<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta content="yes" name="apple-mobile-web-app-capable">
<meta name="viewport" content="width=device-width,height=device-height,maximum-scale=1.0,user-scalable=no">
<meta name="screen-orientation" content="portrait">
<meta name="x5-orientation" content="portrait">
<meta name="full-screen" content="yes">
<meta name="x5-fullscreen" content="true">
<meta name="browsermode" content="application">
<meta name="x5-page-mode" content="app">
<meta name="msapplication-tap-highlight" content="no">
<title>Document</title>
</head>
<style type="text/css">
circle {-webkit-transition: stroke-dasharray 1s;transition: stroke-dasharray 1s;}
.box{ position: relative;}
.grade{ position: absolute; width: 4rem; left: 50%; margin-left: -2rem; text-align: center; top: 1.8rem; font-size: 24px;}
.svg_box{ margin: 0 auto;}
.svg_main{ width:4rem; height: 4rem; position: absolute; left: 50%; top: 0; transform-origin: 50% 50%; -webkit-transform: rotate(-90deg); transform: rotate(-90deg); margin-left: -2rem;}
body{ margin: 0; padding: 0;}
</style>
<script>
function setRootSize(){
var docWid = window.document.documentElement,
width = docWid.getBoundingClientRect().width,
fontSize = (width >= 450) ? (450 / 7.5) : width / 750 * 100;
docWid.style.fontSize = fontSize + 'px';
}
window.addEventListener('resize', function() {
setRootSize();
}, false);
setRootSize();
</script>
<body>
<div class="box">
<div class="grade">
<span id="grade"></span><span>%</span>
</div>
<div class="svg_box">
<svg class="svg_main">
<circle cx="2rem" cy="2rem" r="1.2rem" stroke-width="0.1rem" stroke="#D1D3D7" fill="none"></circle>
<circle cx="2rem" cy="2rem" r="1.2rem" stroke-width="0.1rem" stroke="red" stroke-linecap="round" fill="none" stroke-dasharray="0 1069"></circle>
</svg>
</div>
</div>
</body>
<script type="text/javascript">
var circle = document.querySelectorAll("circle")[1];
var grade = document.getElementById('grade');
var percent = 0.8, perimeter = Math.PI * 2 * 1.2;
var num = 1;
setInterval(function(){
percent
if(num<parseInt(percent*100)){
num++;
console.log(num);
grade.innerHTML = num;
}
}, 20)
setTimeout(()=>{
circle.setAttribute('stroke-dasharray', (perimeter * percent)+'rem' + " " + (perimeter * (1- percent))+ 'rem');
}, 500)
</script>
</html>
SVG实现圆形进度条加载效果
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