效果如图

WXML

<scroll-view class="container">  <view class="scrolltxt">    <view class="marquee_box">      <view class="marquee_text" style="transform: translateX(-{{marqueeDistance}}px)">        <text>{{text}}</text>        <text style="margin-right:{{marquee_margin}}px;"></text>        <text style="margin-right:{{marquee_margin}}px;">{{text}}</text>              </view>    </view>  </view></scroll-view>

WXSS

.container {display: flex;flex-direction: column;justify-content: space-between;box-sizing: border-box;}.scrolltxt{padding:0 20rpx;background:#f8f8f8;}.marquee_box {position:relative;color:#333;height:90rpx;display:block;overflow:hidden;} .marquee_text {white-space: nowrap;position:absolute;top:0;font-size:14px;height:90rpx;line-height:90rpx;}

JS

  data: {    //滚动字幕    text: "温馨提示：为了保证其他购买者的利益，每个 账号针对同一商品只允许退款一次，请您谨慎操作。",    marqueePace: 1,//滚动速度    marqueeDistance: 0,//初始滚动距离    marquee_margin: 30,//间距    size: 14,//字号   time: '',// 定时器  },onHide: function () {    //清空滚动字幕定时器，避免锁屏或页面隐藏后移动速度越来越快    clearInterval(this.data.time);  },  onShow: function (e) {    var that = this;    var length = that.data.text.length * that.data.size;//文字长度    var windowWidth = wx.getSystemInfoSync().windowWidth;// 屏幕宽度    //console.log(length,windowWidth);    that.setData({      length: length,      windowWidth: windowWidth    });    that.scrolltxt();// 第一个字消失后立即从右边出现  }, /**   * 滚动字幕   */  scrolltxt: function () {    var that = this;    var length = that.data.length;//滚动文字的宽度    var windowWidth = that.data.windowWidth;//屏幕宽度    var time = this.data.time    if (length > windowWidth) {      time = setInterval(function () {        var maxscrollwidth = length + that.data.marquee_margin;//滚动的最大宽度，文字宽度+间距，如果需要一行文字滚完后再显示第二行可以修改marquee_margin值等于windowWidth即可        var crentleft = that.data.marqueeDistance;        if (crentleft < maxscrollwidth) {//判断是否滚动到最大宽度          that.setData({            marqueeDistance: crentleft + that.data.marqueePace          })        }        else {          that.setData({            marqueeDistance: 0 // 直接重新滚动          });          clearInterval(time);          that.scrolltxt();        }      }, 20);    }    else {      that.setData({ marquee_margin: "1000" });//只显示一条不滚动右边间距加大，防止重复显示    }    that.setData({      time:time    })  },