本文实例为大家分享了JavaScript实现圆形进度条效果的具体代码，供大家参考，具体内容如下
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<style>
.itemwait{
position:absolute;
top : 0;
bottom:0;
left:0;
right:0;
margin: 0 auto;
}
.progress{
stroke-dasharray: 251;
stroke-dashoffset: 0;
/*
stroke-dasharray： 虚线
stroke-dashoffset: 偏移间隔
*/
}
</style>
</head>
<body>
<svg width="200" height="200" version="1.1" class='itemwait'>
<circle class='progress' cx="100" cy="50" r="40" stroke="pink" stroke-width="5" fill="transparent" />
<text class='text' x="100" y="50" fill='pink' text-anchor='middle' alignment-baseline='middle'>开始加载</text>
</svg>
</body>
<script async type='text/javascript'>
//js代码见下文
</script>
</html>
1.原生js实现
const loadingArr=[1,2,10,20,40,70,90,100]
let index=0
var timer=setInterval(()=>{
let total=document.querySelector('.progress').getTotalLength();
let progress=document.querySelector('.progress')
console.log(typeof total)
progress.style.strokeDashoffset=(total)*(1-loadingArr[index]/100)
if(index<=loadingArr.length){
document.querySelector('.text').textContent=`${loadingArr[index]}%`
}
index++
if(index===loadingArr.length){
clearInterval(timer)
document.querySelector('.text').textContent='加载完成'
}
},500)
2.jQuery实现
let index = 0
var $circle = $('.progress');
var r = $circle.attr('r');
var timer = setInterval(() => {
var total = Math.PI * (r * 2);
var pct = (1-index / 100) * total;
console.log(typeof pct,pct)
if (index <= 100) {
$('.text').text(`${index}%`);
$circle.css({ strokeDashoffset: pct });
}
index = index + 10
if (index > 100) {
$('.text').text('加载完成');
clearInterval(timer)
}
}, 500)
3.最初按照自己的想法实现
const loadingArr=[1,2,10,20,40,70,90,100]
let index=0
var timer=setInterval(()=>{
let total=document.querySelector('.progress').getTotalLength();
let progress=document.querySelector('.progress')
console.log(typeof total)
progress.style.strokeDashoffset=(total)*(1-loadingArr[index]/100)
$('.text').text(function(){
if(index<=loadingArr.length){
return `${loadingArr[index]}%`
}
})
index++
if(index===loadingArr.length){
clearInterval(timer)
$('.text').text('加载完成')
}
},500)
总结
知识点：svg绘图、js原生操作、jQuery
- stroke-dasharray： 虚线
- stroke-dashoffset: 偏移间隔
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持NICE源码。
