微信小程序实现文字从右向左无限滚动

<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>

.container {height: 100%;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;}

Page({ /**  * 页面的初始数据  * Linyufan.com  */ data: {  text: "这是一条测试公告，看看效果怎么样，2019年3月23日",  marqueePace: 1,//滚动速度  marqueeDistance: 0,//初始滚动距离  marquee_margin: 30,  size:14,  interval: 20 // 时间间隔 },  /**  * 生命周期函数--监听页面加载  */ onLoad: function (options) {  }, onShow: function () {  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 },  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  if (length > windowWidth){   var interval = 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 {     //console.log("替换");     that.setData({      marqueeDistance: 0 // 直接重新滚动     });     clearInterval(interval);     that.scrolltxt();    }   }, that.data.interval);  }  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  }  }})