js实现圆形进度条

js实现圆形进度条，源代码：

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>js实现圆形进度条</title>
<style>
.container {
	width: 300px;
	height: 300px;
	margin: 100px auto;
	/* border: 1px solid #000; */
}
.circle-progressbar {
	position: relative;
	width: 100%;
	height: 100%;
}
.circle-progressbar .title {
	margin: 0;
	text-align: center;
	line-height: 300px;
}
.circle-progressbar div {
	box-sizing: border-box;
}
.circle-progressbar .wrapper {
	position: absolute;
	top: 0;
	width: 150px;
	height: 300px;
	/* border: 1px solid red; */
	overflow: hidden;
}
.circle-progressbar .wrapper.left-wrapper {
	left: 0;
}
.circle-progressbar .wrapper.right-wrapper {
	right: 0;
}
.circle-progressbar .wrapper .circle-bar {
	position: absolute;
	width: 300px;
	height: 300px;
	border: 30px solid transparent;
	border-radius: 50%;
	transform: rotate(-135deg);
	transition: transform .3s;
}
.circle-progressbar .left-wrapper .circle-bar {
	left: 0;
	border-left-color: turquoise;
	border-bottom-color: turquoise;
}
.circle-progressbar .right-wrapper .circle-bar {
	right: 0;
	border-right-color: turquoise;
	border-top-color: turquoise;
}
</style>
</head>
<body>
<div class="container">
	<div class="circle-progressbar">
		<h1 class="title">0%</h1>
		<div class="wrapper left-wrapper">
			<div class="circle-bar"></div>
		</div>
		<div class="wrapper right-wrapper">
			<div class="circle-bar"></div>
		</div>
	</div>
</div>
<script>
const circleProgressBar = CircleProgressBar();
let p = 0;
let t = setInterval(() => {circleProgressBar( ++ p)}, 200);

function CircleProgressBar() {
	const oLeftCircleBar = getCircleBar('left'),
		oRightCircleBar = getCircleBar('right'),
		oTitle = document.querySelector('.circle-progressbar .title');

	return function(percent) {
		if(percent >= 0 && percent <= 50) {
			setRotate(oRightCircleBar, percent)
		}else if(percent >= 50 && percent <= 100) {
			setRotate(oLeftCircleBar, percent - 50)
		}
		if(percent >= 0 && percent <= 100) {
			oTitle.innerText = percent + '%';
		}
		if(percent == 100) {
			t=window.clearInterval(t);
		}
	}

	function formatDegree(percent) {
		return `rotate(${ -135 + (360 / 100 * percent) }deg)`
	}

	function setRotate(node, percent) {
		node.style.transform = formatDegree(percent)
	}

	function getCircleBar(dir) {
		return document.querySelector(`.circle-progressbar .${ dir }-wrapper .circle-bar`);
	}
}
</script>
</body>
</html>

100

101

102

103

104

105

106

107

108

109

110

111

112

113

<!DOCTYPE html>

<html>

<head>

<title>js实现圆形进度条</title>

<style>

.container {

width: 300px;

height: 300px;

margin: 100px auto;

/* border: 1px solid #000; */

}

.circle-progressbar {

position: relative;

width: 100%;

height: 100%;

}

.circle-progressbar .title {

margin: 0;

text-align: center;

line-height: 300px;

}

.circle-progressbar div {

box-sizing: border-box;

}

.circle-progressbar .wrapper {

position: absolute;

top: 0;

width: 150px;

height: 300px;

/* border: 1px solid red; */

overflow: hidden;

}

.circle-progressbar .wrapper.left-wrapper {

left: 0;

}

.circle-progressbar .wrapper.right-wrapper {

right: 0;

}

.circle-progressbar .wrapper .circle-bar {

position: absolute;

width: 300px;

height: 300px;

border: 30px solid transparent;

border-radius: 50%;

transform: rotate(-135deg);

transition: transform .3s;

}

.circle-progressbar .left-wrapper .circle-bar {

left: 0;

border-left-color: turquoise;

border-bottom-color: turquoise;

}

.circle-progressbar .right-wrapper .circle-bar {

right: 0;

border-right-color: turquoise;

border-top-color: turquoise;

}

</style>

</head>

<body>

</div>

</div>

const circleProgressBar = CircleProgressBar();

let p = 0;

let t = setInterval(() => {circleProgressBar( ++ p)}, 200);

function CircleProgressBar() {

const oLeftCircleBar = getCircleBar('left'),

oRightCircleBar = getCircleBar('right'),

oTitle = document.querySelector('.circle-progressbar .title');

return function(percent) {

if(percent >= 0 && percent <= 50) {

setRotate(oRightCircleBar, percent)

}else if(percent >= 50 && percent <= 100) {

setRotate(oLeftCircleBar, percent - 50)

}

if(percent >= 0 && percent <= 100) {

oTitle.innerText = percent + '%';

}

if(percent == 100) {

t=window.clearInterval(t);

}

function formatDegree(percent) {

return `rotate(${ -135 + (360 / 100 * percent) }deg)`

}

function setRotate(node, percent) {

node.style.transform = formatDegree(percent)

}

function getCircleBar(dir) {

return document.querySelector(`.circle-progressbar .${ dir }-wrapper .circle-bar`);

}

</script>

</body>

</html>

浏览样例

js实现圆形进度条

5xue