代码：
js：
//获取应用实例 var app = getApp() var interval; var varName; var ctx = wx.createCanvasContext('canvasArcCir'); Page({ data: { }, drawCircle: function () { clearInterval(varName); function drawArc(s, e) { ctx.setFillStyle('white'); ctx.clearRect(0, 0, 200, 200); ctx.draw(); var x = 100, y = 100, radius = 96; ctx.setLineWidth(7); ctx.setStrokeStyle('#BFEFFF'); ctx.setLineCap('round'); ctx.beginPath(); ctx.arc(x, y, radius, s, e, false); ctx.stroke() ctx.draw() } var step = 1, startAngle = 1.5 * Math.PI, endAngle = 0; var animation_interval = 1000, n = 60; var animation = function () { if (step <= n) { endAngle = step * 8 * Math.PI / n + 1.5 * Math.PI; drawArc(startAngle, endAngle); step++; } else { clearInterval(varName); } }; varName = setInterval(animation, animation_interval); }, onReady: function () { //创建并返回绘图上下文context对象。 var cxt_arc = wx.createCanvasContext('canvasCircle'); cxt_arc.setLineWidth(8); cxt_arc.setStrokeStyle('#EDEDED'); cxt_arc.setLineCap('round'); cxt_arc.beginPath(); cxt_arc.arc(100, 100, 96, 0, 2 * Math.PI, false); cxt_arc.stroke(); cxt_arc.draw(); }, onLoad: function (options) { } })
wxml：
<view> <view> <canvas canvas-id="canvasArcCir"> </canvas> <canvas canvas-id="canvasCircle"> </canvas> <view bindtap="drawCircle">点击开始</view> </view> </view>
wxss：
page { width: 100%; height: 100%; background-color: #fff; } .circle-box { text-align: center; margin-top: 10vw; } .circle { position: absolute; left: 0; right: 0; margin: auto; } .draw_btn { width: 28vw; position: absolute; top: 31vw; right: 0; left: 0; margin: auto; border: 1px #0D0D0D solid; background-color: #BFEFFF; border-radius: 5vw; }