downloadFile 下载文件 ​

function downloadFile(url: string, name: string) {
  var fileName = ""
  if (name) {
    fileName = name
  } else {
    const res = url.split("?")[0].split("/")
    fileName = res[res.length - 1]
  }
  var xhr = new XMLHttpRequest()
  xhr.open("GET", url, true)
  xhr.responseType = "blob"
  xhr.onload = function () {
    if (xhr.status === 200) {
      const blob = xhr.response
      const link = document.createElement("a")
      const body = document.querySelector("body")
      link.href = window.URL.createObjectURL(blob)
      link.download = fileName
      link.style.display = "none"
      body?.appendChild(link)
      link.click()
      body?.removeChild(link)
      window.URL.revokeObjectURL(link.href)
    }
  }
  xhr.send()
}