微信小程序 使用canvas画圆形倒计时动画

参考文档：https://www.cnblogs.com/quietxin/p/9418813.html
效果：

wxml页面

<view class="container">
     <view class='progress_box'>
        <canvas class="progress_bg"   canvas-id="canvasProgressbg">  </canvas> 
        <canvas class="progress_canvas" canvas-id="secondCanvas"></canvas>
    </view>
</view>

wxss页面

.progress_box{
  position: relative;
  width:84px;
  height: 84px;  
  display: flex;  
  align-items: center;
  justify-content: center;
  background-color: white;
  border-radius: 84px;
}
.progress_bg{
  position: absolute;
  width:84px;
  height: 84px; 
}
.progress_canvas{
  width:84px;
  height: 84px; 
}

js页面

   // page/process/process.js
Page({

  /**
   * 页面的初