和上传图片是一个函数，在细节上略有不同。

<b-form-file placeholder="上传mp4视频" browse-text="文件" v-model="file" class="mb-2" accept=".mp4" ></b-form-file>

//上传视频
let file = this.file
const reader = new FileReader()
reader.readAsArrayBuffer(file)
reader.onload = (event) => {
  that.ipfs.add({
    path: file.name,
    content: Buffer.from(event.target.result)},
  (error, added) => {
    if (error) {
        console.log(123, error)
    } else {
        //上传成功
        that.addNew = true
        let body = added[0].hash
        console.log(234, body)
    }
  })
}