el-upload 自定义上传进度条

1. 图片样例，css样式需要自己调。底部有可复制粘贴的代码。

<el-upload 
    class="avatar-uploader"
    :action="https://jsonplaceholder.typicode.com/posts/"
    :show-file-list="false"
　　 accept=".mp4"
    :on-progress="uploadVideoProcess"
  >
    <i class="el-icon-plus avatar-uploader-icon"></i>
</el-upload>
<!-- 进度条 -->
<el-progress v-if="progressFlag" :percentage="loadProgress"></el-progress>
 
 
代码2：
data() {
　　loadProgress: 0, // 动态显示进度条
   progressFlag: false, // 关闭进度条
}
 
代码3: 
methods: {
      uploadVideoProcess(event, file, fileList) {
          this.progressFlag = true; // 显示进度条
          this.loadProgress = parseInt(event.percent); // 动态获取文件上传进度
          if (this.loadProgress >= 100) {
              this.loadProgress = 100
              setTimeout( () => {this.progressFlag = false}, 1000) // 一秒后关闭进度条
          }
      },
}