原生小程序封装跑马灯效果

<view class="marquee_container " style="background:{{broadcast_arr.back_color}};font-size:32rpx;">
 <view class='marquee_text' style='--marqueeWidth--:{{-broadcast_arr.width_mal}}px;--speed--:{{broadcast_arr.time}}s;width:{{broadcast_arr.width_mal}}px;'>
 <block wx:for="{{data}}" wx:key='index'>
 <view style='color:{{broadcast_arr.text_color}};margin-left:{{index!=0?item.starspos*2:0}}rpx;'>
 {{item.img}}
 </view>
 </block>
 </view>
</view>

@keyframes around {
 from {
 margin-left: 100%;
 }

 to {
 margin-left: var(--marqueeWidth--);
 }
}

.marquee_container {
 /* background-color: #0099FF; */
 padding: 12rpx 0;
 position: relative;
 width: 100%;
 /* height: 50rpx; */

}

.marquee_text {
 display: flex;
 white-space: nowrap;
 animation-name: around;
 animation-duration: var(--speed--);
 animation-iteration-count: infinite;
 animation-timing-function: linear;
 line-height: 50rpx;
}

.marquee_tit {
 height: 50rpx;
 line-height: 50rpx;
 position: absolute;
 padding-left: 22rpx;
}

Component({
 options: {
 multipleSlots: true // 在组件定义时的选项中启用多slot支持
 },
 properties: {
 title: {   // 属性名
  type: String,  // 类型（必填），目前接受的类型包括：String, Number, Boolean, Object, Array, null（表示任意类型）
  value: '标题' , // 属性初始值（可选），如果未指定则会根据类型选择一个
  observer: function (newVal) {
  this.setData({
   'data[0].img': newVal
  })
  this.run()
  }
 }
 },
 data: {
 data: [
  {
  img: "",
  }
 ],
 broadcast_arr: {
  speed: 5, //滚动速度，每秒5个字
  font_size: "16", //字体大小(px)
  text_color: "#de8c17", //字体颜色
  back_color: "#fffbe8", //背景色
 }
 },

 /**
 * 生命周期函数--监听页面加载
 */
 methods: {
 run() {
  let ititdata = this.data.data,
  assist = this.data.broadcast_arr,
  this_width = 0,
  spacing = 0,
  speed = (this.data.broadcast_arr.speed * this.data.broadcast_arr.font_size); //m每秒行走的距离

  for (let i in ititdata) {
  ititdata[i].starspos = wx.getSystemInfoSync().windowWidth; //以取屏幕宽度为间距
  this_width += (ititdata[i].img.length-12) * this.data.broadcast_arr.font_size;
  if (i != ititdata.length - 1) {
   spacing += ititdata[i].starspos
  }
  }
  let total_length = this_width + spacing;//总长
  assist.time = total_length / speed; /**滚动时间*/
  assist.width_mal = total_length;
  this.setData({
  broadcast_arr: assist,
  data: ititdata
  })
 }
 }
})

{
 "usingComponents": {
 "marquee":"/components/Marquee/Marquee"
 },

<!--跑马灯 Linyufan.com-->
 <marquee id='marquee' title='江龙：每日惠自提店铺特价啦~店铺特价啦~店铺特价啦~'></marquee>
<!--跑马灯-->

onReady:function(){
 this.marquee=this.selectComponent('#marquee')
 this.marquee.run()
 },