Paste_Image.png
<!DOCTYPE html><html><meta charset="utf-8"><head>
<title></title>
<style type="text/css">
*{ margin: 0; padding: 0;
} </style>
<!-- <script type="text/javascript" class="lazyload" src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB/AAffA0nNPuCLAAAAAElFTkSuQmCC" data-original="js/Progress.js"></script> --></head><body>
<canvas id="canvas1"></canvas>
<canvas id="canvas2"></canvas>
<canvas id="canvas3"></canvas>
<canvas id="canvas8"></canvas>
<canvas id="canvas9"></canvas>
<canvas id="canvas10"></canvas>
<script type="text/javascript">
window. = function(){ new Progress().renderOne('canvas1',100,6,10);//id，画布宽和高，圆的半径 百分百。
new Progress().renderOne('canvas2',100,5,20); new Progress().renderOne('canvas3',100,5,30);
new Progress().renderOne('canvas8',100,5,80); new Progress().renderOne('canvas9',100,5,90); new Progress().renderOne('canvas10',100,5,100);
} function Progress() { var progress = { textheight: null, renderOne: function(id, length, r, percent) { var canvas = document.getElementById(id); var context = canvas.getContext("2d");
canvas.width = length;
canvas.height = length; var i = 0; var interval = setInterval(function() { i++;
progress.render(context, length, r, i, percent); if (i >= percent) { clearInterval(interval) } }, 10) }, render: function(context, length, r, i, percent) { context.clearRect(0, 0, length, length);
context.beginPath(); var gradient = context.createLinearGradient(length, 0, 0, 0);
gradient.addColorStop("0", "#76EEC6");
gradient.addColorStop("1.0", "#63B8FF");
context.strokeStyle = gradient;
context.lineWidth = r;
context.arc(length / 2, length / 2, length / 2 - r, -0.5 * Math.PI, -0.5 * Math.PI + i * 0.02 * Math.PI, false);
context.stroke();
context.closePath();
context.beginPath();
context.strokeStyle = "#8d8d8d";
context.strokeStyle ='red';/////////////////////////////////////////////////
context.lineWidth = 2;
context.fillStyle = "#ffffff";
context.arc(length / 2, r, 0.6 * r, 0, 2 * Math.PI, false);
context.stroke();
context.fill();
context.closePath();
context.beginPath(); var radian = percent / 100 * 2 * Math.PI - 0.5 * Math.PI; var x = Math.cos(radian) * (length / 2 - r) + length / 2; var y = Math.sin(radian) * (length / 2 - r) + length / 2;
context.arc(x, y, 0.6 * r, 0, 2 * Math.PI, false);
context.stroke();
context.fill();
context.closePath();
context.beginPath();
context.lineWidth = 1;
context.strokeStyle = "#54DDAF";
context.fillStyle = "#54DDAF";
context.fillStyle = "blue";///////////////////////////////////////
context.arc(length / 2, length / 2, length / 2 - 2 * r, 0, 2 * Math.PI);
context.fill();
context.closePath();
context.beginPath();
context.font = "bold " + (length / 2 - 2.5 * r) / 2 + "px 微软雅黑";
context.fillStyle = "#ffffff"; var text = percent + "%";
textwidth = context.measureText(text).width; if (this.textheight == null) { var div = document.createElement("div"); document.body.appendChild(div);
div.innerHTML = text;
div.style.fontSize = ((length / 2 - 2.5 * r) / 2) + "px"; this.textheight = div.offsetHeight;
div.parentNode.removeChild(div) }
textheight = this.textheight;
context.fillText(text, (length - textwidth) / 2, length / 2 + textheight / 4);
context.fill();
context.closePath() } }; return progress };
</script></body></html>
作者：山豆山豆
链接：https://www.jianshu.com/p/aaf65343a697
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