微信小程序实现简单跑马灯效果

<!-- 跑马灯效果 -->
 <view class="example">
 <view class="marquee_box">
 <view class="marquee_text" style="{{orientation}}:{{marqueeDistance}}px;font-size: {{size}}px;">
  <image src="{{adUrl}}" class='ad-image' />{{text}}
 </view>
 </view>
 </view>

.example {
 display: block;
 width: 100%;
 height: 70rpx;
 background-color: #f2f2f2;
 line-height: 70rpx;
}

.marquee_box {
 width: 100%;
 position: relative;
}

.marquee_text {
 white-space: nowrap;
 position: absolute;
 : 0;
 display: flex;
 flex-direction: row;
}

.ad-image {
 width: 40rpx;
 height: 40rpx;
 margin-right: 10rpx;
 margin-: 15rpx;
}

Page({
 data: {
 text: '51淘甄貨,一个可以省钱的购物平台',
 marqueePace: 1,//滚动速度
 marqueeDistance: 0,//初始滚动距离
 size: 14,
 orientation: 'left',//滚动方向
 interval: 20, // 时间间隔
 adUrl: '../../images/ic_home_msg.png',
 },
 onShow: function () {
 // 页面显示
 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
 that.setData({
 length: length,
 windowWidth: windowWidth,
 });
 that.runMarquee();// 水平一行字滚动完了再按照原来的方向滚动
 },
 runMarquee: function () {
 var that = this;
 var interval = setInterval(function () {
 //文字一直移动到末端
 if (-that.data.marqueeDistance < that.data.length) {
 that.setData({
  marqueeDistance: that.data.marqueeDistance - that.data.marqueePace,
 });
 } else {
 clearInterval(interval);
 that.setData({
  marqueeDistance: that.data.windowWidth
 });
 that.runMarquee();
 }
 }, that.data.interval);
 }
})

setInterval(function(){
console.log("interval")
},1000)