微信小程序實現無縫滾動

<view class="wrap-item" style='transform:translateX({{posLeft2}}px)'>
  <view class="messages-scroll firstScroll">
   <view class="{{index == 0?'yanse items':'items'}}" wx:for="{{zhuli}}" wx:key="index">
   <image wx:if="{{index == 0}}" src="../../images/xiangq_yonhu_icon_p.png"></image>
   <image wx:if="{{index != 0}}" src="../../images/xiangq_yonhu_icon_n.png"></image>
   <view>{{index}}{{item.ip}}{{item.str}}</view>
   </view>
  </view>

  <view class="messages-scroll secondScroll" style='transform:translateX({{marginLeft}}px)'>
   <view class="{{index == 0?'yanse items':'items'}}" wx:for="{{zhuli}}" wx:key="index">
   <image wx:if="{{index == 0}}" src="../../images/xiangq_yonhu_icon_p.png"></image>
   <image wx:if="{{index != 0}}" src="../../images/xiangq_yonhu_icon_n.png"></image>
   <view>{{item.ip}}{{item.str}}</view>
   </view>
  </view>
</view>

onShow(){
let windowWidth = wx.getSystemInfoSync().windowWidth; //屏幕寬度
wx.createSelectorQuery().select('.firstScroll').boundingClientRect(function (rect) {
  let txtLength = rect.width;//文字+圖標長度
  console.log(txtLength)
  console.log(rect)
  // that.setData({
  // marginLeft: txtLength < windowWidth - that.data.marginLeft ? windowWidth - txtLength : that.data.marginLeft
  // })
  console.log(that.data.marginLeft)
  that.roll2(that, txtLength, windowWidth); //調用滾動方法
 }).exec()
},

roll2: function (that, txtLength, windowWidth) {
 var interval2 = setInterval(function () {
 if (-that.data.posLeft2 < txtLength) {
 that.setData({
 posLeft2: that.data.posLeft2 - that.data.pace
 })
 } else { // 第二段文字滾動到左邊後重新滾動
 that.setData({
 posLeft2: 0
 })
 clearInterval(interval2);
 that.roll2(that, txtLength, windowWidth);
 }
 }, 20)
},

.wrap-item{
position: relative;
z-index: 10;
display: flex;
white-space: nowrap;
}

.brand-info .messages-scroll {
display: flex;
white-space: nowrap;

margin-top: 148rpx;
}

.brand-info .messages-scroll .items {
display: flex;
white-space: nowrap;
box-sizing: border-box;
padding: 0 10rpx;
margin-left: 10rpx;
align-items: center;
/* width: 332rpx; */
height: 50rpx;
background: rgba(0, 0, 0, 0.2);
border-radius: 25rpx;
color: #99A4BA;
}

.yanse{
color: #C4FFFD !important;
}

.brand-info .messages-scroll .items image {
width: 26rpx;
height: 22rpx;
margin-right: 10rpx;
}

.brand-info .messages-scroll .items view {
font-size: 24rpx;
font-family: Source Han Sans CN;
font-weight: 400;
}