elementui中upload组件（el-upload）获取上传视频时长等信息

elementui upload组件获取上传视频时长等信息

1、上传文件前绑定事件

<el-upload
            class="avatar-uploader"
            action="https://up-z2.qiniup.com"
            :show-file-list="false"
            :data="uploadData"
            :before-upload="beforeAvatarUpload"
            :on-success="handleImgSuccess"
        >
          Upload
        </el-upload>

2、获取文件信息

beforeAvatarUpload(file) {
    let url = URL.createObjectURL(file)
    let audioElement = new Audio(url)
    audioElement.addEventListener('loadedmetadata',  () =>{
        console.log('badianboke视频时长为:', audioElement.duration);
    })
}