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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