用javascript下载深度数据的最好方法？

function downloadData(url, filename) {
  var xhr = new XMLHttpRequest();
  xhr.open('GET', url, true);
  xhr.responseType = 'blob';

  xhr.onload = function() {
    if (xhr.status === 200) {
      var blob = xhr.response;
      var link = document.createElement('a');
      link.href = window.URL.createObjectURL(blob);
      link.download = filename;
      link.click();
    }
  };

  xhr.send();
}

// 调用示例
downloadData('http://example.com/deepdata', 'deepdata.csv');

function downloadData(url, filename) {
  fetch(url)
    .then(response => response.blob())
    .then(blob => {
      var link = document.createElement('a');
      link.href = window.URL.createObjectURL(blob);
      link.download = filename;
      link.click();
    });
}

// 调用示例
downloadData('http://example.com/deepdata', 'deepdata.csv');