526互联

FileReader实现文件下载

发布时间 2023-07-30 18:43:02作者: HuangBingQuan
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>文件下载</title>
</head>

<body>
  <button onclick="down()">点我下载</button>
</body>
<script>
  function imgToBase64(imgUrl, callback) {
    fetch(imgUrl).then(res => res.blob())
      .then(blob => {
        const reader = new FileReader();
        reader.onloadend = () => {
          callback(reader.result);
        }
        reader.readAsDataURL(blob)
      })
  }
  function down() {
    let fileUrl = 'https://img0.baidu.com/it/u=1604010673,2427861166&fm=253&fmt=auto&app=138&f=JPEG?w=500&h=889'
    imgToBase64(fileUrl, (blob) => {
      let link = document.createElement('a');
      link.setAttribute('href', blob);
      link.download = "测试";
      link.click();
    })
  }
</script>

</html>