环形加载进度条封装（Vue插件版和原生js版）

本文实例为大家分享了环形加载进度条封装代码，供大家参考，具体内容如下

1、效果预览

2、用到的知识

主要利用SVG的stroke-dasharray和stroke-dashoffset这两个属性。
在看下面文章之前，你需要了解

<!DOCTYPE html>
<html>
<head>
 <title>svg demo</title>
 <style type="text/css">
 #line{
 transition: all 2s;
 stroke-dasharray:300,320;
 stroke-dashoffset:300;
 }
 svg:hover #line{
 stroke-dashoffset: 0;
 }

 #circle{
 transition: all 2s;
 stroke-dasharray:314,314;
 stroke-dashoffset:314;
 }
 svg:hover #circle{
 stroke-dashoffset:0;
 }
 </style>
</head>
<body>

<h3>线段区域</h3>
<svg width="100%" height="40" >
 <line id="line" x1="30" y1="30" x2="300" y2="30" stroke-width="20" stroke="red" />
</svg>
<h3>圆区域</h3>

<svg width="200" height="200" viewBox="0 0 200 200">
 <circle id="circle" cx="100" cy="80" r="50" fill="gray" stroke-width="5" stroke="green" />
</svg>

</body>
</html>

3、使用

有两种方式，一种是直接安装即可使用，一种需要封装。选一种适合自己的即可。

（1）、安装插件

安装Vue插件

npm install loading-vue-component

使用

// main.js
import loading from 'loading-vue-component'
Vue.use(loading)

// app.vue
<template>
 <div id="app">
  <loading :radius="20" :progress="progress" :stroke="2" :color='color'></loading>
 </div>
</template>

<script>
export default {
 name: 'app',
 data() {
 return { progress: 0,color:'#1989fa'}
 }
}
</script> 

（2）、封装插件

Vue版

<!DOCTYPE html>
<html lang="en">

<head>
 <meta charset="UTF-8">
 <title>loading</title>
 <style>
 html,
 body {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  position: relative;
  margin: 0;
  padding: 0;
 }
 circle {
  transition: stroke-dashoffset 0.15s;
  transform: rotate(-90deg);
  transform-origin: 50% 50%;
 }
 .txt{
 font-size: 14px;
 text-align: center;
 }
 .loading{
  padding:40vh;
 }
 </style>
</head>

<body>
 <div id="example"></div>
</body>
<script src="https://unpkg.com/vue@2.6.10/dist/vue.js"></script>
<script>
// 子组件
const Loading = Vue.component('Loading', {
 props: {
  radius: Number,
  progress: Number,
  stroke: Number,
  color:String
 },
 data() {
  const progressed = this.progress;
  const colored = this.color
  const normalizedRadius = this.radius - this.stroke * 2; // 净半径，总半径-2*路径宽
  const circumference = normalizedRadius * 2 * Math.PI; // 周长，2πd
  return {
   normalizedRadius,
   circumference,
   progressed,
   colored
  };
 },
 mounted() {
  // emulating progress
  const interval = setInterval(() => {
   this.progressed += 25;
   if (this.progressed > 101) {
    this.colored='white'
   }
   this.colored='#1989fa'
  }, 150);
 },
 computed: {
  strokeDashoffset() {
   return this.circumference - this.progressed / 100 * this.circumference;
  }
 },
 template: `
 <div class='loading'>
 <svg
  :height="radius * 2"
  :width="radius * 2"
  >
  <circle
   :stroke="color"
   :stroke-dasharray="circumference + ' ' + circumference"
   :style="{ strokeDashoffset: strokeDashoffset }"
   :stroke-width="stroke"
   fill="transparent"
   :r="normalizedRadius"
   :cx="radius"
   :cy="radius"
  />
 </svg>
  <p class='txt'>加载中</p>
 </div>
 `
});
// 父组件
new Vue({
 el: '#example',
 components: {
  'Loading': Loading
 },
 data() {
  return { progress: 0,color:'#1989fa',show:true}
 },
 mounted () {
  setTimeout(() => {
  this.show = false
  },3000)
 },
 template: `
 <div>
  <Loading :radius="20" :progress="progress" :stroke="2" :color='color' v-show='show'></Loading>
 </div>
 `
});
</script>

</html>

原生js版

<!DOCTYPE html>
<html lang="en">

<head>
 <meta charset="UTF-8">
 <title>progress</title>
 <style>
  html, body {
 background-color: #333;
 display: flex;
 align-items: center;
 justify-content: center;
 height: 100%;
 position: relative;
}
.progress-ring__circle {
 transition: 0.35s stroke-dashoffset;
 transform: rotate(-90deg);
 transform-origin: 50% 50%;
}

input {
 position: fixed;
 top: 10px;
 left: 10px;
 width: 80px;
}
 </style>
</head>

<body>
 <svg class="progress-ring" width="120" height="120">
  <circle class="progress-ring__circle" stroke="white" stroke-width="4" fill="transparent" r="52" cx="60" cy="60" />
 </svg>
 <input value="35" type="number" step="5" min="0" max="100" placeholder="progress">
</body>
<script type="text/javascript">
var circle = document.querySelector('circle');
var radius = circle.r.baseVal.value;
var circumference = radius * 2 * Math.PI;

circle.style.strokeDasharray = `${circumference} ${circumference}`;
circle.style.strokeDashoffset = `${circumference}`;

function setProgress(percent) {
 const offset = circumference - percent / 100 * circumference;
 circle.style.strokeDashoffset = offset;
}

const input = document.querySelector('input');
setProgress(input.value);

input.addEventListener('change', function(e) {
 if (input.value < 101 && input.value > -1) {
  setProgress(input.value);
 }
})
</script>

</html>

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