微信小程序实现走马灯效果实例

<view class="marquee">
 <text>这是一段滚动的文字</text>
</view>

@keyframes translation {
 from {
 margin-left: 750rpx; //从屏幕最右端开始
 }

 to {
 margin-left: 0px;
 }
}

.marquee{
 white-space: nowrap;
 animation-name: translation; //定义动画的名称
 animation-duration: 3s;
 animation-iteration-count: infinite;
 animation-timing-function: linear;
}

onReady: function () {
 let query = wx.createSelectorQuery();
 query.select('.marquee').boundingClientRect();
 query.exec((res) => {
  if (res[0]) {
  this.setData({
   marqueeWidth: res[0].width
  })
  }
 })
}

<view class="marquee" style="--marqueeWidth:-{{marqueeWidth}}px">
 <text>这是一段滚动的文字</text>
</view>

wxss样式里：
@keyframes translation {
 from {
 margin-left: 750rpx;
 }

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

<view class="marquee2" bindtransitionend="animationend" animation="{{animationData}}">
	<text>这是一段滚动的文字</text>
</view>

.marquee2{
 display: inline-block;
 white-space: nowrap;
 margin-left: 750rpx;
}

this.animation = wx.createAnimation({
 duration: 3000,
 timingFunction: 'linear'
});
var query = wx.createSelectorQuery();
query.select('.marquee2').boundingClientRect();
query.exec((res) => {
 if (res[0]) {
 this.setData({
  marqueeWidth: res[0].width //文字长度
 }, () => {
  this.doAnim()
 })
 }
})


doAnim: function () {
 //向左滚动到超出屏幕，这里临时写死的屏幕宽度375px
 this.animation.translate(-this.data.marqueeWidth - 375, 0).step();
 setTimeout(() => {
  this.setData({
  animationData: this.animation.export(),
  });
 }, 10)
}

animationend() {
 //复位
 this.animation.translate(0, 0).step({ duration: 0 });
 this.setData({
  animationData: this.animation.export()
 }, () => {
  //重新开始动画
  this.doAnim()
 });
}