위 챗 애플 릿 이 문자 주마등 효 과 를 실현 하 다.

<view>1        </view>
<view class="example">
 <view class="marquee_box">
 <view class="marquee_text" style="{{orientation}}:{{marqueeDistance}}px;font-size: {{size}}px;">
 {{text}}
 </view>
 </view>
</view>
<view>2         </view>
<view class="example">
 <view class="marquee_box">
 <view class="marquee_text" style="{{orientation}}:{{marqueeDistance2}}px;font-size: {{size}}px;">
 <text>{{text}}</text>
 <text wx:if="{{marquee2copy_status}}" style="margin-left:{{marquee2_margin}}px;">{{text}}</text>
 </view>
 </view>
</view>

.example {
 display: block;
 width: 100%;
 height: 100rpx;
}

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

.marquee_text {
 white-space: nowrap;
 position: absolute;
 top: 0;
}

// pages/home/marquee/marquee.js
Page({
 data: {
 text: '                    ，        ',
 marqueePace: 1,//    
 marqueeDistance: 0,//      
 marqueeDistance2: 0,
 marquee2copy_status: false,
 marquee2_margin: 60,
 size: 14,
 orientation: 'left',//    
 interval: 20 //     
 },
 onShow: function () {
 //     
 var vm = this;
 var length = vm.data.text.length * vm.data.size;//    
 var windowWidth = wx.getSystemInfoSync().windowWidth;//     
 vm.setData({
 length: length,
 windowWidth: windowWidth,
 marquee2_margin: length < windowWidth ? windowWidth - length : vm.data.marquee2_margin//            ，      
 });
 vm.run1();//                    
 vm.run2();//               
 },
 run1: function () {
 var vm = this;
 var interval = setInterval(function () {
 if (-vm.data.marqueeDistance < vm.data.length) {
 vm.setData({
  marqueeDistance: vm.data.marqueeDistance - vm.data.marqueePace,
 });
 } else {
 clearInterval(interval);
 vm.setData({
  marqueeDistance: vm.data.windowWidth
 });
 vm.run1();
 }
 }, vm.data.interval);
 },
 run2: function () {
 var vm = this;
 var interval = setInterval(function () {
 if (-vm.data.marqueeDistance2 < vm.data.length) {
 //          marquee2_margin=30px   ，     
 vm.setData({
  marqueeDistance2: vm.data.marqueeDistance2 - vm.data.marqueePace,
  marquee2copy_status: vm.data.length + vm.data.marqueeDistance2 <= vm.data.windowWidth + vm.data.marquee2_margin,
 });
 } else {
 if (-vm.data.marqueeDistance2 >= vm.data.marquee2_margin) { //              
  vm.setData({
  marqueeDistance2: vm.data.marquee2_margin //       
  });
  clearInterval(interval);
  vm.run2();
 } else {
  clearInterval(interval);
  vm.setData({
  marqueeDistance2: -vm.data.windowWidth
  });
  vm.run2();
 }
 }
 }, vm.data.interval);
 }
})