js IE window.open()或a标签下载被拦截解决方案

function iframeDownload(url) {
  const iframe = document.createElement('iframe');

  iframe.style.display = 'none';

  function iframeLoad() {
    console.log('iframe onload');

    const win = iframe.contentWindow;

    const doc = win.document;

    if (win.location.href === url) {
      if (doc.body.childNodes.length > 0) {
        // response is error
      }

      iframe.parentNode.removeChild(iframe);
    }
  }

  if ('onload' in iframe) {
    iframe.onload = iframeLoad;
  } else if (iframe.attachEvent) {
    iframe.attachEvent('onload', iframeLoad);
  } else {
    iframe.onreadystatechange = function onreadystatechange() {
      if (iframe.readyState === 'complete') {
        iframeLoad();
      }
    };
  }

  iframe.src = '';

  document.body.appendChild(iframe);

  setTimeout(function loadUrl() {
    iframe.contentWindow.location.href = url;
  }, 50);
}