将oss 链接形式的视频 下载到本地

function downVideo (url, name){
  var xhr = new XMLHttpRequest();
  xhr.open('GET', url, true);
  xhr.responseType = 'arraybuffer';    // 返回类型blob
  xhr.onload = function () {
    if (xhr.readyState === 4 && xhr.status === 200) {
        let blob = this.response;
        // 转换一个blob链接
        let u = window.URL.createObjectURL(new Blob([blob],{ type: 'video/mp4' }))
        let a = document.createElement('a');
        a.download = name;
        a.href = u;
        a.style.display = 'none'
        document.body.appendChild(a)
        a.click();
        a.remove();
    }
  };
  xhr.send()
}