let _currentY = currentY;
setTimeout(() => {
// 一次调用滑动帧数，每次调用会不一样
const dist = Math.ceil(needScrollTop / 10);
_currentY += dist;
dom.scrollTo(_currentY, currentY);
// 如果移动幅度小于十个像素，直接移动，否则递归调用，实现动画效果
if (needScrollTop > 10 || needScrollTop < -10) {
scrollAnimation(dom, _currentY, targetY);
} else {
dom.scrollTo(_currentY, targetY);
}
}, 1);
}

touchend(e) {
let distance = e.changedTouches[0].pageY - this.previewScrollTop;
if (Math.abs(distance) <= 10) {
return false;
}
//距离太短时不滚动
let dom = this.$refs.editor.$el.getElementsByClassName("ql-editor")[0],
maxHeight = Math.max(0, dom.scrollHeight - dom.clientHeight), //最大高度范围
tempData = this.scrollTop + (distance >= 0 ? -60 : 60); //计算应该高度数据
if (tempData >= maxHeight) {
this.scrollTop = maxHeight;
dom.scrollTop = this.scrollTop;
} else if (tempData <= 0) {
this.scrollTop = 0;
dom.scrollTop = this.scrollTop;
} else {
this.scrollTop = tempData;
scrollAnimation(dom, 0, this.scrollTop);
}
}

let dom = this.$refs.editor.$el.getElementsByClassName("ql-editor")[0]；