<template>
 <div class="content" ref="box">
 <svg style="transform: rotate(-90deg)" :width="width" :height="width" xmlns="http://www.w3.org/2000/svg">
  <circle :r="(width-radius)/2"
  :cy="width/2"
  :cx="width/2"
  :stroke-width="radius"
  :stroke="backgroundColor"
  fill="none"
  />
  <circle ref="$bar"
  :r="(width-radius)/2"
  :cy="width/2"
  :cx="width/2"
  :stroke="barColor"
  :stroke-width="radius"
  :stroke-linecap="isRound "
  :stroke-dasharray="(width-radius)*3.14"
  :stroke-dashoffset="isAnimation "
  fill="none"
  />
 </svg>
 <div class="center_text" :style="{color, fontSize}">
  <p v-if="!$slots.default" class="title">{{progress}}%</p>
  <slot></slot>
 </div>
 </div>
</template>

<script>
export default {
 props: {
 radius: {
  type: [Number, String],
  default: 20
 }, // 进度条厚度
 progress: {
  type: [Number, String],
  default: 20
 }, // 进度条百分比
 barColor: {
  type: String,
  default: "#1890ff"
 }, // 进度条颜色
 backgroundColor: {
  type: String,
  default: "rgba(0,0,0,0.3)"
 }, // 背景颜色
 isAnimation: {
  // 是否是动画效果
  type: Boolean,
  default: true
 },
 isRound: {
  // 是否是圆形画笔
  type: Boolean,
  default: true
 },
 id: {
  // 组件的id，多组件共存时使用
  type: [String, Number],
  default: 1
 },
 duration: {
  // 整个动画时长
  type: [String, Number],
  default: 1000
 },
 delay: {
  // 延迟多久执行
  type: [String, Number],
  default: 200
 },
 timeFunction: {
  // 动画缓动函数
  type: String,
  default: "cubic-bezier(0.99, 0.01, 0.22, 0.94)"
 },
 circleWidth: {
  //圆环宽度
  type: Number,
  default: 100,
 },
 color: {
  //文字颜色
  type: String,
  default: '#000'
 },
 fontSize: {
  //文字大小
  type: String,
  default: '18px'
 }
 },
 data() {
 return {
  width: this.circleWidth,
  idStr: `circle_progress_keyframes_${this.id}`
 };
 },
 beforeDestroy() {
 // 清除旧组件的样式标签
 document.getElementById(this.idStr) &&
 document.getElementById(this.idStr).remove();
 window.addEventListener(() => {});
 },
 mounted() {
 let self = this;
 this.setCircleWidth();
 this.setAnimation();
 // 此处不能使用window.onresize
 window.addEventListener(
  "resize",
  debounce(function() {
  self.setCircleWidth();
  self.setAnimation(self);
  }, 300)
 );
 },
 methods: {
 setCircleWidth() {
  let box = this.$refs.box;
  let width = box.clientWidth;
  let height = box.clientHeight;
  let cW = width > height "vue-circle-progress should not have same id style");
   document.getElementById(self.idStr).remove();
  }
  // 生成动画样式文件
  let style = document.createElement("style");
  style.id = self.idStr;
  style.type = "text/css";
  style.innerHTML = `
  @keyframes circle_progress_keyframes_name_${self.id} {
  from {stroke-dashoffset: ${(self.width - self.radius) * 3.14}px;}
  to {stroke-dashoffset: ${((self.width - self.radius) *
  3.14 *
  (100 - self.progress)) /
  100}px;}}
  .circle_progress_bar${
  self.id
  } {animation: circle_progress_keyframes_name_${self.id} ${
   self.duration
  }ms ${self.delay}ms ${self.timeFunction} forwards;}`;
  // 添加新样式文件
  document.getElementsByTagName("head")[0].appendChild(style);
  // 往svg元素中添加动画class
  self.$refs.$bar.classList.add(`circle_progress_bar${self.id}`);
  }
 }
 }
};
</script>
<style scoped>
.content {height:100%;display:flex;justify-content:center;align-items: center;}
.center_text {position:absolute;}
</style>

<CircleProgress :id="'circle1'" :circleWidth="40" :radius="7" :progress="30" :isAnimation="true" :backgroundColor="'#E9E9E9'" :barColor="'#FF4F4F'" />
<CircleProgress :id="'circle2'" :circleWidth="40" :radius="7" :progress="50" :isAnimation="true" :backgroundColor="'#E9E9E9'" :barColor="'#FF902A'" />
<CircleProgress :id="'circle3'" :circleWidth="40" :radius="7" :progress="89" :isAnimation="true" :backgroundColor="'#E9E9E9'" :barColor="'#FFDB4F'" />
<CircleProgress :id="'circle4'" :circleWidth="40" :radius="7" :progress="25" :isAnimation="true" :backgroundColor="'#E9E9E9'" :barColor="'#B8D87E'" />

function debounce(func, wait, immediate) {
 let timeout, args, context, timestamp, result

 const later = function () {
 // 据上一次触发时间间隔
 const last = +new Date() - timestamp

 // 上次被包装函数被调用时间间隔last小于设定时间间隔wait
 if (last < wait && last > 0) {
  timeout = setTimeout(later, wait - last)
 } else {
  timeout = null
  // 如果设定为immediate===true，因为开始边界已经调用过了此处无需调用
  if (!immediate) {
  result = func.apply(context, args)
  if (!timeout) context = args = null
  }
 }
 }