微信小程序画布圆形进度条显示效果

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

// 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"_blank" href="//www.jb51.net/Special/900.htm">《微信小程序开发教程》小编为大家精心整理的，希望喜欢。

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