JS a标签文件下载

    aDownload(url, fileName) {

      const link = document.createElement('a')
      link.style.display = 'none'
      link.href = url
      link.download = fileName
      // link.setAttribute('download', fileName)
      document.body.appendChild(link)
      link.click() // a标签自动触发点击事件
      link.remove()
      window.URL.revokeObjectURL(url) // 释放url
    },