笔记——下载方法

function testExport(fileurls) {

  if (fileurls == "" || typeof fileurls == "unedfined") {

    return;

  }

  var downiframe = document.querySelector("#downiframe");

  if (downiframe) {

    downiframe.parentNode.removeChild(downiframe);

  }

  try {

    var elemIF = document.createElement("iframe");

    elemIF.id = "downiframe";

    elemIF.src = fileurls;

    elemIF.style.display = "none";

    document.body.appendChild(elemIF);

  } catch (e) {

    console.dir("error");

  }

}