微信小程序画布圆形进度条demo

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正文：

 

wxml

<!--pages/test/test.wxml-->
<canvas style="width: 300px; height: 200px;" canvas-id="canvasid"></canvas>

 

js

 

// pages/test/test.js
var context = new wx.createCanvasContext('canvasid', this);
var strat_num = 1, end_num = 20;
var sAngle = 1.5 * Math.PI, eAngle = 0;
Page({
  onReady: function () {
    this.canvas()
  },
  canvas:function(){
    var that=this;
    if (strat_num <= end_num){
      console.log('strat_num:', strat_num)
      eAngle = strat_num * 2 * Math.PI / end_num + 1.5 * Math.PI;
      setTimeout(function () {
        context.setStrokeStyle("#00ff00")
        context.setLineWidth(2)
        context.fillText(strat_num * 5 <= 100?strat_num * 5:100, 95, 95)
        context.arc(100, 100, 60, sAngle, eAngle, false)
        context.stroke()
        context.draw()
        that.canvas()
        strat_num++
    },200)
    } else {
      console.log('strat_num_end:', strat_num)
    }
  }
})