微信小程序实现时间进度条功能

关于答题类，或者一些游戏环节的小程序需要用到时间进度条，该功能怎么实现？看下面源码

<view class='out' style='margin-top:10px'>
 <view class='in' style='width:{{progressWidth}}%'></view>
</view>
<view class='caozuo'>
 <text>{{progressTime}}秒</text>
 <text bindtap='playbtn' data-change='1'>{{playPausetips}}</text>
</view>

CSS:

.out {margin-left:auto;margin-right:auto;width:250px;height:20px;border:1px solid red;border-radius:20px;overflow:hidden;}
.in {height:100%;background-color:red;}
.caozuo{font-size:14px;color:#333;margin-left:auto;margin-right:auto;width:250px;margin-top:10px;display: flex;justify-content:space-between}

JS:

Page({
 data: {
 progressWidth:0,
 progressTime:60,
 mark:true,
 playPausetips:"开始"
 },
 playbtn() {
 let that = this;
 let mark = that.data.mark;
 if (mark){
  that.timer = setInterval(that.run, 1000); //that.timer关键点
  wx.showToast({
  title: '开始',
  })
  that.setData({
  mark:false,
  playPausetips:"暂停"
  })
 }else{
  clearInterval(that.timer);
  wx.showToast({
  title: '暂停',
  })
  that.setData({
  mark: true,
  playPausetips: "开始"
  })
 }
 },
 run(){
 let that = this;
 let totalProgressTime = 60 //秒
 let progressWidth = that.data.progressWidth; //显示进度
 let progressTime = that.data.progressTime; //时间
 
 if (progressWidth === 100) {
  wx.showToast({
  title: '结束回调处理',
  })
  clearInterval(that.timer);
  that.setData({
  progressTime: totalProgressTime, //进度条需要总时间s
  progressWidth: 100, //进度100%
  progressTime: 60
  })
  return;
 }
 progressTime--;
 progressWidth = (totalProgressTime - progressTime) * (100 / 60)
 that.setData({
  progressWidth: progressWidth,
  progressTime: progressTime
 })
 }
 
})

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