css3 如何实现进度条效果-木庄网络博客

本文摘自PHP中文网，作者Guanhui，侵删。

项目过程中，开始使用了js的requestAnimationFrame方法实现进度条，但是在数据超级多的时候非常影响性能，如此改用css去实现，优化。

先贴代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style type="text/css">
        *{margin: 0;padding: 0}
  
        .box{width: 100px;height: 10px;border-radius: 10px;background: #999;margin: 100px auto;border: 1px solid #ff6780;}
        .child{position: relative;height:100%;border-radius:inherit;}
  
        .process-animate{background: #ff6780;position: absolute;left: 0;top: 0;bottom: 0;border-radius:inherit;
            animation: process 1s linear forwards ;
        }
        @keyframes process
        {
            0%{
                left:0;right:100%;
            }
            20%{
                right:80%
            }
            40%{
                right:60%;
            }
            60%{right:40%;}
            80%{right:20%;}
            100%{right:0;}
        }
     
    </style>
</head>
<body>
    <p class="box">
        <p class="child" style="width:50%"> // child的百分比就是进度条的占比效果
            <p class="process-animate"></p>
        </p>
    </p>
</body>
</html>

效果图（复制代码可查看动态效果）：

正常情况下，百分比肯定是根据后台数据进行计算得出的，所以是动态传入的，下面贴vue代码

进度条子组件（progress.vue）：

<template>
  <p class="process-wrapper" :class="{'addGray':addGray}">
    <p class="process-child" ref="processChild">
      <p class="process-animate" :class="{'addGray':addGray}"></p>
    </p>
  </p>
</template>
  
<script>
export default {
  props: {
    addGray: {
      //置灰
      type: Boolean,
      default: false
    },
    progressWidth: {
      //进度条百分比
      type: Number,
      default: 0
    }
  },
  mounted() {
    this.$nextTick(() => {
      console.log(this.addGray, "addGray---");
      this.$refs.processChild.style.width = this.progressWidth + "%";  //动态改变进度条
      // this.$refs.processChild.style.width = 90 + "%"; 测试效果
    });
  }
};
</script>
  
<style lang="scss" scoped>
.process-wrapper {
  width: 1.98rem;
  height: 0.13rem;
  margin: 0.12rem 0 0.1rem 0;
  border-radius: 0.1rem;
  background: #fff;
  border: 0.01rem solid #ff6780;
  &.addGray {
    background: #999;
    border: 0.01rem solid #999;
  }
  .process-child {
    position: relative;
    height: 100%;
    // width: 100%;  //这个width就是动态变化。通过js改变
    border-radius: inherit;
    .process-animate {
      background: #ff6780;
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      border-radius: inherit;
      animation: process 1s linear forwards;
      &.addGray {
        background: #999 !important;
        // border: 0.01rem solid #999;
      }
    }
  }
}
  
@keyframes process {
  0% {
    left: 0;
    right: 100%;
  }
  20% {
    right: 80%;
  }
  40% {
    right: 60%;
  }
  60% {
    right: 40%;
  }
  80% {
    right: 20%;
  }
  100% {
    right: 0;
  }
}
</style>