详解微信小程序——自定义圆形进度条

Page({ 
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  // 页面初始化 options为页面跳转所带来的参数 
 }, 
 onReady: function () { 
 
  // 页面渲染完成 
  var cxt_arc = wx.createCanvasContext('canvasArc');//创建并返回绘图上下文context对象。 
  cxt_arc.setLineWidth(6); 
  cxt_arc.setStrokeStyle('#d2d2d2'); 
  cxt_arc.setLineCap('round') 
  cxt_arc.beginPath();//开始一个新的路径 
  cxt_arc.arc(106, 106, 100, 0, 2*Math.PI, false);//设置一个原点(106,106)，半径为100的圆的路径到当前路径 
  cxt_arc.stroke();//对当前路径进行描边 
   
  cxt_arc.setLineWidth(6); 
  cxt_arc.setStrokeStyle('#3ea6ff'); 
  cxt_arc.setLineCap('round') 
  cxt_arc.beginPath();//开始一个新的路径 
  cxt_arc.arc(106, 106, 100, -Math.PI * 1 / 2, Math.PI*6/5, false); 
  cxt_arc.stroke();//对当前路径进行描边 
 
  cxt_arc.draw(); 
   
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  // 页面显示 
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  // 页面隐藏 
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  // 页面关闭 
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<view class="wrap"> 
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  <canvas class="cir" style="width:212px; height:212px;" canvas-id="canvasArc"> 
  </canvas> 
 
  <view class="cc">中间</view> 
 
 </view> 
</view> 

.cir{ 
 display: inline-block; 
 margin-top: 20rpx; 
 
} 
 
.top{ 
 text-align: center 
} 
 
.cc{ 
  
 margin-top: -120px; 
  
}