效果如下：

代码如下：

 !DOCTYPE html 
 html lang="en" 
 head 
 meta charset="UTF-8" 
 meta name="viewport" content="maximum-scale=1.0,minimum-scale=1.0,user-scalable=0,width=device-width,initial-scale=1.0"/ 
 meta name="format-detection" content="telephone=no,email=no,date=no,address=no" 
 title canvas绘制环形进度条 /title 
 style type="text/css" 
 .chartbox{width: 100px;margin: 100px auto;}
 .myChart{width:100px;height: 100px;}
 /style 
 /head 
 body 
 div 
 canvas id="myChart" width="100%" height="100%" data-total="100" data-curr="29.45" /canvas 
 /div 
 script typet="text/javascript" src="jquery/1.9.1/jquery.min.js" /script 
 script type="text/javascript" 
 (function($, window, undefined) { 
 $.fn.ringChart = function(options) {
 var defaults = { };
 var settings = $.extend({}, defaults, options);
 var canvas = $(this).get(0);
 var total = $(this).attr("data-total");
 var curr = $(this).attr("data-curr");
 var constrast = parseFloat(curr/total).toFixed(2); //比例
 var context = null;
 if ( !canvas.getContext) {
 return;
 // 定义开始点的大小
 var startArc = Math.PI*1.5;
 // 根据占的比例画圆弧
 var endArc = (Math.PI * 2) * constrast;
 context = canvas.getContext("2d");
 // 圆心文字
 context.font="28px Arial";
 context.fillStyle = '#ff801a';
 context.textBaseline = 'middle';
 var text=(Number(curr/total)*100).toFixed(0)+"%";
 var tw=context.measureText(text).width;
 context.fillText(text,50-tw/2,50);
 // 绘制背景圆 
 context.save();
 context.beginPath();
 context.strokeStyle = "#e7e7e7";
 context.lineWidth = "4";
 context.arc(50, 50, 44, 0, Math.PI * 2, false);
 context.closePath();
 context.stroke();
 context.restore();
 // 若为百分零则不必再绘制比例圆
 if ( curr / total == 0) {
 return;
 // 绘制比例圆 
 context.save();
 context.beginPath();
 context.strokeStyle = "#ff801a";
 context.lineWidth = "4";
 context.arc(50, 50, 44, startArc, (curr % total == 0 startArc : (endArc+startArc)), false);
 context.stroke();
 context.restore();
 })($, window);
 $("#myChart").ringChart();
 /script 
 /body 
 /html 

以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持凡科！