前端使用XMLHttpRequest实现通过链接下载文件<meta name="viewport" content="w

前端使用XMLHttpRequest实现通过链接下载图片

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <input type="button" value="test" onclick="test()">
  
  <script>
    const fileInfo = {
      url: 'https://res.hc-cdn.com/cnpm-common-resource/2.0.2/base/header/components/images/logo.png',
      name: 'a.png'
    }
    function test() {
      downloadUrlFile(fileInfo.url)
    }
    function downloadUrlFile(url) {
      const xhr = new XMLHttpRequest()
      xhr.open('GET', url, true)
      xhr.responseType = 'blob'
      xhr.onload = () => {
        if (xhr.status === 200) {
          saveAs(xhr.response, fileInfo.name)
        }
      }
      xhr.send()
    }
    function saveAs(data, name) {
        var urlObject = window.URL || window.webkitURL || window;
        var export_blob = new Blob([data]);
        var save_link = document.createElementNS('http://www.w3.org/1999/xhtml', 'a')
        save_link.href = urlObject.createObjectURL(export_blob);
        save_link.download = name;
        save_link.click();
    }
  </script>
</body>
</html>