js模拟点击下载文件到本地

function fake_click(obj) {
  var ev = document.createEvent("MouseEvents");
  ev.initMouseEvent(
    "click", true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null
  );
  obj.dispatchEvent(ev);
}

const blob = new Blob([res.data], { type: res.data.type })
const file = new FileReader()

file.readAsBinaryString(blob)
let filename = this.filename
file.onload = (ev) => {
  const myFileName = `${filename}.${exportType === 'html'
      ? 'zip'
      : exportType === 'word' ? 'doc' : exportType}`

  var urlObject = window.URL || window.webkitURL || window;
  var save_link = document.createElementNS("http://www.w3.org/1999/xhtml", "a")
  save_link.href = urlObject.createObjectURL(blob);
  save_link.download = myFileName;
  this.fake_click(save_link)
  console.log('下载报告')
}