a标签下载功能（同域和跨域）_a标签跨域下载

作者：盐析白兔 | 2024-02-06 17:00:03

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a标签跨域下载

在这里插入图片描述

<!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>Document</title>
  </head>
  <body>
    <div>
      <!-- a 标签下载 -->
      <a href="/04-a标签下载功能/test.png" download="demo">下载</a>

      <!-- 其他标签实现下载   同域    -->
      <div onclick="download()">下载</div>

      <!-- 其他标签实现下载   跨域    -->
      <div onclick="download1()">下载</div>
    </div>
    <script>
      // 同域
      function download(
        url = '/04-a标签下载功能/test.png',
        title = 'demo2',
        artist = 'down'
      ) {
        const eleLink = document.createElement('a') // 新建A标签
        eleLink.href = url || '/04-a标签下载功能/test.png' // 下载的路径
        eleLink.download = `${title} - ${artist}` // 设置下载的属性，可以为空
        eleLink.style.display = 'none'
        document.body.appendChild(eleLink)
        eleLink.click() // 触发点击事件
        document.body.removeChild(eleLink)
      }
      // 跨域
      function download1(
        url = 'https://upload-images.jianshu.io/upload_images/5809200-a99419bb94924e6d.jpg?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240',
        title = 'demo3',
        artist = 'down'
      ) {
        var x = new XMLHttpRequest()
        x.open('GET', url, true)
        x.responseType = 'blob'
        x.onload = function () {
          const url = window.URL.createObjectURL(x.response)
          const eleLink = document.createElement('a')
          eleLink.href = url
          eleLink.download = `${title} - ${artist}`
          eleLink.style.display = 'none'
          document.body.appendChild(eleLink)
          eleLink.click()
          document.body.removeChild(eleLink)
        }
        x.send()
      }
    </script>
  </body>
</html>

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