代码：
wxml
<!--pages/test/test.wxml--> <canvas 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) } } })