在负责的项目中，有一个环形渐变读取进度的效果的需求，于是在网上查阅相关资料整理一下。
代码如下：
<!DOCTYPE html>
<html>
<head>
<meta charset=UTF-8>
<title>Title</title>
<script src=https://code.jquery.com/jquery-3.1.1.min.js></script>
</head>
<body>
<div>
<svg width=340 height=340 xmlns=http://www.w3.org/2000/svg>
<circle r=150 cy=170 cx=170 stroke-width=10 stroke=#FAFAFA fill=none />
<circle r=150 cy=170 cx=170 stroke-width=35 stroke=url(#linearGradient) stroke-linejoin=round stroke-linecap=round fill=none/>
<circle fill=#FFFFFF fill-rule=nonzero cx=320 cy=170 r=12></circle>
<defs>
<linearGradient x1=0% y1=80.9878035% x2=96.9769965% y2=41.7547666% id=linearGradient>
<stop stop-color=#18A6FF offset=0%></stop>
<stop stop-color=#32B7FF offset=52.7095376%></stop>
<stop stop-color=#0094F1 offset=100%></stop>
</linearGradient>
</defs>
</svg>
<div>
<div>
<span></span><span>%</span>
</div>
</div>
</div>
<script type=text/javascript>
window.onload=function () {
'use strict';
var ProgressCircle = (function () {
function ProgressCircle(percent,radius,elementClass){
this._percent = percent; //百分比
this._radius = radius; //圆的半径
this._elementClass = elementClass;
}
ProgressCircle.prototype.calcDashOffset = function () {
var circumference;
circumference = Math.PI * (2 * this._radius); //计算圆圈的周长
return Math.round(circumference - this._percent / 100 * circumference); //计算圆圈要渲染的 长度！
}
//渲染进度条
ProgressCircle.prototype.createCSS = function() {
return $(. + this._elementClass + .circle_bar).css('stroke-dashoffset', this.calcDashOffset());
};
//读取效果
ProgressCircle.prototype.updateText = function () {
$(. + this._elementClass + .js-donut-figure)[0].innerText = this._percent;
}
ProgressCircle.prototype.init = function() {
var _this = this;
setTimeout(function(){
_this.updateText();
return _this.createCSS();
},1000);
};
return ProgressCircle;
})();
let progress = new ProgressCircle(50, 150, 'donut');
progress.init();
}
</script>
<style type=text/css>
*{
padding:0;
margin:0
}
.donut{
position: relative;
}
.circle_warp{
position: relative;
top: 0;
left: 0
}
.circle_bar {
stroke-dasharray: 942.4777960769379; //计算整个圆周的周长公式为Circumstance=2*PI*Radius 2*3.14*半径（此时是半径是150）
stroke-dashoffset: 942.4777960769379;
transition: stroke-dashoffset 1200ms cubic-bezier(.99,.01,.62,.94);
}
.donut_svg{
transform: rotate(-90deg);
}
.donut_copy{
text-align: center;
width: 340px;
height: 340px;
top: 40%;
left: 0;
position: absolute;
}
.donut_title{
opacity: 0;
font-size: 42px;
color: #171717;
margin-bottom: 2px;
animation: donutTitleFadeLeft 800ms 200ms cubic-bezier(.99,.01,.22,.94) forwards;
transform: translateX(0);
font-weight: bold;
}
.donut_spic{
content: %;
animation: donutTitleFadeRight 800ms 200ms cubic-bezier(.99,.01,.22,.94) forwards;
opacity: 0;
transform: translateY(-20px);
}
.donut__text p{
font-size: 16px;
color: #AAAAAA;
}
@keyframes donutTitleFadeLeft {
from {
opacity: 0;
transform: translateX(0);
}
to {
opacity: 1;
transform: translateX(10px);
}
}
@keyframes donutTitleFadeRight {
from {
opacity: 0;
transform: translateX(-30px);
}
to {
opacity: 1;
transform: translateX(0);
}
}
</style>
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